Parallel viscous magneto-rheological damper

Abstract

The application discloses a parallel viscous magneto-rheological damper, which comprises an outer cylinder, an inner cylinder, a piston, an electromagnetic assembly and a piston rod, the electromagnetic assembly comprises a magnetic core which is arranged at the middle part of the piston rod and whose outer surface is arranged along the circumference of the piston rod, a first groove is arranged on the inner side of the magnetic core along the length direction of the piston rod, a second groove is arranged on the outer side of the magnetic core along the length direction of the piston rod, a through groove is arranged on the side surface of the two ends of the magnetic core and is connected with the first groove and the second groove, the through groove, the first groove and the second groove form a rectangular groove, and a rectangular wire coil is wound in the through groove, the first groove and the second groove one by one. The damping force of the application is provided by the viscous damping force of viscous liquid and the shear yield force generated by the cutting of magnetic induction lines of magneto-rheological liquid, even if the external power supply or control system fails, the magneto-rheological liquid loses the energy dissipation capacity due to the small shear yield force, the viscous liquid of the device can still normally dissipate energy and provide damping force, and therefore the device has high reliability.

Description

Technical Field

[0001] The invention belongs to the technical field of building structure vibration reduction, and particularly relates to a parallel viscous magnetorheological damper. Background Art

[0002] Viscous dampers are important vibration control devices with advantages including simple structure, stable performance, and long life. Their structure, consisting of a hydraulic system, mechanical structure, and moving parts, is easy to manufacture and maintain. Due to the linear nature of the liquid's viscous resistance, viscous dampers offer relatively stable frequency response and low-temperature performance. Wear on mechanical components and seals is relatively minimal, allowing them to operate over a wide temperature range and find widespread application in civil and mechanical engineering. However, because liquid viscous dampers significantly restrict the motion and vibration of powertrains and motion control systems, they may not provide sufficient control and precise adjustment in some applications, resulting in suboptimal vibration control.

[0003] Magnetorheological dampers are semi-active control devices that exploit the rapid fluid-solid inversion properties of magnetorheological fluid (MRF) in a magnetic field. They offer advantages such as fast response, low energy consumption, and continuously adjustable damping force. The damping force of a MR damper is primarily regulated by the current flowing through the coil. However, under earthquakes, the MR damper's external power supply or control system is highly susceptible to damage. If this fails, the MR damper completely loses its energy dissipation and vibration damping function, requiring further improvement in its reliability. Furthermore, due to the high cost of MR fluid, the cost of a larger MR damper increases significantly. Summary of the Invention

[0004] In order to solve the above problems, the present invention proposes a parallel viscous magnetorheological damper.

[0005] The parallel viscous magnetorheological damper of the present invention comprises an outer cylinder, an inner cylinder, a piston and a piston rod, wherein both ends of the outer cylinder are sealed by a cylinder cover plate, the inner cylinder is located inside the outer cylinder, and a viscous damping gap is left between the inner cylinder and the outer cylinder; an electromagnetic assembly is arranged inside the piston, and a viscous liquid is located between the outer cylinder, the cylinder cover plate, the piston baffle, the inner cylinder and the piston rod; the magnetorheological fluid is located in the damping gap between the piston and the electromagnetic assembly, and is characterized in that the piston is composed of two piston baffles fixed to the piston rod on the inner side of the inner cylinder, the electromagnetic assembly includes a magnetic core located in the middle part of the piston rod and having an outer surface arranged along the circumference of the piston rod, a first groove is provided on the inner side of the magnetic core along the length direction of the piston rod, and a second groove is provided on the outer side of the magnetic core along the length direction of the piston rod, and a through groove connecting the first groove and the second groove is opened on the side surfaces of both ends of the magnetic core, the through groove and the first groove and the second groove form a rectangular groove, and rectangular electric coils are wound in the through groove, the first groove and the second groove in a one-to-one correspondence.

[0006] Circular grooves are arranged at intervals on the inner side of the magnetic core along the length direction of the piston rod, and the circular grooves are arranged along the circumference of the piston rod. A first O-type sealing ring is arranged in the circular groove.

