Double-cylinder magnetorheological damper

Abstract

The utility model discloses a double-cylinder type magnetorheological damper, and particularly relates to the technical field of dampers, the double-cylinder type magnetorheological damper comprises an outer cylinder, an inner cylinder, an upper end cover, a lower end cover, a piston rod, a piston and magnetorheological fluid, the outer cylinder is sleeved outside the inner cylinder, the outer cylinder and the inner cylinder are arranged between the upper end cover and the lower end cover, one end of the piston rod is fixedly provided with a movable lug ring, and the other end of the piston rod is fixedly provided with a movable lug ring. The other end of the piston rod penetrates through the upper end cover and is fixedly connected with the piston, and the piston and the inner wall of the inner cylinder are sealed and are in sliding fit. According to the double-barrel type magnetorheological damper, the electromagnetic coil is arranged outside the outer barrel, an external electromagnetic coil structure is formed, heat dissipation of the electromagnetic coil is facilitated, meanwhile, when the coil goes wrong and needs to be maintained, only the locking electromagnetic coil needs to be driven by a wrench to rotate to be away from the sealing cover, and then the electromagnetic coil is locked. And then the electromagnetic coil installed in the magnetism isolating sleeve can be taken out for maintenance by taking off the sealing cover, other structures of the damper do not need to be disassembled, and maintenance is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of dampers, in particular to a double-tube magnetorheological damper. Background Art

[0002] Magnetorheological fluid is a controllable fluid and is a relatively active research area in smart materials. Magnetorheological damper is a semi-active damping device, which is made based on the principle that the flow properties of magnetorheological fluid change under the action of a magnetic field. It has the advantages of fast response speed, wide adjustment range, and large output damping force. It is an excellent semi-active vibration reduction device. At present, it has been widely used in the field of structural vibration reduction of ships, artillery, vehicles, etc.

[0003] Most common magnetorheological dampers are made by winding an electromagnetic coil around a piston head, and then forming a closed magnetic circuit on the piston head or between the piston head and the cylinder. When power is turned on, a magnetic field perpendicular to the flow direction of the magnetorheological fluid is generated in the damping channel of the piston head or the damping channel between the piston head and the cylinder. By changing the magnitude of the current, the shear yield stress of the magnetorheological fluid in the damping channel can be changed, thereby increasing the damping force. However, most of these dampers have many defects. Since the electromagnetic coil of this type of damper works in the magnetorheological fluid, a large amount of heat will be generated when the electromagnetic coil is working, which will affect the working performance of the magnetorheological fluid and the service life of the electromagnetic coil. When there is a problem with the electromagnetic coil during the use of the rheological damper, it will cause difficulties in maintenance, because many sealing systems of the damper must be opened, which brings inconvenience to maintenance. Utility Model Content

[0004] The main purpose of the utility model is to provide a double-tube magnetorheological damper, which can effectively solve the problems in the background technology.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A double-tube magnetorheological damper comprises an outer tube, an inner tube, an upper end cover, a lower end cover, a piston rod, a piston and a magnetorheological fluid, wherein the outer tube is sleeved on the outside of the inner tube, and the outer tube and the inner tube are installed between the upper end cover and the lower end cover, a movable earring is fixedly installed on one end of the piston rod, the other end of the piston rod passes through the upper end cover and is fixedly connected to the piston, the piston is sealed with the inner wall of the inner tube and slidably matched, a damping channel for the flow of magnetorheological fluid is arranged between the outer tube and the inner tube, a fixed earring is fixedly installed on the bottom of the lower end cover, a radial second flow hole is arranged on the inner wall of the inner tube near the upper end cover, and a A first radial flow hole is provided, and magnetorheological fluid flows between the inner cavity of the inner cylinder and the damping channel through the first flow hole and the second flow hole. A magnetic isolation sleeve is provided on the outer surface of the outer cylinder, and an opening is provided on the upper end of the magnetic isolation sleeve. An electromagnetic coil is installed between the inner cavity of the magnetic isolation sleeve and the outer wall of the outer cylinder, and a sealing cover is provided on the upper end of the magnetic isolation sleeve. The wire of the electromagnetic coil passes through the magnetic isolation sleeve and is led to the outside. A thread is provided on the outer surface of the outer cylinder, and a part of the thread is located in the magnetic isolation sleeve. A locking screw ring is threadedly connected to the thread, and the locking screw ring is located above the sealing cover. A nut polygonal flange for clamping with a wrench is provided on the outer periphery of the locking screw ring.

[0007] Preferably, a first dynamic sealing ring is provided on the outer surface of the piston, a second dynamic sealing ring is provided between the outer surface of the piston rod and the upper end cover, and static sealing rings are provided between the inner cylinder and the upper end cover and the lower end cover.

[0008] Preferably, four of the first circulation holes and four of the second circulation holes are arranged and are evenly distributed in the circumferential direction of the outer surface of the inner cylinder.

