A dual-ring channel hybrid magnetorheological damper

Abstract

This invention provides a dual-annular channel hybrid magnetorheological damper. The damper includes a cylinder assembly, a piston assembly, and a valve assembly. The piston assembly forms a rod-side chamber and a rodless chamber within the cylinder assembly. The valve assembly is fixed to the bottom of the cylinder assembly and spaced apart from the piston assembly. A third channel is provided within the valve assembly. The valve assembly includes an inner magnetic ring, a permanent magnet, a first magnetic isolation ring, a large magnetic ring, a first magnetic sleeve, a second magnetic isolation ring, a valve sleeve, a coil, a third magnetic isolation ring, a second magnetic sleeve, a valve core, and a third end cap. The valve sleeve is fitted over the inner magnetic ring and connected to the third end caps at both ends. This invention solves the problems of narrow amplitude adjustment range, lack of failure protection, and frictional wear in traditional magnetorheological damping devices.

Description

Technical Field

[0001] This invention relates to the field of damper technology, and in particular to a dual-annular channel hybrid magnetorheological damper valve. Background Technology

[0002] Magnetorheological fluids are a novel type of smart material. Without an external magnetic field, they exhibit excellent fluid flow. When a magnetic field is applied, the fluid can transform into a viscoelastic solid within milliseconds, and this process is reversible, controllable, and rapid. Magnetorheological dampers utilize this characteristic, varying the output damping force by different input currents. The magnitude and adjustable range of the damping force are important indicators of their performance.

[0003] For example, the existing patent publication number CN108591345B discloses a double-walled magnetorheological damper with high magnetic field utilization. Compared with the traditional piston-type magnetorheological damper, it transforms the moving magnetic coil into a fixed valve structure that meets the piston stroke requirements, thus greatly improving the magnetic field utilization. However, it requires the use of magnetic and non-magnetic materials to create a winding path on the fixed valve, making assembly complex, and the coil is wound around the outer end of the cylinder wall, increasing the overall structure volume.

[0004] For example, the existing patent publication number CN109611498B discloses a bottom-mounted dual-channel dual-cylinder anti-settlement magnetorheological damper, which can control the damping channels separately and provide independent damping characteristics; however, the effective area of ​​its damping channels is small, so the range of damping force provided is limited and there is no failure protection device. Summary of the Invention

[0005] The purpose of this invention is to provide a dual-ring channel hybrid magnetorheological damper valve that can solve the problems of narrow amplitude adjustment range, lack of failure protection and friction wear of traditional magnetorheological damping devices.

[0006] The technical solution of the present invention is: a dual-annular channel hybrid magnetorheological damper includes a cylinder assembly, a piston assembly and a valve assembly reciprocating within the cylinder assembly, wherein the piston assembly forms a rod-shaped chamber and a rodless chamber in the cylinder assembly, and the valve assembly is fixed to the bottom of the cylinder assembly and spaced apart from the piston assembly;

[0007] The valve body assembly is fixed to the bottom of the cylinder assembly and spaced apart from the piston assembly; the cylinder assembly has a third channel inside;

[0008] The valve body assembly includes an inner magnetic ring, a permanent magnet, a first magnetic isolation ring, a large magnetic ring, a first magnetic sleeve, a second magnetic isolation ring, a valve body sleeve, a coil, a third magnetic isolation ring, a second magnetic sleeve, a valve core, and a third end cap. Two third end caps are symmetrically arranged. The valve core is located in the middle between the two third end caps. The coil is wound around the outer surface of the valve core. The first and second magnetic sleeves are located on the outer periphery of the valve core, and the second magnetic isolation ring is embedded inside the first and second magnetic sleeves, contacting the coil. The third magnetic isolation ring, which is in contact with the outer surface of the second magnetic isolation ring, is located between the first and second magnetic sleeves. The large magnetic ring is located outside the valve core and embedded... The large magnetic ring and the valve core are spaced apart to form a first channel inside the third end caps at both ends; the inner magnetic ring is fitted outside the large magnetic ring and spaced apart to form a second channel; multiple inner magnetic rings are spaced apart along the axial direction of the valve core, and a permanent magnet is sandwiched between two adjacent inner magnetic rings, with the first magnetic isolation ring disposed on the side of the permanent magnet near the second channel; the third end cap near the piston assembly has a first opening, and the third end cap on the other side has a second opening, the first channel and the second channel are respectively connected to the first opening and the second opening, the first opening is connected to the rodless cavity, and the second opening is connected to the rodless cavity, the third channel and the rod cavity in sequence;

[0009] The valve body sleeve is fitted outside the inner magnetic ring and connected to the third end caps at both ends.