[0007] The plurality of first grooves and the plurality of second grooves are arranged at intervals along the circumference of the piston rod, and the plurality of first grooves and the plurality of second grooves correspond to each other one by one.

[0008] A wear-resistant electric coil protective layer is provided on the outer periphery of the rectangular electric coil and the inner side of the magnetic core.

[0009] The cross-section of the magnetic core is annular, and multiple magnetorheological fluid damping gaps are arranged along the circumference of the outer circumference of the magnetic core. The depth of the magnetorheological fluid damping gap is less than the ring width of the magnetic core. The rectangular electric coils and the magnetorheological fluid damping gaps are arranged alternately. The number of rectangular electric coils is equal to the number of magnetorheological fluid damping gaps, and the magnetorheological fluid damping gap is located in the middle of two adjacent rectangular electric coils.

[0010] A long convex positioning strip is provided on the inner side of the middle of the inner cylinder to match the magnetorheological fluid damping gap. The convex positioning strip connects the magnetic core and the inner cylinder together. The length and width of the convex positioning strip match the length and width of the damping gap.

[0011] Both ends of the inner cylinder extend outward beyond the piston baffle to form a plurality of positioning blocks, and the positioning blocks continue to extend into the cylinder cover plate. Communication holes are provided between the plurality of positioning blocks, and the communication holes are spaced apart from the positioning blocks.

[0012] The piston rod and the internal cylinder, piston baffle, and cylinder cover plate form closed chambers a and b. Chambers a, b, connecting holes, and viscous damping gaps are filled with viscous liquid, and the viscous liquid flows back and forth in chambers a and b through the connecting holes and viscous damping gaps.

[0013] The piston rod, piston baffle, internal cylinder, and electromagnetic assembly form annular closed chambers c and d. Chambers c, d, and the magnetorheological fluid damping gap are filled with magnetorheological fluid. The magnetorheological fluid flows back and forth in chambers c and d through the magnetorheological fluid damping gap. The viscous damping gap is located on the periphery of the magnetorheological damping gap, and the two form a parallel structure.

[0014] The beneficial effect of the present invention is that the damping force of the present application is jointly provided by the viscous damping force of the viscous liquid and the shear yield force generated by the magnetorheological fluid cutting the magnetic flux lines. It is a parallel structure. The shear yield force generated by the magnetorheological fluid cutting the magnetic flux lines can be adjusted by changing the current intensity in the coil. Therefore, the damping force of the device of the present application is large, the energy dissipation capacity is strong, and the damping force is continuously adjustable within a large range, which can better suppress the response of civil engineering structures under large earthquakes; even if the external power supply or control system fails, the magnetorheological fluid loses its energy dissipation capacity due to the small shear yield force, and the viscous liquid of the device can still consume energy and provide damping force normally, so it has high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a longitudinal cross-sectional view of the position of the electric coil of the present invention.

[0016] Figure 2 It is a longitudinal cross-sectional view of the damping gap position of the magnetorheological fluid of the present invention.

[0017] Figure 3 yes Figure 1 Middle AA section view.

[0018] Figure 4 yes Figure 1 Middle BB cross-section.

[0019] Figure 5 yes Figure 1 Cross-section of the CC.

[0020] Figure 6 yes Figure 1 Middle DD cross-section.

[0021] Figure 7 yes Figure 1 Middle EE cross-section.

[0022] Figure 8 This is the schematic diagram of the magnetic circuit structure ( Figure 1 middle DD section position).

[0023] Figure 9 It is a schematic structural diagram of the magnetic core of the present invention.

