High-speed-impact-resistant double-flow-channel magneto-rheological damper

Abstract

The invention discloses a high-speed-impact-resistant double-flow-channel magnetorheological damper which comprises a double-flow-channel piston assembly component, a cylinder barrel component, a floating piston component and a guider component. The double-flow-channel piston assembly assembly and the piston cylinder barrel assembly are in contact through a guide belt to form coaxial fit and penetrate through the guider assembly to achieve the axial single-degree-of-freedom movement assembly relation in a cylinder barrel. Through the innovative design of the structure and the function, the technical defects that a traditional magnetorheological damper is too large in minimum damping force, low in magnetic field utilization rate, insufficient in adjusting range and the like under the high-speed impact working condition are overcome, the reduced minimum damping force enables a system to achieve faster energy buffering under the instantaneous high-speed impact load effect, and the damping effect of the system is improved. The problem that the counter-acting force generated by a traditional damper due to the fact that the minimum damping force is too large is solved, and the safety and stability of a controlled structure or device are protected.

Description

Technical Field

[0001] The invention relates to a damping device, in particular to a high-speed impact resistant double-flow channel magnetorheological damper. Background Art

[0002] In modern industry and engineering, magnetorheological dampers are widely used in vehicle vibration reduction, engineering structure shock absorption and other systems requiring semi-active control as a highly efficient damping control device. Magnetorheological dampers adjust the damping force through the rheological properties of magnetorheological fluid, can respond quickly to external excitations in a short time, and have the advantages of high response speed, large adjustable range and simple structure. However, when the magnetorheological damper is subjected to instantaneous large displacement or impact load during high-speed impact, the flow velocity of the magnetorheological fluid flowing through the damper increases rapidly. Due to the limited cross-sectional area of ​​the flow channel, the fluid pressure difference increases sharply, causing the minimum damping force to be too large. This excessive minimum damping force may be directly transmitted to the structure or equipment being protected, thereby causing damage to it.

[0003] In the existing technical solutions, the main method used is to expand the cross-sectional area of ​​the flow channel to reduce the minimum damping force under impact conditions. However, this solution will further reduce the utilization rate of the magnetic field inside the flow channel, and even part of the magnetic field will pass through the flow channel axially, thereby invalidating the excitation of part of the magnetic field, thereby reducing the adjustment range of the magnetorheological damper.

[0004] Therefore, in order to solve the above technical problems, it is urgent to propose a new technical means. Summary of the invention

[0005] The object of the present invention is to provide a high-speed impact resistant dual-channel magnetorheological damper to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A high-speed impact resistant dual-channel magnetorheological damper comprises a dual-channel piston assembly, a cylinder assembly, a floating piston assembly and a guide assembly; the dual-channel piston assembly and the piston-cylinder assembly are contacted by a guide belt to form a coaxial fit, and pass through the guide assembly to achieve an axial single-degree-of-freedom motion assembly relationship in the cylinder; the floating piston assembly is also contacted by a guide belt to form a coaxial fit with the piston-cylinder assembly, and is placed below the dual-channel piston assembly to form a gas compensation chamber. The dual-channel piston assembly includes a piston lower end cover, a piston outer tube, a magnetic circuit adjustment assembly, a flat key, a nylon plug, an O-ring A, an O-ring B, a piston core, an external lead, a guide band A, a piston upper end cover, a piston rod, a retaining ring, and a gasket; the piston cylinder assembly includes an outer cylinder, a lifting ear and a bottom end cover; the floating piston assembly includes a floating piston, an O-ring C and a guide band B; the guide assembly includes a guide body, a skeleton oil seal, an O-ring D, an O-ring E, a retaining ring and a buffer block.

[0007] As a preferred solution of the present invention: the top of the piston lower end cover is provided with multiple positioning grooves, and a group of wire grooves and key grooves on the same straight line are provided; the bottom of the piston upper end cover is provided with a positioning groove corresponding to the piston lower end cover, and is placed coaxially with the piston lower end cover; the piston core is coaxially placed in the inner positioning grooves of the piston lower end cover and the piston upper end cover; the O-ring A is placed in the sealing ring groove of the nylon plug, and is coaxially placed inside the piston core.

[0008] As a further preferred embodiment of the present invention: the magnetic circuit regulating component includes a magnetic conductive plate A, a magnetic conductive plate B, a magnetic conductive plate C, a coil frame, an excitation coil and a wire bushing; the magnetic conductive plate A, the magnetic conductive plate B and the magnetic conductive plate C are all provided with positioning grooves, which are coaxially connected through two coil frames and coaxially placed in the outer positioning grooves of the lower end cover of the piston and the upper end cover of the piston. The distance between the inner surface of the magnetic circuit regulating component and the outer surface of the piston core forms an inner annular flow channel, and the distance between the outer surface of the magnetic circuit regulating component and the inner surface of the coaxially placed piston outer cylinder forms an outer annular flow channel; a keyway is provided at the corresponding position of the bottom of the magnetic conductive plate A, and the flat key is placed in the keyway of the lower end cover of the piston and the magnetic conductive plate A; the piston rod, O-ring B, retaining ring, gasket and the upper end cover of the piston are all coaxially connected to the upper end of the piston core.