[0010] In the above scheme, the valve body assembly in a traditional damper is placed at the bottom of the cylinder assembly, making it a fixed valve that does not reciprocate with the piston assembly, thereby reducing friction and wear between the valve body assembly and the inner wall of the cylinder assembly. Furthermore, the valve body assembly uses a hybrid magnetization system of coils and permanent magnets, so even if the coil fails, the permanent magnets can still provide fail-safe protection. The valve body assembly also features a double-ring damping channel, with the first channel independently controlled by the coil and the second channel independently controlled by the permanent magnet. Changing the current magnitude alters the magnetic field strength of the coil, thus changing the flow path of the magnetorheological fluid and ultimately altering the damping force.

[0011] Preferably, the coil is wound around the valve core in an embedded manner, effectively reducing the overall size of the structure.

[0012] Preferably, the valve body assembly further includes a buffer retaining ring, a spring, and a retaining ring disposed near the rod chamber, with the retaining ring, spring, and buffer retaining ring sequentially arranged starting from the outer surface of the third end cover. This effectively buffers the impact force of the piston assembly.

[0013] Preferably, the cylinder assembly includes a support base disposed at the end of the rodless chamber, and the valve body assembly is fixed to the side of the support base.

[0014] Preferably, the cylinder assembly further includes a first end cap, an outer cylinder, an inner cylinder, and a second end cap. The first end cap and the second end cap are respectively disposed at both ends of the outer cylinder. The inner cylinder is fitted into the outer cylinder, and both ends of the inner cylinder are respectively connected to the first end cap and the second end cap. The piston assembly and the valve body assembly are both disposed in the inner cylinder, and the piston assembly passes through the first end cap. The support base is disposed adjacent to the second end cap. The outer cylinder and the inner cylinder form the third channel. The inner cylinder is provided with a third port communicating with the rodless chamber and the third channel, and a fourth port communicating with the rod chamber and the third channel.

[0015] Preferably, the valve body assembly divides the rodless chamber into a first rodless chamber and a second rodless chamber, the first rodless chamber being located close to the piston rod assembly, the third port communicating with the second rodless chamber, and the fourth port communicating with the first rodless chamber.

[0016] Preferably, the support base and the second end cap are spaced apart, and the space is filled with gas to compensate for changes in the volume of the rodless cavity.

[0017] Preferably, the cylinder assembly is filled with magnetorheological fluid.

[0018] Compared with related technologies, the beneficial effects of the present invention are as follows:

[0019] I. The dual-ring channel hybrid magnetoresistive valve-type magnetoresistive damper described above can solve the problems of narrow amplitude adjustment range, lack of failure protection, and friction and wear of traditional magnetoresistive damping devices.

[0020] Second, by placing the valve body at the bottom to create a fixed valve, friction and wear between the piston head and the inside of the cylinder are reduced;

[0021] Third, by employing a double-ring channel and a hybrid magnetization method within the valve body, the two fluid flow channels are independently controlled by a permanent magnet and a coil, respectively. This means that the magnetic field strength of the coil can be changed by altering the current, thereby changing the flow path of the magnetorheological fluid and thus its damping force. Compared to traditional magnetorheological dampers, this invention has a better adjustable range of damping force, is simple to operate, and has great practicality. Furthermore, the permanent magnet can provide failure protection in the event of coil failure. Attached Figure Description

[0022] Figure 1 A cross-sectional structural schematic diagram of the dual-annular channel hybrid magnetoelectric type valve-type magnetorheological damper provided by the present invention.

[0023] Figure 2 for Figure 1 A detailed structural diagram of the valve body assembly.

