阅读说明：本技术 一种拉伸大于压缩阻尼力的防沉淀磁流变阻尼器 (Anti-precipitation magnetorheological damper with stretching force larger than compression damping force ) 是由 董龙雷 严健 马琳婕 周嘉明 严亚亚 吴有福 于 2019-09-23 设计创作，主要内容包括：本发明公开了一种拉伸大于压缩阻尼力的防沉淀磁流变阻尼器,阻尼器缸筒的外缸筒套装在内缸筒上,外缸筒和内缸筒的顶部设置有缸筒上端盖,底部设置有缸筒下端盖,内缸筒内设置有活塞杆,活塞杆的活塞头处沿圆周面等距分布多个防沉淀结构,活塞头与缸筒下端盖之间的内缸筒内设置有缸筒下腔盖,缸筒下腔盖上设置有多个防沉淀结构,阻尼发生器上设置有阻尼发生器出液口和阻尼发生器进液口,阻尼发生器进液口与外缸筒的顶部连通；阻尼发生器出液口与外缸筒的底部连通。本发明结构简单,活塞行程大,磁场利用率高,增大了磁流变阻尼力,提高了失电安全性,通过防沉淀结构使得拉伸阻尼力大于压缩阻尼力,且具有防沉淀的功效。(The invention discloses an anti-precipitation magnetorheological damper with stretching larger than compression damping force, wherein an outer cylinder barrel of a damper cylinder barrel is sleeved on an inner cylinder barrel, the top parts of the outer cylinder barrel and the inner cylinder barrel are provided with cylinder barrel upper end covers, the bottom part of the outer cylinder barrel and the inner cylinder barrel is provided with a cylinder barrel lower end cover, a piston rod is arranged in the inner cylinder barrel, a plurality of anti-precipitation structures are distributed at the piston head of the piston rod at equal intervals along the circumferential surface, a cylinder barrel lower cavity cover is arranged in the inner cylinder barrel between the piston head and the cylinder barrel lower end cover, the cylinder barrel lower cavity cover is provided with a plurality of anti-precipitation structures, a damping generator liquid outlet and a damping generator liquid inlet are arranged on the; the liquid outlet of the damping generator is communicated with the bottom of the outer cylinder barrel. The invention has simple structure, large piston stroke and high magnetic field utilization rate, increases the magneto-rheological damping force, improves the power-off safety, ensures that the tensile damping force is greater than the compressive damping force through the anti-precipitation structure, and has the anti-precipitation effect.)

1. The anti-precipitation magnetorheological damper with the stretching force larger than the compression damping force is characterized by comprising a damper cylinder barrel and a damping generator, wherein the damper cylinder barrel comprises an outer cylinder barrel (4) and an inner cylinder barrel (5), the outer cylinder barrel (4) is sleeved on the inner cylinder barrel (5), a cylinder barrel upper end cover (2) is arranged at the top of the outer cylinder barrel (4) and the top of the inner cylinder barrel (5), a cylinder barrel lower end cover (10) is arranged at the bottom of the outer cylinder barrel, a piston rod (3) is arranged in the inner cylinder barrel (5), a plurality of anti-precipitation structures (6) are distributed at the piston head of the piston rod (3) along the circumference at equal intervals, a cylinder barrel lower cavity cover (8) is arranged in the inner cylinder barrel (5) between the piston head and the cylinder barrel lower end cover (10), a plurality of anti-precipitation structures (6) are arranged on the cylinder barrel lower cavity cover (8), and a damping generator liquid outlet, the liquid inlet (16) of the damping generator is communicated with the top of the outer cylinder barrel (4) through a high-pressure hose (29); the liquid outlet (15) of the damping generator is communicated with the bottom of the outer cylinder barrel (4) through another high-pressure hose (29).

2. The anti-precipitation magnetorheological damper with the tension greater than the compression damping force according to claim 1, wherein a circular through hole is formed in the center of the cylinder barrel upper end cover (2), one end of the piston rod (3) penetrates through the circular through hole and extends out of the cylinder barrel upper end cover, the extending end is connected with the piston rod upper lug ring (1) through threads, and a sealing ring (7) is arranged between the cylinder barrel upper end cover (2) and the piston rod (3); an upper cylinder liquid outlet (12) is arranged on the outer cylinder (4) corresponding to the upper end cover (2) of the cylinder, and the upper cylinder liquid outlet (12) is connected with a damping generator liquid inlet (16) through a high-pressure hose (29); a cylinder barrel lower liquid inlet (14) is formed in the position, corresponding to the inner cylinder barrel (5) and the cylinder barrel lower end cover (10), of the outer cylinder barrel (4), and the cylinder barrel lower liquid inlet (14) is connected with a damping generator liquid outlet (15) through another high-pressure hose (29); the lower end of the cylinder barrel lower end cover (10) is provided with a lower lug seat (11); the outer cylinder barrel (4) is also provided with a nitrogen inflation inlet (13), and the outer cylinder barrel (4) is in sealing connection with the nitrogen inflation inlet (13) through threads.

3. The anti-precipitation magnetorheological damper with the stretching force greater than the compression damping force according to claim 2, wherein the clearance fit is respectively arranged between the cylinder lower cavity cover (8) and the inner cylinder (5), between the cylinder lower end cover (10) and the outer cylinder (4), between the cylinder lower end cover (10) and the inner cylinder (5), between the outer cylinder (4) and the inner cylinder (5), between the cylinder upper end cover (2) and the outer cylinder (4) and between the piston head and the inner cylinder (5); sealing rings (7) are respectively arranged between the cylinder barrel lower end cover (10) and the outer cylinder barrel (4), between the cylinder barrel lower end cover (10) and the inner cylinder barrel (5), between the outer cylinder barrel (4) and the inner cylinder barrel (5), between the cylinder barrel upper end cover (2) and the outer cylinder barrel (4) and between the piston head and the inner cylinder barrel (5).