[0009] As a further preferred embodiment of the present invention: the magnetic conductive plates A and B are provided with wire passing grooves, the wire bushings are placed in the wire passing grooves, the excitation coil is wound on the outer surface of the coil skeleton, its lead wire passes through the wire bushing and the wire passing groove of the lower end cover of the piston, and then is connected to the nylon plug, and is led out through the inner hole of the piston rod via the external lead wire; the wire passing parts of the excitation coil, wire bushing, lower end cover of the piston, and piston core can be encapsulated by epoxy resin coating or injection molding.

[0010] As a further preferred embodiment of the present invention: the inner annular flow channel and the outer annular flow channel can both be used as main flow channels or pressure relief flow channels. The specific determination method can be adjusted according to the ratio of the flow channel cross-sectional areas. Both configuration schemes can reduce the minimum damping force under high-speed impact.

[0011] As a further preferred embodiment of the present invention: a plurality of groups of inner and outer slots are formed on the piston lower end cover and the piston upper end cover, wherein the inner slots correspond to the positions of the inner annular flow channel, and the outer slots correspond to the positions of the outer annular flow channel.

[0012] Compared with the prior art, the present invention has the following beneficial effects: This damper introduces an additional pressure relief channel on the basis of the traditional piston, so that the magnetorheological fluid can be diverted during high-speed impact, thereby increasing the effective cross-sectional area of ​​the channel, reducing the fluid pressure difference, and thus significantly reducing the minimum damping force; and the channel is distributed on both sides of the excitation coil, and a magnetic field can be generated between the two annular channel through the excitation coil, so that the magnetic field acts vertically on the inner and outer channel at the same time, which greatly improves the utilization efficiency of the magnetic field and achieves a larger damping force adjustment range.

[0013] The present invention overcomes the technical defects of traditional magnetorheological dampers such as excessive minimum damping force, low magnetic field utilization and insufficient adjustment range under high-speed impact conditions through innovative structural and functional designs. The reduced minimum damping force enables the system to achieve faster energy buffering under instantaneous high-speed impact loads, avoids the problem of excessive reaction force caused by excessive minimum damping force of traditional dampers, and protects the safety and stability of the controlled structure or equipment. In addition, by arranging the excitation coil between the two annular flow channels, the magnetic field can act vertically on the two flow channels at the same time, effectively improving the utilization of the magnetic field, thereby increasing the adjustable range of the damper to adapt to more complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional axial view of the present invention.

[0015] Figure 2 It is a cross-sectional front view of the present invention.

[0016] Figure 3 It is a top view of the dual-channel piston assembly component of the present invention.

[0017] Figure 4 It is a bottom view of the dual-channel piston assembly component of the present invention.

[0018] Figure 5 It is a cross-sectional view of the dual-channel piston assembly component of the present invention.

[0019] In the figure: lifting ear 1, floating piston 2, piston lower end cover 3, flat key 4, magnetic plate A5, magnetic plate B6, coil skeleton 7, magnetic plate C8, retaining ring 9, piston upper end cover 10, external lead 11, piston rod 12, magnetorheological fluid 13, buffer block 14, skeleton oil seal 15, guide body 16, retaining spring 17, O-ring E18, O-ring D19, outer cylinder 20, gasket 21, O-ring B22, piston core 23, excitation coil 24, guide belt A25, wire bushing 26, O-ring A27, nylon plug 28, piston outer cylinder 29, guide belt B30, O-ring C31, bottom end cover 32. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 indirectly connected 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.

[0023] See also Figure 1 In an embodiment of the present invention, a high-speed impact resistant dual-channel magnetorheological damper includes a dual-channel piston assembly component, a cylinder assembly, a floating piston assembly and a guide assembly.

[0024] The dual-channel piston assembly and the piston-cylinder assembly are contacted with a guide belt to form a coaxial fit, and pass through the guide assembly to realize its axial single-degree-of-freedom motion assembly relationship in the cylinder. The floating piston assembly also contacts with the piston-cylinder assembly with a guide belt to form a coaxial fit, and is placed under the dual-channel piston assembly to form a gas compensation chamber.

[0025] The dual-channel piston assembly includes a piston lower end cover 3, a piston outer cylinder 29, a magnetic circuit adjustment component, a flat key 4, a nylon plug 28, an O-ring A27, an O-ring B22, a piston core 23, an external lead 11, a guide belt A25, a piston upper end cover 10, a piston rod 12, a retaining ring 9, and a gasket 21.