[0024] In the attached diagram: 1. Piston rod; 2. First end cap; 3. First screw; 4. Outer cylinder; 5. Inner cylinder; 6. First O-ring seal; 7. Buffer retaining ring; 8. Spring; 9. Retaining ring; 10. Inner magnetic ring; 11. Permanent magnet; 12. First magnetic isolation ring; 13. Large magnetic ring; 14. Second screw; 15. Support base; 16. Second end cap; 17. First magnetic collar; 18. Second magnetic isolation ring; 19. Valve body sleeve; 20. Coil; 1. Third magnetic isolation ring; 22. Second magnetic conductive collar; 23. Valve core; 24. Third end cap; 25. Third screw; 26. Piston head; 27. Magnetorheological fluid; 28. Second O-ring seal; 29. ​​Third O-ring seal; 30. First channel; 31. Second channel; 32. First port; 33. Second port; 34. Third channel; 35. Third port; 36. Fourth port; 37. First rodless chamber; 38. Second rodless chamber; 39. Gas. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" used below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0026] like Figure 1 As shown, this embodiment provides a dual-annular channel hybrid magnetorheological damper with valve-type magnetorheological fluid, comprising a cylinder assembly, a piston assembly reciprocating within the cylinder assembly, and a valve assembly disposed within the cylinder assembly. The piston assembly forms a rod-shaped chamber and a rodless chamber within the cylinder assembly. The cylinder assembly is filled with magnetorheological fluid 27.

[0027] like Figure 1 , Figure 2 As shown, the valve body assembly includes a buffer retaining ring 7, a spring 8, a retaining ring 9, an inner magnetic ring 10, a permanent magnet 11, a first magnetic isolation ring 12, a large magnetic ring 13, a first magnetic collar 17, a second magnetic isolation ring 18, a valve body sleeve 19, a coil 20, a third magnetic isolation ring 21, a second magnetic collar 22, a valve core 23, and a third end cap 24.

[0028] Two third end caps 24 are symmetrically arranged. A valve core 23 is positioned in the middle between the two third end caps 24, and the coil 20 is wound around the outer surface of the valve core 23. The coil 20 is wound around the valve core 23 in an embedded manner. A first magnetically conductive collar 17 and a second magnetically conductive collar 22 are disposed on the outer periphery of the valve core 23, and a second magnetically insulating ring 18 is embedded inside the first magnetically conductive collar 17 and the second magnetically conductive collar 22, and the second magnetically insulating ring 18 is in contact with the coil 20. A third magnetically insulating ring 21, which is in contact with the outer surface of the second magnetically insulating ring 18, is disposed between the first magnetically conductive collar 17 and the second magnetically conductive collar 22.

[0029] The large magnetic ring 13 is located outside the valve core 23 and is embedded in the third end caps 24 at both ends. The valve core 23 has a T-shaped cross-section, and the second magnetic ring 22 is close to the head of the T-shape and flush with the outer surface of the head of the T-shape. The T-shape of the valve core 23 is located close to the piston rod assembly, and the head of the T-shape is connected to the third end cap 24 by a third screw 25. The outer surfaces of the first magnetic ring 17 and the second magnetic ring 22 are flush. The flush outer surfaces and the large magnetic ring 13 are spaced apart to form a first channel 30. The inner magnetic ring 10 is fitted outside the large magnetic ring 13, and the inner magnetic ring 10 and the large magnetic ring 13 are spaced apart to form a second channel 31.

[0030] Multiple inner magnetic rings 10 are arranged at intervals along the axial direction of the valve core 23. A permanent magnet 11 is sandwiched between two adjacent inner magnetic rings 10. The first magnetic isolation ring 12 is arranged on the side of the permanent magnet 11 near the second channel 31.

[0031] The cylinder assembly includes a first end cap 2, an outer cylinder 4, an inner cylinder 5, a support base 15, and a second end cap 16. The first end cap 2 and the second end cap 16 are respectively disposed at both ends of the outer cylinder 4 and fixed by a first screw 3. The inner cylinder 5 is fitted inside the outer cylinder 4, and both ends of the inner cylinder 5 are connected to the first end cap 2 and the second end cap 16 respectively. A second O-ring 28 is provided between the inner cylinder 5 and the first end cap 2, between the inner cylinder 5 and the second end cap 16, and between the inner cylinder 5 and the support base 15.