4. The anti-settling magnetorheological damper with tension greater than the compression damping force as claimed in claim 1, wherein the piston head is provided with at least four anti-settling structures (6), the cylinder lower chamber cover (8) is provided with at least five anti-settling structures (6), one of the anti-settling structures is arranged at the center of the cylinder lower chamber cover (8), and the remaining four anti-settling structures are arranged at equal distance from the center of the cylinder lower chamber cover.

5. The anti-settling magnetorheological damper with the tension larger than the compression damping force according to claim 4, wherein the anti-settling structure (6) comprises a sleeve A, a structure B and a steel ball C, the steel ball C is arranged between the sleeve A and the structure B, the sleeve A and the structure B are in threaded connection or welded connection, through holes are formed in the periphery and the upper surface of the sleeve A, the structure B is provided with a tapered channel, a sealing ring (7) is respectively arranged between the sleeve A and the piston head or the cylinder barrel lower cavity cover (8), and the sleeve A and the piston head or the cylinder barrel lower cavity cover (8) are in threaded connection.

6. The anti-settling magnetorheological damper with the tension greater than the compression damping force according to claim 1, wherein six lower cavity and inner cylinder wall connectors (9) are arranged between the periphery of the joint of the cylinder barrel lower end cover (10) and the cylinder barrel lower cavity cover (8) and the inner cylinder barrel (5), and the six lower cavity and inner cylinder wall connectors (9) are connected with the bottom end between the inner cylinder barrel (5) and the outer cylinder barrel (4); the upper end face of the cylinder barrel lower end cover (10) is a conical opening, the cylinder barrel lower end cover (10) is connected with the cylinder barrel lower cavity cover (8) through threads, the upper faces of six through holes on the periphery of the connecting face of the cylinder barrel lower end cover (10) and the cylinder barrel lower cavity cover (8) are tangent to the lower face of the cylinder barrel lower cavity cover (8), and the lower faces of the six through holes are tangent to the upper end of the conical opening on the upper end face of the cylinder barrel lower end cover (10).

7. The anti-settling magnetorheological damper with the tension greater than the compression damping force according to claim 1, wherein the damping generator comprises a first damping generator cylinder wall (21), a second damping generator cylinder wall (22) and a third damping generator cylinder wall (24), a coil (23) is sleeved on the third damping generator cylinder wall (24), the third damping generator cylinder wall (24) is sleeved in the second damping generator cylinder wall (22), the second damping generator cylinder wall (22) is sleeved in the first damping generator cylinder wall (21), a first damping generator upper end cover (17) is arranged at the upper end of the first damping generator cylinder wall (21), a second damping generator lower end cover (28) is arranged at the lower end of the first damping generator cylinder wall (22), a second damping generator upper end cover (18) is arranged at the upper end of the second damping generator cylinder wall (22), and a first damping generator lower end cover (27) is arranged at the lower end of the second damping generator cylinder wall, a liquid flow pipe (26) is arranged on the lower end cover (27) of the first damping generator; two groups of first disks (19) and second disks (20) are sequentially and alternately arranged in the third damping generator cylinder wall (24) from top to bottom to form a circulation channel, and the damping generator liquid inlet (16) is connected with the damping generator liquid outlet (15) through a radial circulation channel, a liquid flow pipe (26), a second damping generator upper end cover (18), an annular channel between a first damping generator lower end cover (27) and the first damping generator cylinder wall (21).

8. The anti-settling magnetorheological damper with the tension greater than the compressive damping force according to claim 7, wherein a plurality of through holes are circumferentially arranged on each of the two first disks (19) at intervals, a through hole is formed in each of the centers of the two second disks (20) for circulation, and the magnetorheological fluid enters from the damping generator liquid inlet (16), sequentially passes through the through holes circumferentially arranged on the first disk (19), the through hole formed in the center of the first disk (20), the through hole circumferentially arranged on the second disk (19) and the through hole formed in the center of the second disk (20), then passes through the liquid flowing pipe (26), and then passes through the annular channel between the second damping generator upper end cover (18) and the first damping generator lower end cover (27) and the first damping generator cylinder wall (21), and then flows out from the damping generator liquid outlet (15).

9. An anti-settling magnetorheological damper with greater tension than compression damping force according to claim 7, wherein the first disc (19) and the second disc (20) are connected by a copper screw (25), and the lower end cap (27) of the first damping generator and the second disc (20) are connected by a copper screw (25); between the first disc (19) and the third damping generator cylinder wall (24), between the second disc (20) and the third damping generator cylinder wall (24), between the first damping generator upper end cover (17) and the first damping generator cylinder wall (21), between the second damping generator upper end cover (18) and the second damping generator cylinder wall (22), clearance fit is formed between the third damping generator cylinder wall (24) and the second damping generator upper end cover (18), between the first damping generator lower end cover (27) and the third damping generator cylinder wall (24), between the first damping generator lower end cover (27) and the second damping generator cylinder wall (22), between the first damping generator lower end cover (27) and the second damping generator lower end cover (28) and between the second damping generator lower end cover (28) and the first damping generator cylinder wall (21);

sealing rings (7) are respectively arranged between the upper end cover (17) of the first damping generator and the cylinder wall (21) of the first damping generator, between the upper end cover (18) of the second damping generator and the cylinder wall (22) of the second damping generator, between the upper end cover (17) of the first damping generator and the upper end cover (18) of the second damping generator, between the lower end cover (27) of the first damping generator and the cylinder wall (24) of the third damping generator, between the lower end cover (27) of the first damping generator and the cylinder wall (22) of the second damping generator, between the lower end cover (27) of the first damping generator and the lower end cover (28) of the second damping generator, between the lower end cover (28) of the second damping generator and the cylinder wall (21) of the first damping generator and between the cylinder wall (24) of the third damping generator and the upper end cover (18) of the second damping generator.