[0026] The piston-cylinder assembly comprises an outer cylinder 20 , a lifting ear 1 and a bottom end cover 32 .

[0027] The floating piston assembly includes a floating piston 2, an O-ring C31 and a guide band B30.

[0028] The guide assembly includes a guide body 16 , a skeleton oil seal 15 , an O-ring D 19 , an O-ring E 18 , a retaining spring 17 and a buffer block 14 .

[0029] like Figure 2 As shown, the top of the piston lower end cover 3 is provided with multiple positioning grooves, which are used as positioning elements, and a group of wire grooves and key grooves on the same straight line are also provided; the bottom of the piston upper end cover 10 is provided with a positioning groove corresponding to the piston lower end cover 3, and is coaxially placed with the piston lower end cover 3; the piston core 23 is coaxially placed in the inner positioning grooves of the piston lower end cover 3 and the piston upper end cover 10; the O-ring A27 is placed in the sealing ring groove of the nylon plug 28, and is coaxially placed inside the piston core 23, thereby preventing the magnetorheological fluid 13 from being sprayed from the inner hole of the piston rod 12.

[0030] Further, such as Figure 3-5As shown, the magnetic circuit adjustment component includes a magnetic plate A5, a magnetic plate B6, a magnetic plate C8, a coil frame 7, an excitation coil 24 and a wire bushing 26, wherein the coil frame 7 and the wire bushing 26 are made of reverse magnetic material to reduce magnetic circuit loss; the magnetic plates A5, B6 and C8 are all provided with positioning grooves, which are coaxially connected through two coil frames 7 and coaxially placed in the outer positioning grooves of the piston lower end cover 3 and the piston upper end cover 10; the inner surface of the magnetic circuit adjustment component is connected to the piston core 23 The spacing between the outer surfaces forms an inner annular flow channel, and the spacing between the outer surface of the magnetic circuit adjustment component and the inner surface of the coaxially placed piston outer tube 29 forms an outer annular flow channel; a keyway is provided at the corresponding position of the bottom of the magnetic conductive plate A5, and the flat key 4 is placed in the keyway of the piston lower end cover and the magnetic conductive plate A5 to prevent the magnetic circuit adjustment component from rotating and cutting the lead in the wire groove; the piston rod 12, O-ring B22, retaining ring 9, gasket 21 and piston upper end cover 10 are all coaxially connected to the upper end of the piston core 23.

[0031] Specifically, the magnetic conductive plates A5 and B6 are provided with wire passing grooves, the wire bushings 26 are placed in the wire passing grooves, the excitation coil 24 is wound on the outer surface of the coil skeleton 7, and its lead wire passes through the wire bushing 26 and through the wire passing groove of the piston lower end cover 3, and then is connected to the nylon plug 28, and is led out through the inner hole of the piston rod 12 via the external lead wire 11; the wire passing parts of the excitation coil 24, the wire bushing 26, the piston lower end cover 3, and the piston core 23 can be encapsulated by epoxy resin coating or injection molding to prevent the magnetorheological fluid 13 from penetrating into the inner cavity and causing a short circuit.

[0032] At the same time, the inner annular flow channel and the outer annular flow channel can both be used as the main flow channel or the pressure relief flow channel. The specific determination method can be adjusted according to the ratio of the flow channel cross-sectional area. Both configuration schemes can reduce the minimum damping force under high-speed impact. Among them, the adjustment range of using the inner flow channel as the main flow channel will be larger because the magnetic induction intensity inside the coil will be higher than that on the outside.

[0033] Furthermore, the piston lower end cover 3 and the piston upper end cover 10 are provided with a plurality of groups of inner and outer slots, the inner slots corresponding to the positions of the inner annular flow channels, and the outer slots corresponding to the positions of the outer annular flow channels; the piston lower end cover 3 and the piston upper end cover 10 are both made of reverse magnetic materials, so the function of the slots is only to provide an inlet and outlet for the magnetorheological fluid 13 to enter and exit the inner and outer double flow channels, and the influence on the magnetic circuit and the adjustment range is extremely small, so the cross-sectional area of ​​the slots should be expanded as much as possible to further reduce the minimum damping force.

[0034] like Figure 2When the device is working, during the reciprocating motion of the piston assembly, the magnetorheological fluid 13 will flow through the two annular flow channels due to the pressure difference, so that the magnetorheological fluid 13 can be diverted during the high-speed impact process, thereby increasing the effective cross-sectional area of ​​the flow channel, reducing the fluid pressure difference, and thus significantly reducing the minimum damping force; and when the excitation coil 24 applies an excitation current, the magnetic field will simultaneously vertically pass through the inner and outer annular flow channels, changing the rheological properties of the magnetorheological fluid 13 in the flow channel, thereby improving the utilization rate of the magnetic field while achieving a larger adjustment range.