[0009] Preferably, the magnetorheological fluid is silicone oil.

[0010] Preferably, the width of the damping channel is 0.3 mm-5 mm.

[0011] Preferably, the outer walls of the upper end cover and the lower end cover are threadedly connected to the inner wall of the outer cylinder.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The utility model discloses a double-tube magnetorheological damper, which forms an external electromagnetic coil structure by arranging the electromagnetic coil outside the outer tube, which is beneficial to the heat dissipation of the electromagnetic coil. At the same time, when the coil has a problem and needs to be repaired, it is only necessary to use a wrench to drive the locking screw ring to rotate away from the cover, and then remove the cover to take out the electromagnetic coil installed in the magnetic isolation sleeve for repair, without disassembling other structures of the damper, and the maintenance is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1It is a structural schematic diagram of the utility model from a first perspective;

[0015] Figure 2 It is a cross-sectional view of the utility model;

[0016] Figure 3 This is a schematic diagram of the magnetic isolation sleeve of the utility model in an open state;

[0017] Figure 4 It is a structural schematic diagram of another cross-sectional view of the utility model;

[0018] Figure 5 For the utility model Figure 2 Sectional view at AA in the middle;

[0019] Figure 6 For the utility model Figure 2 Cross-sectional view at the middle BB.

[0020] In the figure: 1. outer cylinder; 2. inner cylinder; 3. upper end cover; 4. lower end cover; 5. piston rod; 6. piston; 7. movable earring; 8. fixed earring; 9. magnetic isolation sleeve; 10. sealing cover; 11. electromagnetic coil; 12. locking screw ring; 13. wire; 14. static sealing ring; 15. first dynamic sealing ring; 16. second dynamic sealing ring; 17. damping channel; 18. magnetorheological fluid; 21. first flow hole; 22. second flow hole; 101. thread. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0022] like Figure 1-6As shown, a double-tube magnetorheological damper includes an outer tube 1, an inner tube 2, an upper end cover 3, a lower end cover 4, a piston rod 5, a piston 6 and a magnetorheological fluid 18. The outer tube 1 is sleeved on the outside of the inner tube 2, and the outer tube 1 and the inner tube 2 are installed between the upper end cover 3 and the lower end cover 4. A movable earring 7 is fixedly installed on one end of the piston rod 5, and the other end of the piston rod 5 passes through the upper end cover 3 and is fixedly connected to the piston 6. The piston 6 is sealed with the inner wall of the inner tube 2 and is slidably matched. A damping channel 1 for the flow of the magnetorheological fluid 18 is provided between the outer tube 1 and the inner tube 2. 7. A fixing earring 8 is fixedly installed at the bottom of the lower end cover 4. A radial second flow hole 22 is arranged at the inner wall of the inner cylinder 2 near the upper end cover 3. A radial first flow hole 21 is arranged at the inner wall of the inner cylinder 2 near the lower end cover 4. The magnetorheological fluid 18 flows between the inner cavity of the inner cylinder 2 and the damping channel 17 through the first flow hole 21 and the second flow hole 22. A magnetic isolation sleeve 9 is sleeved on the outer surface of the outer cylinder 1. An opening is arranged at the upper end of the magnetic isolation sleeve 9. An electromagnetic coil 11 is installed between the inner cavity of the magnetic isolation sleeve 9 and the outer wall of the outer cylinder 1 to generate an electromagnetic field. By controlling the magnitude of the current loaded on the electromagnetic coil, the magnitude of the magnetic field strength is controlled, thereby changing the damping characteristics of the magnetorheological fluid 18. A cover 10 is provided at the upper end of the magnetic isolation sleeve 9. The wire 13 of the electromagnetic coil 11 passes through the magnetic isolation sleeve 9 and is led to the outside. A thread 101 is provided on the outer surface of the outer cylinder 1, and a part of the thread 101 is located in the magnetic isolation sleeve 9. A locking screw 12 is threadedly connected to the thread 101. The locking screw 12 is located above the cover 10. The cover 10 is squeezed by the locking screw 12 so that the cover 10 It is sealed with the magnetic isolation sleeve 9, and a nut polygonal flange for clamping with a wrench is provided on the outer periphery of the locking screw ring 12. The electromagnetic coil 11 is located outside the outer cylinder 1 to form an external coil structure, which is beneficial to the heat dissipation of the electromagnetic coil 11. At the same time, when the coil has a problem and needs maintenance, the locking screw ring 12 is driven to rotate by a wrench, thereby driving the locking screw ring 12 away from the cover 10. The cover 10 can be removed to take out the electromagnetic coil 11 installed in the magnetic isolation sleeve 9 for maintenance. There is no need to disassemble other structures of the damper, and maintenance is convenient.

[0023] A first dynamic seal 15 is provided on the outer surface of the piston 6, a second dynamic seal 16 is provided between the outer surface of the piston rod 5 and the upper end cover 3, and static seals 14 are provided between the inner tube 2 and the upper end cover 3 and the lower end cover 4 to ensure the sealing effect of the entire damper.