10. The anti-settling magnetorheological damper with greater tension than compression damping force according to claim 7, wherein the first damping generator upper end cap (17), the second damping generator lower end cap (28), the second damping generator cylindrical wall (22) and the third damping generator cylindrical wall (24) are made of copper material; the upper end cover (18) of the second damping generator, the first disc (19), the second disc (20), the cylinder wall (21) of the first damping generator and the lower end cover (27) of the first damping generator are made of carbon steel materials.

Technical Field

The invention belongs to the technical field of magnetorheological dampers, and particularly relates to an anti-precipitation magnetorheological damper with tension larger than compression damping force.

Background

The magnetorheological fluid belongs to controllable fluid, and is an intelligent material with wide application and excellent performance because the rheology is instantaneous and reversible under the action of a magnetic field and the shear yield strength after the rheology has a stable corresponding relation with the magnetic field strength. The magneto-rheological damper is a semi-active damping device, is manufactured according to the principle that the flow performance of magneto-rheological fluid is changed under the action of a magnetic field, and has the advantages of high response speed, wide adjustment range, large output damping force and the like. At present, the damping device is widely applied to a plurality of damping fields such as vehicles.

The magneto-rheological damper applied to the vibration field has many forms, but most of the magneto-rheological dampers wind a coil on a piston head, and a damping channel exists on the piston head or an annular gap between the piston head and a cylinder barrel. The shear yield strength of the magnetorheological fluid in the damping gap is changed by changing the magnitude of the current, so that the damping force is changed. At present, in many fields, for example, large special vehicles and the like, dampers with superior performance and larger tension than compression damping force need to be generated, but the traditional magnetorheological dampers have many defects as follows:

(1) the utilization rate of the magnetic field is not high enough, and the damper does not fully utilize the magnetic field generated by the electromagnetic coil, so that the generated damping force is not large enough.

(2) The motion stroke of the damper is small, and certain requirements are difficult to meet.

(3) The magneto-rheological damper is easy to precipitate, so that the magneto-rheological property and the vibration damping capacity are influenced.

(4) The tensile and compressive damping forces of the damper are equal in magnitude.

(5) The lead-out wires of the coil are inconvenient and have a certain leakage problem.

(6) When the excitation coil is in power failure under the fault condition, enough damping force cannot be generated to damp, and the damping force is lower under the zero-field condition.

Therefore, the designed magnetorheological damper has zero field safety, high magnetic field utilization rate, large stroke, larger tensile damping force than compressive damping force and precipitation prevention, and meets the requirements of the current application field.

Disclosure of Invention

The invention aims to solve the technical problem that the anti-precipitation magnetorheological damper with the stretching force larger than the compression damping force is provided aiming at the defects in the prior art, so that the damper has the anti-precipitation function, can generate the damping force meeting a certain tension-compression ratio by adjusting the structural parameters, and meets the condition that the stretching force is larger than the compression damping force; the cylinder barrel is separated from the damping generator, so that the motion stroke of the piston can be improved; the damping generator is designed in the forms of specific disc structure design, assembly and the like to fully utilize the magnetic field generated by the coil to form radial and annular damping channels, so that the utilization rate of the magnetic field is greatly improved; the coil leads are convenient, and the leakage problem can not be caused; the damping channel is long, the zero-field damping force is large, and certain failure safety is achieved.

The invention adopts the following technical scheme:

an anti-precipitation magnetorheological damper with stretching greater than compression damping force comprises a damper cylinder and a damping generator, wherein the damper cylinder comprises an outer cylinder and an inner cylinder, the outer cylinder is sleeved on the inner cylinder, cylinder upper end covers are arranged at the tops of the outer cylinder and the inner cylinder, a cylinder lower end cover is arranged at the bottom of the outer cylinder and the inner cylinder, a piston rod is arranged in the inner cylinder, a plurality of anti-precipitation structures are distributed at the piston head of the piston rod at equal intervals along the circumferential surface, a cylinder lower cavity cover is arranged in the inner cylinder between the piston head and the cylinder lower end cover, a plurality of anti-precipitation structures are arranged on the cylinder lower cavity cover, a damping generator liquid outlet and a damping generator liquid inlet are arranged on the damping generator, and the damping generator liquid inlet is communicated with the top of the outer cylinder; the liquid outlet of the damping generator is communicated with the bottom of the outer cylinder barrel through another high-pressure hose.

Specifically, a circular through hole is formed in the center of an upper end cover of the cylinder barrel, one end of the piston rod penetrates through the circular through hole and extends out of the upper end cover of the cylinder barrel, the extending end is connected with an upper lug ring of the piston rod through threads, and a sealing ring is arranged between the upper end cover of the cylinder barrel and the piston rod; an upper cylinder liquid outlet is arranged on the outer cylinder corresponding to the upper end cover of the cylinder, and the upper cylinder liquid outlet is connected with a damping generator liquid inlet through a high-pressure hose; a cylinder barrel lower liquid inlet is formed in the position, corresponding to the inner cylinder barrel and the cylinder barrel lower end cover, of the outer cylinder barrel and is connected with a liquid outlet of the damping generator through another high-pressure hose; the lower end of the lower end cover of the cylinder barrel is provided with a lower lug seat; the outer cylinder barrel is also provided with a nitrogen inflation inlet, and the outer cylinder barrel is connected with the nitrogen inflation inlet in a sealing manner through threads.

