CN113606276B - Circumferential array spiral groove piston anti-settling magnetorheological damper - Google Patents
Circumferential array spiral groove piston anti-settling magnetorheological damper Download PDFInfo
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- CN113606276B CN113606276B CN202110926444.8A CN202110926444A CN113606276B CN 113606276 B CN113606276 B CN 113606276B CN 202110926444 A CN202110926444 A CN 202110926444A CN 113606276 B CN113606276 B CN 113606276B
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- 239000012530 fluid Substances 0.000 claims abstract description 38
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- 238000007667 floating Methods 0.000 claims description 19
- 230000005284 excitation Effects 0.000 claims description 6
- 230000003139 buffering effect Effects 0.000 claims description 4
- 238000013016 damping Methods 0.000 abstract description 18
- 238000004062 sedimentation Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 5
- 230000001174 ascending effect Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 6
- 239000003822 epoxy resin Substances 0.000 description 5
- 229920000647 polyepoxide Polymers 0.000 description 5
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- 238000011084 recovery Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 238000012827 research and development Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/061—Mono-tubular units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3214—Constructional features of pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3221—Constructional features of piston rods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3235—Constructional features of cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
- F16F9/535—Magnetorheological [MR] fluid dampers
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention discloses a circumferential array spiral groove piston anti-settling magnetorheological damper which comprises a piston cylinder, a piston rod and a piston assembly, wherein the piston assembly is in single-degree-of-freedom rotating fit with the piston rod, the piston assembly is in axial sealing sliding and rotating fit with the inner circular surface of the piston cylinder, a stirring assembly is in transmission fit with the piston assembly, spiral grooves are formed in the outer circular surface of the piston assembly, and the spiral grooves are communicated to two axial end surfaces of the piston assembly. In the invention, in the ascending or descending process of the piston assembly, circumferential tangential component force is applied to the piston assembly in the flowing process of the magnetorheological fluid, so that the whole piston assembly can be driven to rotate without external energy supply, the piston assembly drives the stirring assembly to rotate so as to stir the magnetorheological fluid, the sedimentation phenomenon of the magnetorheological fluid is improved, the damper can quickly and automatically recover to a normal working state in a short time after starting to work, and the problem of the reduction of damping performance and vibration reduction effect caused by the sedimentation of the magnetorheological fluid is effectively avoided.
Description
Technical Field
The invention relates to the technical field of dampers, in particular to a circumferential array spiral groove piston anti-settling magneto-rheological damper.
Background
The rheological damper is a vibration damping device based on the magneto-rheological effect, can perform semi-active control due to adjustable damping force, and is widely applied to various fields; however, the magnetorheological fluid has the problem of standing and settling, so that the research and development and the application of the magnetorheological damper are greatly limited.
In the prior art, the problem of sedimentation of the magnetorheological fluid is usually solved by improving the material of the magnetorheological fluid, but the improvement of the magnetorheological fluid can only delay the sedimentation speed of the magnetorheological fluid and cannot solve the problem of sedimentation of the magnetorheological fluid after long-time placement; when the damper is kept still for a long time, the magneto-rheological fluid still can be settled, so that the damping performance and the damping effect of the damper are influenced.
Disclosure of Invention
In view of the above, the invention provides a circumferential array spiral groove piston anti-settling magnetorheological damper, which can realize rapid and automatic stirring of magnetorheological fluid after the start of normal damping operation, so that the magnetorheological fluid is restored to a normal operating state, and the problem of reduction of damping performance and damping effect caused by settlement of the magnetorheological fluid is effectively solved.
The invention discloses a circumferential array spiral groove piston anti-settling magnetorheological damper, which comprises a piston cylinder, a piston rod in axial sliding fit with the piston cylinder and a piston assembly connected to the piston rod, wherein the piston assembly is in single-degree-of-freedom rotating fit with the piston rod, the piston assembly is in axial sealing sliding and rotating fit with the inner circular surface of the piston cylinder, a stirring assembly is in transmission fit with the piston assembly, a spiral groove is formed in the outer circular surface of the piston assembly and communicated to the two axial end surfaces of the piston assembly, when the piston rod drives the piston assembly to axially slide in the piston cylinder, magnetorheological fluid in spaces on two axial sides of the piston assembly in the piston cylinder flows through the spiral groove, the magnetorheological fluid drives the piston assembly to rotate at the same time, and further drives the stirring assembly to rotate so as to stir the magnetorheological fluid.
Furthermore, the stirring assembly comprises a buffer sleeve fixed at the lower end of the piston assembly, a stirring shaft sleeved in the buffer sleeve in a single-degree-of-freedom axial sliding manner, stirring blades arranged on the stirring shaft and an elastic part, and the elastic part is connected between the stirring shaft and the buffer sleeve and used for providing axial elastic buffering force for the stirring shaft.
Furthermore, the piston assembly comprises a piston body, an annular mounting groove is formed in the middle of the outer circular surface of the piston body in the circumferential direction, a magnet exciting coil is packaged in the mounting groove, a set gap is formed between the outer contour formed after the magnet exciting coil is packaged and the inner wall of the piston cylinder, the outer circular surface of the piston body is axially divided into an upper outer circular surface and a lower outer circular surface by the mounting groove, and the spiral grooves are formed in the upper outer circular surface and the lower outer circular surface of the piston body.
Further, the piston assembly further comprises an upper guide ring and a lower guide ring, the upper guide ring and the lower guide ring are respectively connected to the upper end and the lower end of the piston body, the upper guide ring and the lower guide ring are in axial sliding sealing fit with the inner circular surface of the piston cylinder, a set gap is formed between the outer circular surface of the piston body and the inner circular surface of the piston cylinder, and guide through holes are axially formed in the upper guide ring and the lower guide ring.