[0035] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0036] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high-speed impact resistant dual-channel magnetorheological damper, characterized in that: It includes a dual-flow-channel piston assembly, a cylinder assembly, a floating piston assembly and a guide assembly; The dual-channel piston assembly and the piston-cylinder assembly are in contact with each other through a guide belt to form a coaxial fit, and pass through the guide assembly to achieve an axial single-degree-of-freedom motion assembly relationship in the cylinder. The floating piston assembly is also in contact with the piston-cylinder assembly through a guide belt to form a coaxial fit, and is placed below the dual-channel piston assembly to form a gas compensation chamber. The dual-channel piston assembly comprises a piston lower end cover (3), a piston outer cylinder (29), a magnetic circuit adjustment assembly, a flat key (4), a nylon plug (28), an O-ring A (27), an O-ring B (22), a piston core (23), an external lead (11), a guide belt A (25), a piston upper end cover (10), a piston rod (12), a retaining ring (9), and a cushion block (21); The piston-cylinder assembly comprises an outer cylinder (20), a lifting lug (1) and a bottom end cover (32); The floating piston assembly comprises a floating piston (2), an O-ring C (31) and a guide belt B (30); The guide assembly comprises a guide body (16), a skeleton oil seal (15), an O-ring D (19), an O-ring E (18), a retaining spring (17) and a buffer block (14).

2. The high-speed impact resistant dual-channel magnetorheological damper according to claim 1, characterized in that: The top of the piston lower end cover (3) is provided with a plurality of positioning grooves, which serve as positioning elements, and a group of wire grooves and key grooves on the same straight line are also provided; the bottom of the piston upper end cover (10) is provided with a positioning groove corresponding to the piston lower end cover (3), and is coaxially placed with the piston lower end cover (3); the piston core (23) is coaxially placed in the inner positioning grooves of the piston lower end cover (3) and the piston upper end cover (10); the O-ring A (27) is placed in the sealing ring groove of the nylon plug (28), and is coaxially placed inside the piston core (23), thereby preventing the magnetorheological fluid (13) from being sprayed from the inner hole of the piston rod (12).

3. The high-speed impact resistant dual-channel magnetorheological damper according to claim 2, characterized in that: The magnetic circuit adjustment component comprises a magnetic plate A (5), a magnetic plate B (6), a magnetic plate C (8), a coil frame (7), an excitation coil (24) and a wire bushing (26), wherein the coil frame (7) and the wire bushing (26) are made of reverse magnetic material to reduce magnetic circuit loss; the magnetic plate A (5), the magnetic plate B (6) and the magnetic plate C (8) are all provided with positioning grooves, which are coaxially connected through two coil frames (7) and coaxially placed in the outer positioning grooves of the piston lower end cover (3) and the piston upper end cover (10); the inner surface of the magnetic circuit adjustment component is aligned with the piston core ( 23) The spacing between the outer surfaces forms an inner annular flow channel, and the spacing between the outer surface of the magnetic circuit regulating component and the inner surface of the coaxially placed piston outer tube (29) forms an outer annular flow channel; a keyway is provided at a corresponding position on the bottom of the magnetic conductive plate A (5), and the flat key (4) is placed in the keyway of the piston lower end cover and the magnetic conductive plate A (5) to prevent the magnetic circuit regulating component from rotating and cutting the lead wire in the wire groove; the piston rod (12), O-ring B (22), retaining ring (9), gasket (21) and piston upper end cover (10) are all coaxially connected to the upper end of the piston core (23).

4. The high-speed impact resistant dual-channel magnetorheological damper according to claim 3 is characterized in that: The magnetic conductive plates A (5) and B (6) are provided with wire grooves, the wire bushings (26) are placed in the wire grooves, the excitation coil (24) is wound on the outer surface of the coil frame (7), the lead wires pass through the wire bushings (26) and through the wire grooves of the piston lower end cover (3), and then are connected to the nylon plug (28), and are led out through the inner hole of the piston rod (12) via the external lead wire (11); the wire passing parts of the excitation coil (24), the wire bushing (26), the piston lower end cover (3), and the piston core (23) are encapsulated by epoxy resin coating or injection molding.

5. The high-speed impact resistant dual-channel magnetorheological damper according to claim 4, characterized in that: The inner annular flow channel and the outer annular flow channel can both be used as main flow channels or pressure relief flow channels.

6. The high-speed impact resistant dual-channel magnetorheological damper according to claim 5, characterized in that: The piston lower end cover (3) and the piston upper end cover (10) are provided with a plurality of groups of inner and outer slots, wherein the inner slots correspond to the positions of the inner annular flow channel, and the outer slots correspond to the positions of the outer annular flow channel; the piston lower end cover (3) and the piston upper end cover (10) are both made of reverse magnetic material.

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