Furthermore, clearance fit is formed between the cylinder barrel lower cavity cover and the inner cylinder barrel, between the cylinder barrel lower end cover and the outer cylinder barrel, between the cylinder barrel lower end cover and the inner cylinder barrel, between the outer cylinder barrel and the inner cylinder barrel, between the cylinder barrel upper end cover and the outer cylinder barrel and between the piston head and the inner cylinder barrel; sealing rings are respectively arranged between the cylinder barrel lower end cover and the outer cylinder barrel, between the cylinder barrel lower end cover and the inner cylinder barrel, between the outer cylinder barrel and the inner cylinder barrel, between the cylinder barrel upper end cover and the outer cylinder barrel and between the piston head and the inner cylinder barrel.

Specifically, the piston head is at least provided with four anti-settling structures, the lower cavity cover of the cylinder barrel is at least provided with five anti-settling structures, one of the anti-settling structures is arranged at the center of the lower cavity cover of the cylinder barrel, and the rest four anti-settling structures are arranged at equal intervals from the axis.

Further, prevent deposiing the structure and include sleeve A, structure B and steel ball C, steel ball C sets up between sleeve A and structure B, and sleeve A and structure B pass through threaded connection or carry out welded connection, and sleeve A all opens the through-flow hole all around and the upper surface, and structure B is provided with the toper passageway, is provided with the sealing washer between sleeve A and piston head or the cylinder lower chamber lid respectively, threaded connection between sleeve A and piston head or the cylinder lower chamber lid.

Specifically, six lower cavities and inner cylinder wall connectors are arranged between the periphery of the joint of the cylinder barrel lower end cover and the cylinder barrel lower cavity cover and the inner cylinder barrel, and the six lower cavities and the inner cylinder wall connectors are connected with the bottom end between the inner cylinder barrel and the outer cylinder barrel; the upper end face of the cylinder barrel lower end cover is a conical opening, the cylinder barrel lower end cover is connected with the cylinder barrel lower cavity cover through threads, the upper surfaces of six through holes on the periphery of the connecting surface of the cylinder barrel lower end cover and the cylinder barrel lower cavity cover are tangent to the lower surface of the cylinder barrel lower cavity cover, and the lower surfaces of the six through holes are tangent to the upper end of the conical opening on the upper end face of the cylinder barrel lower end cover.

Specifically, the damping generator comprises a first damping generator cylinder wall, a second damping generator cylinder wall and a third damping generator cylinder wall, wherein a coil is sleeved on the third damping generator cylinder wall, the third damping generator cylinder wall is sleeved in the second damping generator cylinder wall, the second damping generator cylinder wall is sleeved in the first damping generator cylinder wall, the upper end of the first damping generator cylinder wall is provided with a first damping generator upper end cover, the lower end of the first damping generator cylinder wall is provided with a second damping generator lower end cover, the upper end of the second damping generator cylinder wall is provided with a second damping generator upper end cover, the lower end of the second damping generator cylinder wall is provided with a first damping generator lower end cover, and the first damping generator lower end cover is provided with a liquid flow pipe; two groups of first disks and second disks are sequentially and alternately arranged in the third damping generator cylinder wall from top to bottom to form a circulation channel, and the liquid inlet of the damping generator is connected with the liquid outlet of the damping generator through a radial circulation channel, a liquid flow pipe, an upper end cover of the second damping generator, a lower end cover of the first damping generator and an annular channel between the cylinder walls of the first damping generator.

Furthermore, a plurality of through holes are formed in the two first disks at intervals in the circumferential direction respectively, a through hole is formed in the center of each of the two second disks for circulation, magnetorheological fluid enters from the liquid inlet of the damping generator and then sequentially flows through the through holes formed in the circumferential direction of the first disks, the through holes formed in the center of the first second disks, the through holes formed in the circumferential direction of the second disks and the through holes formed in the center of the second disks, then flows through the liquid flow pipe and then flows out of the liquid outlet of the damping generator after passing through the annular channel between the upper end cover of the second damping generator, the lower end cover of the first damping generator and the wall of the first damping generator.

Further, the first disc is connected with the second disc through a copper screw, and the lower end cover of the first damping generator is connected with the second disc through the copper screw; clearance fit is formed between the first disc and the third damping generator cylinder wall, between the second disc and the third damping generator cylinder wall, between the upper end cover of the first damping generator and the first damping generator cylinder wall, between the upper end cover of the second damping generator and the second damping generator cylinder wall, between the third damping generator cylinder wall and the upper end cover of the second damping generator, between the lower end cover of the first damping generator and the third damping generator cylinder wall, between the lower end cover of the first damping generator and the second damping generator cylinder wall, between the lower end cover of the first damping generator and the lower end cover of the second damping generator and between the lower end cover of the second damping generator and the first damping generator cylinder wall;

sealing rings are respectively arranged between the upper end cover of the first damping generator and the cylinder wall of the first damping generator, between the upper end cover of the second damping generator and the cylinder wall of the second damping generator, between the upper end cover of the first damping generator and the upper end cover of the second damping generator, between the lower end cover of the first damping generator and the cylinder wall of the third damping generator, between the lower end cover of the first damping generator and the cylinder wall of the second damping generator, between the lower end cover of the first damping generator and the lower end cover of the second damping generator, between the lower end cover of the second damping generator and the cylinder wall of the first damping generator and between the cylinder wall of the third damping generator and the upper end cover of the second damping generator.