[0032] The piston assembly includes a piston rod 1 and a piston head 26 mounted at the end of the piston rod 1. The piston rod 1 mates with a first end cap 2, and a third O-ring 29 is provided between the piston rod 1 and the first end cap 2. The piston head 26 reciprocates within the inner cylinder 5, and a first O-ring 6 is provided between the piston head 26 and the inner cylinder 5, the first O-ring 6 preventing communication between the rod chamber and the rodless chamber.

[0033] The valve body sleeve 19 is fitted onto the outside of the inner magnetic ring 10 and connected to the third end caps 24 at both ends by second screws 14. The valve body assembly is fitted inside the inner cylinder 5, and a second O-ring seal 28 is provided between the valve body sleeve 19 and the inner cylinder 5. The valve body assembly is fixed to the side of the support base 15. The support base 15 is spaced apart from the second end cap 16, and the space is filled with a gas 39 for compensating for changes in the volume of the rodless chamber. This gas 39 can be nitrogen. The valve body assembly divides the rodless chamber into a first rodless chamber 37 and a second rodless chamber 38. The first rodless chamber 37 is located between the valve body assembly and the piston head 26. The second rodless chamber 38 is located between the valve body assembly and the support base 15.

[0034] A third channel 34 is formed between the outer cylinder 4 and the inner cylinder 5. The inner cylinder 5 is provided with a third port 35 that communicates with the second rodless cavity 38 and the third channel 34. The inner cylinder 5 is provided with a fourth port 36 that communicates with the rod cavity and the third channel 34.

[0035] The third end cap 24 near the piston assembly has a first port 32 communicating with the first rodless cavity 37, and the third end cap 24 on the other side has a second port 33 communicating with the second rodless cavity 38. The first channel 30 and the second channel 31 communicate with the first port 32 and the second port 33, respectively.

[0036] Both the first channel 30 and the second channel 31 are annular damping channels. The first channel 30 is independently controlled by the coil 20, and the second channel 31 is independently controlled by the permanent magnet 11. The magnetic field of the coil 20 can be changed by changing the current, thereby changing the flow path of the magnetorheological fluid.

[0037] The first flow path: When the piston rod assembly extends and the current is increased at the same time, the magnetorheological fluid passes through the first rodless cavity 37, the first port 32, the second channel 31, the second port 33, the second rodless cavity 38, the third port 35, the third channel 34, the fourth port 36 and returns to the rod cavity.

[0038] The second flow path: When the piston rod assembly retracts, the current magnitude is the same as that in the first flow path. The magnetorheological fluid sequentially enters the first rodless cavity 37 through the rod cavity, the fourth port 36, the third channel 34, the third port 35, the second rodless cavity 38, the second port 33, the second channel 31, and the first port 32.

[0039] The third flow path: When the piston rod assembly extends and the current is reduced at the same time, the magnetorheological fluid passes through the first rodless cavity 37, the first port 32, the first channel 30, the second port 33, the second rodless cavity 38, the third port 35, the third channel 34, the fourth port 36 in sequence and returns to the rod cavity.

[0040] The fourth flow path: When the piston rod assembly retracts, the current magnitude is the same as that in the third flow path. The magnetorheological fluid then flows sequentially through the rod cavity, the fourth port 36, the third channel 34, the third port 35, the second rodless cavity 38, the second port 33, the first channel 30, and the first port 32 into the first rodless cavity 37.