[0024] Four first flow holes 21 and four second flow holes 22 are provided, which are evenly distributed in the circumferential direction of the outer surface of the inner cylinder 2, so that the distribution of the damping adjustment is more uniform and more stable during operation.

[0025] The outer walls of the upper end cover and the lower end cover are threadedly connected to the inner wall of the outer cylinder.

[0026] The working principle of the utility model is as follows: by arranging the electromagnetic coil 11 outside the outer cylinder 1, an external electromagnetic coil structure is formed, which is beneficial to the heat dissipation of the electromagnetic coil 11. At the same time, when the electromagnetic coil 11 has a problem and needs to be repaired, the locking screw ring 12 is driven to rotate by a wrench, thereby driving the locking screw ring 12 away from the cover 10. By removing the cover 10, the electromagnetic coil 11 installed in the magnetic isolation sleeve 9 can be taken out for maintenance, without disassembling other structures of the damper, and maintenance is convenient. When the damper is working, when the reciprocating external force pushes the piston 6, the magnetorheological fluid 18 at both ends of the piston 6 will reciprocate between the damping channel 17 and the inner tube 2 through the first flow hole 21 and the second flow hole 22. The electromagnetic coil 11 generates an electromagnetic field after the external current is connected. The electromagnetic field acts on the magnetorheological fluid 18 inside the damping channel 17, changing the damping characteristics of the magnetorheological fluid 18, thereby controlling the damping output of the damper. By controlling the current loaded on the electromagnetic coil 11, the magnitude of the magnetic field strength is controlled, thereby changing the damping characteristics of the magnetorheological fluid 18.

[0027] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A double-tube magnetorheological damper, comprising an outer tube (1), an inner tube (2), an upper end cover (3), a lower end cover (4), a piston rod (5), a piston (6) and a magnetorheological fluid (18), wherein the outer tube (1) is sleeved on the outside of the inner tube (2), and the outer tube (1) and the inner tube (2) are installed between the upper end cover (3) and the lower end cover (4), a movable earring (7) is fixedly installed on one end of the piston rod (5), the other end of the piston rod (5) passes through the upper end cover (3) and is fixedly connected to the piston (6), the piston (6) is sealed and slidably matched with the inner wall of the inner tube (2), a damping channel (17) for the flow of the magnetorheological fluid (18) is provided between the outer tube (1) and the inner tube (2), and a fixed earring (8) is fixedly installed on the bottom of the lower end cover (4), characterized in that: A radial second flow hole (22) is provided on the inner wall of the inner cylinder (2) near the upper end cover (3), and a radial first flow hole (21) is provided on the inner wall of the inner cylinder (2) near the lower end cover (4). The magnetorheological fluid (18) flows between the inner cavity of the inner cylinder (2) and the damping channel (17) through the first flow hole (21) and the second flow hole (22). A magnetic isolation sleeve (9) is sleeved on the outer surface of the outer cylinder (1). An opening is provided at the upper end of the magnetic isolation sleeve (9). A magnetic isolation sleeve (9) is installed between the inner cavity of the magnetic isolation sleeve (9) and the outer wall of the outer cylinder (1). An electromagnetic coil (11) is provided, a cover (10) is arranged at the upper end of the magnetic isolation sleeve (9), a wire (13) of the electromagnetic coil (11) passes through the magnetic isolation sleeve (9) and is led to the outside, a thread (101) is provided on the outer surface of the outer cylinder (1), and a part of the thread (101) is located in the magnetic isolation sleeve (9), a locking screw ring (12) is threadedly connected to the thread (101), the locking screw ring (12) is located above the cover (10), and a nut polygonal flange for clamping with a wrench is provided on the outer periphery of the locking screw ring (12).

2. A double-tube magnetorheological damper according to claim 1, characterized in that: A first dynamic seal ring (15) is arranged on the outer surface of the piston (6), a second dynamic seal ring (16) is arranged between the outer surface of the piston rod (5) and the upper end cover (3), and static seal rings (14) are arranged between the inner tube (2) and the upper end cover (3) and the lower end cover (4).

3. A double-tube magnetorheological damper according to claim 1, characterized in that: Four of the first circulation holes (21) and four of the second circulation holes (22) are arranged and are evenly distributed in the circumferential direction of the outer surface of the inner cylinder (2).

4. A double-tube magnetorheological damper according to claim 1, characterized in that: The magnetorheological fluid (18) is silicone oil.

5. A double-tube magnetorheological damper according to claim 1, characterized in that: The width of the damping channel is 0.3 mm-5 mm.

6. A double-tube magnetorheological damper according to claim 1, characterized in that: The outer walls of the upper end cover (3) and the lower end cover (4) are threadedly connected to the inner wall of the outer cylinder (1).

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