Furthermore, the upper end cover of the first damping generator, the lower end cover of the second damping generator, the cylinder wall of the second damping generator and the cylinder wall of the third damping generator are made of copper materials; the upper end cover of the second damping generator, the first disc, the second disc, the cylinder wall of the first damping generator and the lower end cover of the first damping generator are made of carbon steel materials.

Compared with the prior art, the invention has at least the following beneficial effects:

compared with the common damper, the anti-precipitation magnetorheological damper has the advantages that the magnetic field utilization rate is high, the large damping force can be generated when the damper is electrified, the damping channel is long, the large damping force can be generated under the condition of no electrification, and certain failure safety is realized. The anti-settling structure and the cylinder barrel structure are adopted, the problem that the tensile damping force is larger than the compressive damping force can be solved, the tensile-compression ratio can be adjusted through the size change of the structure, and the damper has the anti-settling effect.

Furthermore, the setting and the existence of the anti-precipitation structure enable the magnetorheological fluid to flow along one direction all the time, and the magnitude of the damping force is related to the flow area under the action of the piston, so that the tensile damping force is larger than the compressive damping force under the unidirectional flow. Through setting up at different positions and preventing deposiing the structure and to the special design of attenuator cylinder, can make magnetorheological suspensions carry out the mixing very fast at any time in the motion process, play the efficiency of preventing deposiing.

Furthermore, when the piston moves downwards, due to the existence of the anti-precipitation structure, the magnetorheological fluid flows out from the through holes of the four anti-precipitation structures on the piston head, and the magnetorheological fluid in the upper cavity of the cylinder barrel, between the two cylinder barrels and the conical opening of the lower end cover of the cylinder barrel can be uniformly mixed at any time; when the piston moves upwards, five through-flow holes of the anti-settling structure on the lower cavity cover of the cylinder barrel are opened, and magnetorheological fluid in the conical port of the lower end cover of the cylinder barrel and the lower cavity of the cylinder barrel can be uniformly mixed at any time. The reasonable up-and-down arrangement of the sedimentation preventing structure, the conical design of the cylinder barrel lower cavity cover and the reasonable arrangement of the six through holes on the inner cylinder barrel and the cylinder barrel lower cavity cover ensure that no sedimentation corner exists in the whole damper in the movement process, and the sedimentation preventing effect is achieved.

Furthermore, the anti-precipitation damper is formed by adopting an anti-precipitation structure, a cylinder body design, an end cover design and the like, and the magnetorheological fluid can be quickly mixed after the piston starts to move, so that the characteristics of the magnetorheological fluid are fully exerted.

Furthermore, through the selection of different cylinder barrel materials and different end cover materials of the damping generator and the reasonable design of other structures, the magnetorheological fluid flows along the winding damping channel in a direction perpendicular to the direction of the magnetic field, the magnetic field generated by the coil is utilized to the maximum extent, the multistage radial and annular damping channels are generated, the utilization rate of the magnetic field is greatly improved, and the zero-field damping force and the maximum damping force are increased. In addition, the damper cylinder is separated from the damping generator, so that the movement stroke of the magnetorheological damper can be improved.

In conclusion, the invention has the advantages of simple structure, large piston stroke and high magnetic field utilization rate, the formed damping channel has the effects of multistage radial flow and annular flow, the magnetorheological damping force is increased, the power-off safety is improved, the tensile damping force is larger than the compressive damping force through the anti-precipitation structure, and the anti-precipitation effect is realized.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a cross-sectional structural view of the damper cylinder of FIG. 1;

FIG. 3 is a schematic cross-sectional view of the anti-settling structure of FIG. 1;

fig. 4 is a schematic cross-sectional structural view of the damping generator of fig. 1.

Wherein: 1. an upper earring of the piston rod; 2. an upper end cover of the cylinder barrel; 3. a piston rod; 4. an outer cylinder barrel; 5. an inner cylinder barrel; 6. an anti-settling structure; 7. a seal ring; 8. a cylinder barrel lower cavity cover; 9. the lower cavity is connected with the inner cylinder wall; 10. a cylinder barrel lower end cover; 11. a lower ear seat; 12. a liquid outlet on the cylinder barrel; 13. a nitrogen gas charging port; 14. a lower liquid inlet of the cylinder barrel; 15. a damping generator liquid outlet; 16. a damping generator liquid inlet; 17. an upper end cover of the first damping generator; 18. the upper end cover of the second damping generator; 19. a first disc; 20. a second disc; 21. a first damping generator cartridge wall; 22. a second damping generator cartridge wall; 23. a coil; 24. a third damping generator cartridge wall; 25. a screw; 26. a liquid flow pipe; 27. a first damping generator lower end cover; 28. a second damping generator lower end cover; 29. a high pressure hose.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside", "outside", "one side", "one end", "one side", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The invention provides an anti-precipitation magnetorheological damper with the tension larger than the compression damping force, which has the anti-precipitation function through designing a special structural combination and design, can generate the damping force meeting a certain tension-compression ratio through adjusting structural parameters, and meets the condition that the tension is larger than the compression damping force; the damping generator is designed in the forms of specific disc structure design, assembly and the like to fully utilize the magnetic field generated by the coil to form radial and annular damping channels, so that the utilization rate of the magnetic field is greatly improved; the cylinder barrel is separated from the damping generator, so that the motion stroke of the piston is improved; the coil leads are convenient, and the leakage problem can not be caused; the damping channel is long, the zero-field damping force is large, and certain failure safety is achieved.