[0041] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A dual-annular channel hybrid magnetorheological damper, comprising a cylinder assembly and a piston assembly reciprocating within the cylinder assembly, wherein the piston assembly forms a rod-shaped chamber and a rodless chamber within the cylinder assembly, characterized in that, It also includes a valve body assembly, which is fixed to the bottom of the cylinder assembly and spaced apart from the piston assembly; the cylinder assembly has a third channel (34). The valve body assembly includes an inner magnetic ring (10), a permanent magnet (11), a first magnetic isolation ring (12), a large magnetic ring (13), a first magnetic collar (17), a second magnetic isolation ring (18), a valve body sleeve (19), a coil (20), a third magnetic isolation ring (21), a second magnetic collar (22), a valve core (23), and a third end cap (24). Two third end caps (24) are symmetrically arranged, and the valve core (23) is located in the middle between the two third end caps (24). The outer surface of the valve core (23)... The coil (20) is wound around the valve core (23). The first magnetic collar (17) and the second magnetic collar (22) are disposed on the outer periphery of the valve core (23), and a second magnetic shielding ring (18) is embedded inside the first magnetic collar (17) and the second magnetic collar (22). The second magnetic shielding ring (18) is in contact with the coil (20). A third magnetic shielding ring (21) is disposed between the first magnetic collar (17) and the second magnetic collar (22) and is in contact with the outer surface of the second magnetic shielding ring (18). The large magnetic collar (13) is located at the valve core (23). The core (23) is externally mounted and embedded in the third end caps (24) at both ends. The large magnetic ring (13) and the valve core (23) are spaced apart to form a first channel (30). The inner magnetic ring (10) is fitted outside the large magnetic ring (13), and the inner magnetic ring (10) and the large magnetic ring (13) are spaced apart to form a second channel (31). Multiple inner magnetic rings (10) are spaced apart along the axial direction of the valve core (23), and a permanent magnet is sandwiched between two adjacent inner magnetic rings (10). 11) The permanent magnet (11) is provided with the first magnetic isolation ring (12) on the side near the second channel (31); the third end cap (24) near the piston assembly is provided with a first port (32), and the third end cap (24) on the other side is provided with a second port (33). The first channel (30) and the second channel (31) are respectively connected to the first port (32) and the second port (33). The first port (32) is connected to the rodless cavity, and the second port (33) is connected to the rodless cavity, the third channel and the rod cavity in sequence. The valve body sleeve (19) is fitted outside the inner magnetic ring (10) and connected to the third end caps (24) at both ends; the first channel (30) and the second channel (31) are both annular damping channels, the first channel (30) is independently controlled by the coil (20), and the second channel (31) is independently controlled by the permanent magnet (11); The magnetic field of the coil (20) is changed by changing the current, thereby changing the flow path of the magnetorheological fluid.

2. The dual-annular channel hybrid magnetorheological damper according to claim 1, characterized in that, The coil (20) is wound around the valve core (23) in an embedded manner.

3. The dual-annular channel hybrid magnetorheological damper of claim 1, characterized in that, The valve body assembly also includes a buffer retaining ring (7), a spring (8) and a retaining ring (9) disposed near the rod chamber, and the retaining ring (9), spring (8) and buffer retaining ring (7) are disposed sequentially from the outer surface of the third end cover (24).

4. The dual-annular channel hybrid magnetorheological damper of claim 1, characterized in that, The cylinder assembly includes a support base (15) disposed at the end of the rodless chamber, and the valve body assembly is fixed to the side of the support base (15).

5. The dual-annular channel hybrid magnetorheological damper according to claim 4, characterized in that, The cylinder assembly further includes a first end cap (2), an outer cylinder (4), an inner cylinder (5), and a second end cap (16). The first end cap (2) and the second end cap (16) are respectively disposed at both ends of the outer cylinder (4). The inner cylinder (5) is fitted inside the outer cylinder (4), and both ends of the inner cylinder (5) are respectively connected to the first end cap (2) and the second end cap (16). The piston assembly and the valve assembly are both disposed inside the inner cylinder (5), and the piston assembly passes through the first end cap (2). The support base (15) is disposed adjacent to the second end cap (16). The third channel (34) is formed between the outer cylinder (4) and the inner cylinder (5). The inner cylinder (5) is provided with a third port (35) communicating with the rodless cavity and the third channel (34) and a fourth port (36) communicating with the rod cavity and the third channel (34).

6. The dual-annular channel hybrid magnetorheological damper according to claim 5, characterized in that, The valve body assembly divides the rodless chamber into a first rodless chamber (37) and a second rodless chamber (38). The first rodless chamber (37) is located close to the piston rod assembly. The third port (35) is connected to the second rodless chamber (38), and the fourth port (36) is connected to the first rodless chamber (37).

7. The dual-annular channel hybrid magnetorheological damper according to claim 5, characterized in that, The support base (15) is spaced apart from the second end cap (16), and the space is filled with gas (39) to compensate for changes in the volume of the rodless cavity.

8. The dual-annular channel hybrid magnetorheological damper according to claim 1, characterized in that, The cylinder assembly is filled with magnetorheological fluid (27).

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