[0024] Reference numerals:

[0025] Piston rod 1; piston 2; first sealing ring 21; second sealing ring 22; magnetic core 3; annular groove 31; first groove 32; magnetorheological fluid damping gap 33; second groove 34; through groove 35; internal cylinder 4; convex positioning strip 41; connecting hole 42; positioning block 43; rectangular electric coil 5; wear-resistant electric coil protective layer 51; magnetic flux lines 52; viscous damping gap 6; external cylinder 7; cylinder cover plate 8. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0027] like Figures 1-9 As shown, the parallel viscous magnetorheological damper of the present invention includes: an outer cylinder 7, an inner cylinder 4, a piston 2, an electromagnetic assembly, a piston rod 1, a viscous liquid and a magnetorheological fluid. The two ends of the outer cylinder 7 are sealed by a cylinder cover plate 8. The inner cylinder 4 is located inside the outer cylinder 7, and a viscous damping gap 6 is left between the inner cylinder 4 and the outer cylinder 7. The piston 2 is composed of the inner wall of the inner cylinder 4 and two piston baffles. The piston rod 1 is fixedly connected to the two piston baffles, that is, the piston rod 1 can drive the two piston baffles to move. The electromagnetic assembly is located inside the piston 2. The piston rod 1 passes through the cylinder cover plate 8, the piston 2 and the electromagnetic assembly in sequence from the center from the outside to the inside, and both ends pass through the center of the cylinder cover plate 8. The central axes of the outer cylinder 7, the inner cylinder 4, the piston rod 1, the cylinder cover plate 8, the piston 2 and the electromagnetic assembly coincide. The viscous liquid is located between the outer cylinder 7, the cylinder cover plate 8, the piston baffle and the inner cylinder 4. The magnetorheological fluid is located inside the piston 2 and in the electromagnetic assembly. The electromagnetic assembly includes a magnetic core 3, a rectangular coil 5, and a wear-resistant coil protective layer 51. The magnetic core 3 has a circular cross-section and is located in the middle of the piston rod 1, with its outer surface circumferentially extending along the piston rod 1. Annular grooves 31 are spaced along the inner side of the magnetic core 3 along the length of the piston rod 1. These grooves 31 are circumferentially arranged along the piston rod 1, and contain first O-rings 21. Multiple annular grooves 31 and first sealing rings 21 are provided to provide a seal.

[0028] A first sealing ring 21 is also provided between the cylinder cover plate 8 and the piston rod 1, thereby preventing leakage when the piston rod 1 and the cylinder cover plate 8 move relative to each other. A second sealing ring 22 is provided between the piston baffle and the inner cylinder 4, thereby preventing leakage when the piston baffle and the inner cylinder 4 move relative to each other.

[0029] A first groove 32 is provided on the inner side of the magnetic core 3 along the length direction of the piston rod 1, and a second groove 34 is provided on the outer side of the magnetic core 3 along the length direction of the piston rod 1. Multiple first grooves 32 and multiple second grooves 34 are arranged at intervals along the circumference of the piston rod 1, and the multiple first grooves 32 and multiple second grooves 34 correspond to each other one by one.

[0030] The side surfaces at both ends of the magnetic core 3 are provided with through grooves 35 connecting the first groove 32 and the second groove 34. The through grooves 35, the first groove 32 and the second groove 34 form a rectangular groove. Rectangular electric coils 5 are wound in the through grooves 35, the first groove 32 and the second groove 34 in a one-to-one correspondence. A wear-resistant electric coil protective layer 51 is provided on the outer periphery of the rectangular electric coil 5 and the inner side of the magnetic core 3.

[0031] Multiple MR fluid damping gaps 33 are circumferentially arranged around the outer circumference of the magnetic core 3. The depth of these gaps 33 is less than the width of the core 3. Rectangular coils 5 and MR fluid damping gaps 33 are alternately arranged. The number of rectangular coils 5 is equal to the number of MR fluid damping gaps 33, and each MR fluid damping gap 33 is located directly between two adjacent rectangular coils 5. The MR fluid damping gaps 33 are designed to facilitate the passage of MR fluid through the magnetic core 3.

[0032] A long convex positioning strip 41 is provided on the inner side of the middle part of the internal cylinder 4, which matches the magnetorheological fluid damping gap 33. The convex positioning strip 41 connects the magnetic core 3 and the internal cylinder 4 together. The length and width of the convex positioning strip 41 are matched with the length and width of the magnetorheological fluid damping gap 33.