Referring to fig. 1, the anti-settling magnetorheological damper with tension greater than compression damping force of the invention comprises a damper cylinder and a damping generator, and specifically comprises the following components:

the device comprises a piston rod upper ear ring 1, a cylinder barrel upper end cover 2, a piston rod 3, an outer cylinder barrel 4, an inner cylinder barrel 5, an anti-precipitation structure 6, a sealing ring 7, a cylinder barrel lower cavity cover 8, a lower cavity and inner cylinder barrel wall interface 9, a cylinder barrel lower end cover 10, a lower ear seat 11, a cylinder barrel upper liquid outlet 12, a nitrogen inflation inlet 13, a cylinder barrel lower liquid inlet 14, a damping generator liquid outlet 15, a damping generator liquid inlet 16, a first damping generator upper end cover 17, a second damping generator upper end cover 18, a first disc 19, a second disc 20, a first damping generator barrel wall 21, a second damping generator barrel wall 22, a coil 23, a third damping generator barrel wall 24, a copper screw 25, a liquid flow pipe 26 of the first damping generator lower end cover, a first damping generator lower end cover 27, a second damping generator lower end cover 28, a high-pressure hose 29 and magnetorheological fluid.

Referring to fig. 2, the damper cylinder includes an outer cylinder 4 and an inner cylinder 5, the outer cylinder 4 is sleeved on the inner cylinder 5, the piston rod 3 is disposed in the inner cylinder 5, a plurality of anti-precipitation structures 6 are equidistantly distributed along the circumferential surface at the piston head of the piston rod 3, the top of the outer cylinder 4 and the top of the inner cylinder 5 are connected with the liquid inlet of the damping generator through a high-pressure hose 29 for a pipeline, and the bottom of the outer cylinder 4 and the bottom of the inner cylinder 5 are connected with the liquid outlet of the damping generator through the high-pressure hose 29 to form a loop.

The upper part of the damper cylinder is provided with a cylinder upper end cover 2, the lower part of the damper cylinder is correspondingly provided with a cylinder lower end cover 10, the lower part of a cavity of the damper cylinder is provided with a cylinder lower cavity cover 8, one end of a piston rod 3 penetrates through the cylinder upper end cover 2 and is arranged in the cavity of the damper cylinder, a circular through hole is processed in the center of the cylinder upper end cover 2, and the cylinder upper end cover 2 is in sealing connection with the piston rod 3 through a sealing ring 7; the cylinder barrel lower cavity cover 8 is connected with the cylinder barrel lower end cover 10 through threads; the lower cavity cover 8 of the cylinder barrel is in clearance fit with the inner cylinder barrel 5; the lower end cover 10 of the cylinder barrel is in clearance fit with the outer cylinder barrel 4, the lower end cover 10 of the cylinder barrel is sealed with the outer cylinder barrel 4 through a sealing ring 7, and the lower end cover 10 of the cylinder barrel is fixedly connected with the outer cylinder barrel 4 through screws; the lower end cover 10 of the cylinder barrel is in clearance fit with the inner cylinder barrel 5, and the lower end cover 10 of the cylinder barrel and the inner cylinder barrel 5 are sealed through a sealing ring 7; six lower cavities and inner cylinder wall connectors 9 are arranged on the periphery of the cylinder barrel lower cavity cover 8 and the periphery of the inner cylinder barrel 5, a lower lug seat 11 is arranged at the bottom of the cylinder barrel lower end cover 10, and the lower lug seat 11 and the cylinder barrel lower end cover 10 are fixedly connected through four screws.

An upper cylinder liquid outlet 12 is arranged at the position of the outer cylinder 4 and the upper cylinder end cover 2; the upper surface of the outer cylinder barrel 4 is provided with a nitrogen inflation inlet 13, the outer cylinder barrel 4 is connected with the nitrogen inflation inlet 13 through threads, and the outer cylinder barrel 4 is connected with the nitrogen inflation inlet 13 in a sealing manner; the outer cylinder barrel 4, the inner cylinder barrel 5 and the cylinder barrel lower end cover 10 are all provided with a cylinder barrel lower liquid inlet 14.

The outer cylinder barrel 4 is in clearance fit with the inner cylinder barrel 5, and the outer cylinder barrel 4 and the inner cylinder barrel 5 are sealed through a sealing ring 7; the upper end cover 2 of the cylinder barrel is in clearance fit with the inner cylinder barrel 5, and the upper end cover 2 of the cylinder barrel and the inner cylinder barrel 5 are sealed through a sealing ring 7; the upper end cover 2 of the cylinder barrel is in clearance fit with the outer cylinder barrel 4, the upper end cover 2 of the cylinder barrel and the outer cylinder barrel 4 are sealed through a sealing ring 7, and the upper end cover 2 of the cylinder barrel and the outer cylinder barrel 4 are fixedly connected through screws; the piston head of the piston rod 3 is in clearance fit with the inner cylinder 5, and the piston head of the piston rod 3 and the inner cylinder 5 are sealed through a sealing ring 7.

The end of the piston rod 3 is provided with an internal thread, the earring 1 on the piston rod is provided with an external thread, and the earring 1 on the piston rod and the piston rod 3 are connected through thread fastening.

The cylinder barrel lower end cover 10 and the cylinder barrel lower chamber cover 8 junction all around with interior cylinder barrel 5 be provided with six through-flow holes, six through-flow hole lug connection in the bottom between interior cylinder barrel 5 and outer cylinder barrel 4 for magnetorheological suspensions of bottom between interior cylinder barrel 5 and the outer cylinder barrel 4 and magnetorheological suspensions between cylinder barrel lower end cover 10 and the cylinder barrel lower chamber cover 8 mix very easily, play the magnetorheological suspensions between interior cylinder barrel 5 and the outer cylinder barrel 4 and prevent the precipitation effect.

The piston head of the piston rod 3 is connected with the anti-precipitation structures 6 through threads, four anti-precipitation structures 6 are arranged on the upper surface of the piston head of the piston rod 3 at equal intervals from the axis, and each anti-precipitation structure is spaced by 90 degrees and fixedly connected through threads; five anti-precipitation structures 6 are arranged on the cylinder barrel lower cavity cover 8, one of the anti-precipitation structures is arranged at the circle center of the cylinder barrel lower cavity cover 8, the remaining four anti-precipitation structures are arranged at equal intervals from the axis, and each anti-precipitation structure is arranged at 90 degrees and fixedly connected through threads.

The cylinder barrel lower end cover 10 is provided with a conical opening, the cylinder barrel lower end cover 10 is in threaded connection with the cylinder barrel lower cavity cover 8, six through holes on the periphery of the connecting surface of the cylinder barrel lower end cover 10 and the cylinder barrel lower cavity cover 8 are tangent to the lower surface of the cylinder barrel lower cavity cover 8, the conical openings below the six through holes and above the cylinder barrel lower end cover 10 are tangent to the uppermost end, and the six through holes are just connected with the bottom end between the inner cylinder barrel 5 and the outer cylinder barrel 4. Magnetorheological fluid flows into the cylinder barrel from the lower liquid inlet 14 of the cylinder barrel all the time, so that the magnetorheological fluid is uniformly mixed between the lower end cover 10 of the cylinder barrel and the lower cavity cover 8 of the cylinder barrel at any time, and the anti-sedimentation effect of the magnetorheological fluid between the lower end cover 10 of the cylinder barrel and the lower cavity cover 8 of the cylinder barrel is ensured.

When the piston moves upwards, the steel ball on the anti-settling structure 6 at the piston head on the piston rod 3 blocks the conical opening of the upper piston head under the action of gravity and hydraulic pressure, magnetorheological fluid enters the lower end cover 10 of the cylinder barrel through the damping generator, and the conical opening between the lower end cover 10 of the cylinder barrel and the lower cavity cover 8 of the cylinder barrel can be flushed with the magnetorheological fluid settled between the lower end cover 10 of the cylinder barrel and the lower cavity cover 8 of the cylinder barrel at any time. Meanwhile, the steel ball at the anti-precipitation structure 6 on the cylinder barrel lower cavity cover 8 is flushed, the magnetorheological fluid passes through the through flow hole of the anti-precipitation structure 6 on the cylinder barrel lower cavity cover 8, the magnetorheological fluid in the cylinder barrel lower cavity is uniformly mixed at any time, the effect of preventing the lower cavity from precipitation is ensured, and meanwhile, the magnetorheological fluid between the outer cylinder barrel 4 and the inner cylinder barrel 5 flushes the magnetorheological fluid between the cylinder barrel lower end cover 10 and the cylinder barrel lower cavity cover 8 under the action of nitrogen and supplements the magnetorheological fluid in the lower cavity.

When the piston moves downwards, the steel ball in the anti-settling structure 6 on the lower cavity cover 8 of the cylinder barrel of the lower cavity blocks the conical opening on the lower cavity cover 8 of the cylinder barrel under the action of gravity and hydraulic pressure of the lower cavity, the steel ball in the anti-settling structure 6 on the upper piston head of the piston rod 3 pushes the steel ball in the anti-settling structure 6 on the upper piston head of the piston rod 3 under the hydraulic action of the lower cavity, magnetorheological fluid flows out from through holes around the anti-settling structure 6 on the upper piston head of the piston rod 3, magnetorheological fluid in the upper cavity is uniformly mixed, and the anti-settling effect of the upper cavity is ensured. Magnetorheological fluid flows into a damping generator liquid inlet 16 from a cylinder barrel upper liquid outlet 12, then enters a cylinder barrel lower liquid inlet 14 from a damping generator liquid outlet 15, meanwhile, the magnetorheological fluid in a conical opening between the end cover 10 and the cylinder barrel lower cavity cover 8 and the magnetorheological fluid between the outer cylinder barrel 4 and the inner cylinder barrel 5 are flushed, and at the moment, the nitrogen compression compensates for volume difference caused by volume change of the piston rod.

Since the piston head on the piston rod 3 moves in the cylinder barrel either upwards or downwards, the magnetorheological fluid passes through the damping generator from the upper cavity of the cylinder barrel and then enters the lower cavity of the cylinder barrel, and the damping force is calculated in relation to the parameters of the structure. The damping device is related to the annular area of the upper cavity of the cylinder barrel during stretching, is related to the sectional area of the piston rod during compression, and is larger than the area of the piston rod, so that the stretching damping force is larger than the compressing damping force, and meanwhile, the tension-compression ratio of the damper can be optimally designed by adjusting structural parameters.

Referring to fig. 3, the anti-settling structure 6 includes a sleeve a having through-flow holes on and around the sleeve a, a structure B having a tapered channel, and a steel ball C, the sleeve a and the structure B are connected by a screw thread or welded, the sleeve a of the whole anti-settling structure 6, the piston head on the piston rod 3, and the cylinder bottom cover 8 are sealed by a sealing ring 7, and the sleeve a of the whole anti-settling structure 6, the piston head on the piston rod 3, and the cylinder bottom cover 8 are fixedly connected by a screw thread.