[0033] Both ends of the internal cylinder 4 extend outward beyond the piston baffle 8 to form multiple positioning blocks 43, and the positioning blocks 43 continue to extend into the cylinder cover plate 8. Connecting holes 42 are set between the multiple positioning blocks 43, and the connecting holes 42 are spaced apart from the positioning blocks 43.

[0034] The piston rod 1, the internal cylinder 4, the piston baffle, and the cylinder cover 8 form closed chambers a and b. Chambers a and b are connected by a communication hole 42 and a viscous damping gap 6. Chambers a, b, the communication hole 42, and the viscous damping gap 6 are filled with a viscous liquid, which flows back and forth between chambers a and b through the communication hole 42 and the viscous damping gap 6.

[0035] The piston rod 1 is connected to the piston baffle, the internal cylinder 4, and the electromagnetic assembly to form annular closed chambers c and d. Chambers c and d are connected by a magnetorheological fluid damping gap 33. Chambers c, d, and the magnetorheological fluid damping gap 33 are filled with magnetorheological fluid, which cuts through the magnetic flux lines through the magnetorheological fluid damping gap 33 and flows back into chambers c and d.

[0036] The viscous damping gap 6 is located on the periphery of the magnetorheological fluid damping gap 33 , and the two form a parallel structure.

[0037] When the parallel viscous magnetorheological damper of the present invention is used, one end of the piston rod 1 is fixed to the top of a certain floor of the building structure, and the external cylinder 7 is fixed to the bottom of the floor. Under the action of horizontal seismic load, the building structure will produce relative displacement between floors, and the relative displacement between floors will be converted into axial displacement between the piston rod 1 and the external cylinder 7.

[0038] Since the piston rod 1 and the piston 2 are fixed together, the outer cylinder 7, the cylinder cover plate 8, the inner cylinder 4 and the electromagnetic assembly are fixed together, the displacement between the piston rod 1 and the outer cylinder 7 is converted into the axial displacement between the piston rod 1 and the inner cylinder 4, between the piston 2 and the cylinder cover plate 8, and between the piston 2 and the electromagnetic assembly. At this time, taking the outer cylinder 7 as an example and the piston rod 1 moving to the left, the piston rod 1 drives the piston 2 to move to the left, the cylinder cover plate 8, the inner cylinder 4 and the electromagnetic assembly remain stationary, and the viscous liquid in the chamber a passes through The connecting hole 42 and the viscous damping gap 6 flow into the chamber b, and the viscous liquid moves in the viscous damping gap 6 to generate resistance; at the same time, the magnetorheological fluid in the chamber d flows into the chamber c through the magnetorheological fluid damping gap 33 inside the electromagnetic component, and the magnetorheological fluid generates a shear yield force in the magnetorheological fluid damping gap 33, thereby simultaneously generating parallel damping forces in the axial directions of the outer and inner peripheries of the internal cylinder 4, thereby effectively consuming the seismic energy transmitted into the building structure, reducing the dynamic response of the structure under the action of seismic loads, and increasing the energy consumption capacity of the structure.

[0039] The ends of the conductor of the rectangular electric coil 5 of the present invention are connected to the positive and negative poles of a DC power supply, respectively. When current flows through the rectangular electric coil 5, annular magnetic flux lines 52 are generated around the piston rod 1 within the magnetic core 3 and the magnetorheological fluid damping gap 33 within the rectangular electric coil. The direction of flow of the magnetorheological fluid is perpendicular to the flux lines 52. Due to the excellent magnetic conductivity of the magnetic core 3, the magnetic flux lines 52 generated after the electric coil 5 is energized are concentrated in the magnetic core 3 and the magnetorheological fluid damping gap 33. Therefore, the magnitude of the flux lines 52 can effectively change the shear yield strength of the magnetorheological fluid, which means that the magnitude of the damping force of the present invention can be changed by changing the magnitude of the current. Even if the external power supply fails and the damping force provided by the magnetorheological fluid is very small, the present invention can still rely on the viscous fluid to provide damping force and energy dissipation capacity. The two do not interfere with each other, and it is a parallel device, thus having high reliability.

[0040] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, 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 should not be understood as limiting the present invention.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0042] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0043] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0044] In the present invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" mean 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification, as well as features of different embodiments or examples, unless they are mutually inconsistent.