Referring to fig. 4, the structure of the damping generator of the magnetorheological damper is shown, the damping generator includes a first damping generator cylinder wall 21, a second damping generator cylinder wall 22 and a third damping generator cylinder wall 24, the third damping generator cylinder wall 24 is sleeved in the second damping generator cylinder wall 22, the second damping generator cylinder wall 22 is sleeved in the first damping generator cylinder wall 21, the upper end of the first damping generator cylinder wall 21 is provided with a first damping generator upper end cover 17, the lower end is provided with a second damping generator lower end cover 28, the upper end of the second damping generator cylinder wall 22 is provided with a second damping generator upper end cover 18, and the lower end is provided with a first damping generator lower end cover 27; two groups of first disks 19 and second disks 20 are alternately arranged in the third damping generator cylinder wall 24, and a damping generator liquid outlet 15 and a damping generator liquid inlet 16 are arranged on the damping generator; the liquid outlet 12 on the cylinder barrel is in threaded connection with the liquid inlet 16 of the damping generator by a high-pressure hose 29; the cylinder barrel lower liquid inlet 14 and the damping generator liquid outlet 15 are in threaded connection through a high-pressure hose 29.

A first disc 19, a second disc 20, a second disc 19 and a second disc 20 are sequentially arranged in the third damping generator cylinder wall 24 from top to bottom, a plurality of through holes are circumferentially arranged on the two first discs 19 at intervals respectively, a through hole is formed in the center of each of the two second discs 20 for circulation, magnetorheological fluid enters from the damping generator liquid inlet 16 and then sequentially flows through the through holes circumferentially arranged on the first disc 19, the through holes centrally arranged on the first disc 20, the through holes circumferentially arranged on the second disc 19 and the through holes centrally arranged on the second disc 20 and then flows out from the damping generator liquid outlet 15 through the liquid flow pipe 26.

The first disc 19 is in clearance fit with the third damping generator cylinder wall 24; the second disc 20 is in clearance fit with the third damping generator cylinder wall 24; the first disc 19 and the second disc 20 are in threaded connection through a copper screw 25;

the first damping generator upper end cover 17 is in clearance fit with the first damping generator cylinder wall 21, the first damping generator upper end cover 17 and the first damping generator cylinder wall 21 are sealed through the sealing ring 7, and the first damping generator upper end cover 17 and the first damping generator cylinder wall 21 are fixedly connected through screws.

The upper end cover 18 of the second damping generator is in clearance fit with the cylinder wall 22 of the second damping generator, and the upper end cover 18 of the second damping generator is sealed with the cylinder wall 22 of the second damping generator through a sealing ring 7.

The first damping generator upper end cover 17 and the second damping generator upper end cover 18 are sealed by a seal ring 7.

The coil 23 is sleeved on the third damping generator cylinder wall 24; the third damping generator cylinder wall 24 and the second damping generator upper end cover 18 are in clearance fit, and the third damping generator cylinder wall 24 and the second damping generator upper end cover 18 are sealed through a sealing ring 7.

A liquid flowing pipe 26 is arranged on the lower end cover 27 of the first damping generator; the lower end cover 27 of the first damping generator is in clearance fit with the cylinder wall 24 of the third damping generator, and the lower end cover 27 of the first damping generator and the cylinder wall 24 of the third damping generator are sealed by a sealing ring 7; the lower end cover 27 of the first damping generator is in threaded connection with the second disc 20 through a copper screw 25; the lower end cover 27 of the first damping generator is in clearance fit with the cylinder wall 22 of the second damping generator, and the lower end cover 27 of the first damping generator and the cylinder wall 22 of the second damping generator are sealed by a sealing ring 7; the lower end cover 27 of the first damping generator and the lower end cover 28 of the second damping generator are in clearance fit, and the lower end cover 27 of the first damping generator and the lower end cover 28 of the second damping generator are sealed through a sealing ring 7.

The lower end cover 28 of the second damping generator is in clearance fit with the cylinder wall 21 of the first damping generator, the lower end cover 28 of the second damping generator is sealed with the cylinder wall 21 of the first damping generator through a sealing ring 7, and the lower end cover 28 of the second damping generator is fixedly connected with the cylinder wall 21 of the first damping generator through screws.

The first damping generator upper end cover 17, the second damping generator lower end cover 28, the second damping generator cylinder wall 22 and the third damping generator cylinder wall 24 are made of copper materials, and the second damping generator upper end cover 18, the first disc 19, the second disc 20, the first damping generator cylinder wall 21 and the first damping generator lower end cover 27 are made of carbon steel materials. The design and combination of the structure form a multistage radial and annular damping channel which is fully utilized, the utilization rate of a magnetic field is increased, the power-off safety is improved, and the maximum damping force is also increased. The closed broken line with arrows in fig. 4 is the distribution of the magnetic induction lines.

The damping generator and the cylinder barrel are separated, so that the damper has the characteristic of large stroke; the damping generator achieves the characteristics of simple structure and high utilization rate of a magnetic field through the selection of special magnetic materials and the design of the structure, forms a damping channel with the effect of multistage radial flow and annular flow, increases the magneto-rheological damping force and also increases the power-off safety; the structure has the effect that the tension is larger than the compression damping force through the design of the anti-precipitation structure, the cylinder barrel structure, the end cover structure and the like, and has the effect of uniformly mixing the magnetorheological fluid at any time; the air cavity is arranged between the inner cylinder and the outer cylinder in a compensating way, so that the air cavity has the characteristics of large volume and tight integral installation space.

The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.