[0045] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present invention.

Claims

1. A parallel viscous magnetorheological damper, comprising an outer cylinder, an inner cylinder, a piston, and a piston rod, wherein both ends of the outer cylinder are sealed by a cylinder cover plate, the inner cylinder is located inside the outer cylinder, and a viscous damping gap is left between the inner cylinder and the outer cylinder; an electromagnetic assembly is provided inside the piston, and a viscous liquid is located between the outer cylinder, the cylinder cover plate, the piston baffle, the inner cylinder, and the piston rod; and a magnetorheological fluid is located in the damping gap between the piston and the electromagnetic assembly, characterized in that: The piston is composed of two piston baffles fixed on the piston rod on the inner side of the internal cylinder. The electromagnetic assembly includes a magnetic core located in the middle part of the piston rod and with the outer surface arranged along the circumference of the piston rod. A first groove is arranged on the inner side of the magnetic core along the length direction of the piston rod, and a second groove is arranged on the outer side of the magnetic core along the length direction of the piston rod. Through grooves connecting the first groove and the second groove are opened on the side surfaces at both ends of the magnetic core. The through groove forms a rectangular groove with the first groove and the second groove. Rectangular electric coils are wound in the through groove, the first groove and the second groove in a one-to-one correspondence.

2. The parallel viscous magnetorheological damper according to claim 1, characterized in that: Circular grooves are arranged at intervals on the inner side of the magnetic core along the length direction of the piston rod, and the circular grooves are arranged along the circumference of the piston rod. A first sealing ring is arranged in the circular groove.

3. The parallel viscous magnetorheological damper according to claim 2, characterized in that: The plurality of first grooves and the plurality of second grooves are arranged at intervals along the circumferential direction of the magnetic core, and the plurality of first grooves and the plurality of second grooves correspond to each other one by one.

4. The parallel viscous magnetorheological damper according to claim 3, characterized in that: A wear-resistant electric coil protective layer is provided on the outer periphery of the rectangular electric coil and the inner side of the magnetic core.

5. The parallel viscous magnetorheological damper according to claim 4, characterized in that: The cross-section of the magnetic core is annular, and multiple magnetorheological fluid damping gaps are arranged along the circumference of the outer circumference of the magnetic core. The depth of the magnetorheological fluid damping gap is less than the ring width of the magnetic core. The rectangular electric coils and the magnetorheological fluid damping gaps are arranged alternately. The number of rectangular electric coils is equal to the number of magnetorheological fluid damping gaps, and the magnetorheological fluid damping gap is located in the middle of two adjacent rectangular electric coils.

6. The parallel viscous magnetorheological damper according to claim 5, characterized in that: A long convex positioning strip is provided on the inner side of the middle portion of the inner cylinder, which is matched with the damping gap of the magnetorheological fluid. The convex positioning strip connects the magnetic core and the inner cylinder together.

7. The parallel viscous magnetorheological damper according to claim 1, characterized in that: Both ends of the inner cylinder extend outward beyond the piston baffle to form a plurality of positioning blocks, and the positioning blocks continue to extend into the cylinder cover plate. Communication holes are provided between the plurality of positioning blocks, and the communication holes are spaced apart from the positioning blocks.

8. The parallel viscous magnetorheological damper according to claim 7, characterized in that: The piston rod and the internal cylinder, piston baffle, and cylinder cover plate form closed chambers a and b. Chambers a, b, the connecting hole, and the viscous damping gap are filled with viscous liquid, and the viscous liquid flows back and forth in chambers a and b through the connecting hole and the viscous damping gap.

9. The parallel viscous magnetorheological damper according to claim 4, characterized in that: The piston rod, piston baffle, internal cylinder, and electromagnetic assembly form annular closed chambers c and d. Chambers c, d, and the magnetorheological fluid damping gap are filled with magnetorheological fluid. The magnetorheological fluid flows back and forth in chambers c and d through the magnetorheological fluid damping gap. The viscous damping gap is located on the periphery of the magnetorheological damping gap, and the two form a parallel structure.

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