The floating piston is arranged in the piston cylinder and positioned below the piston assembly, the floating piston is in axial sealing sliding fit with the inner circular surface of the piston cylinder, and a sealed air chamber is formed between the floating piston and the bottom of the piston cylinder.
Furthermore, be provided with the spacing subassembly that is used for restricting the two relative turned angle between last guide ring and the piston rod, spacing subassembly includes first locating part and second locating part, and one of them locating part is connected on last guide ring, and another locating part is located on the piston rod, the spacing breach of circumference has on the first locating part, be located the spacing breach of first locating part on the second locating part.
Further, the piston assembly further comprises a first inner bushing and a second inner bushing, the lower end of the piston rod is a stepped shaft with a large upper end and a small lower end, an assembling hole matched with the small-diameter section of the piston rod is formed in the upper end of the piston body, the first inner bushing is sleeved on the small-diameter section of the piston rod and abuts against the shaft shoulder, the second inner bushing is sleeved on the position close to the bottom of the small-diameter section of the piston rod, and the small-diameter section of the piston rod is installed in the assembling hole and is in running fit with the assembling hole through the first inner bushing and the second inner bushing.
Further, the lower end of the stirring shaft extends downwards to exceed the stirring blades, the lower end of the stirring shaft is connected with a ball head, and the ball head downwards abuts against the upper end face of the floating piston.
Furthermore, self-lubricating sleeves are fixed on the upper outer sleeves of the upper guide ring and the lower guide ring and are in axial sealing sliding and rotating fit with the inner circular surface of the piston cylinder.
Further, the piston rod is of a hollow structure, a wire outlet hole communicated with the inner cavity of the piston rod is formed in the lower outer circular surface or the upper circular surface of the piston body, a wire penetrates through the piston rod, and the wire penetrates out of the wire outlet hole to be connected with the excitation coil.
The invention has the beneficial effects that:
in the invention, in the ascending or descending process of the piston assembly, circumferential tangential component force is applied to the piston assembly in the flowing process of the magnetorheological fluid, so that the whole piston assembly can be driven to rotate without external energy supply, the piston assembly drives the stirring assembly to rotate so as to stir the magnetorheological fluid, the sedimentation phenomenon of the magnetorheological fluid is improved, the damper can quickly and automatically recover to a normal working state in a short time after starting to work, and the problem of the reduction of damping performance and vibration reduction effect caused by the sedimentation of the magnetorheological fluid is effectively avoided; in addition, the spiral groove effectively increases the length of the damping channel, is beneficial to reducing the length of the piston assembly, further achieves the purposes of saving the assembly space and improving the compact structure of the damper, and also increases the adjustable range of the damping force.
Drawings
The invention is further described below with reference to the figures and examples.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic perspective view;
FIG. 3 is a partial schematic view of the structure;
Detailed Description
As shown in the figure: the circumferential array spiral groove piston anti-settling magnetorheological damper comprises a piston cylinder 1, a piston rod 2 in axial sliding fit with the piston cylinder and a piston assembly 3 connected to the piston rod, wherein the piston assembly is in single-degree-of-freedom rotating fit with the piston rod, the piston assembly is in axial sealing sliding and rotating fit with the inner circular surface of the piston cylinder, a stirring assembly is in transmission fit with the piston assembly, spiral grooves 4 are formed in the outer circular surface of the piston assembly and communicated to the two axial end faces of the piston assembly, when the piston rod drives the piston assembly to axially slide in the piston cylinder, magnetorheological fluid in spaces on two axial sides of the piston assembly flows through the spiral grooves, the piston assembly is driven to rotate by the magnetorheological fluid, and then the stirring assembly is driven to rotate to stir the magnetorheological fluid.
Referring to fig. 1, the upper end opening and the lower end of a piston cylinder 1 are sealed, the opening end sealing cover is provided with a cylinder cover 14, the cylinder cover 14 and the piston cylinder 1 are sealed through a sealing ring, the cylinder cover 14 is provided with a mounting hole, a piston rod penetrates through the mounting hole to be in single-degree-of-freedom axial sealing sliding fit with the cylinder cover 14, the piston rod and the inner circular surface of the cylinder cover 14 are sealed through the sealing ring, a threaded section is reserved at the upper end of the piston rod and used for being connected with external equipment, a bushing 15 is sleeved outside the upper end of the piston rod, the threaded section of the piston rod is connected with a compression nut 16, the compression nut presses the bushing on the upper end surface of the cylinder cover 14, the initial stability of the whole damper is improved through the structure, and when the piston rod of the damper needs to be connected with the external equipment, the bushing 15 and the compression nut 16 can be detached;
with reference to fig. 3, a plurality of spiral grooves 4 are formed in the outer circumferential surface of the piston assembly, the spiral grooves 4 are distributed in a circumferential array manner, upper and lower hydraulic chambers in the piston cylinder are communicated through the spiral grooves 4, when the damper works, the piston assembly axially runs, magnetorheological fluid in the upper and lower hydraulic chambers in the piston cylinder flows through the spiral grooves 4 at the moment, circumferential tangential component force is applied to the piston assembly in the flowing process of the magnetorheological fluid, the whole piston assembly can be driven to rotate without external energy supply, the piston assembly drives the stirring assembly to rotate so as to stir the magnetorheological fluid, the sedimentation phenomenon of the magnetorheological fluid is improved, the damper can quickly and automatically recover to a normal working state in a short time after the damper starts to work, and therefore the problem that damping performance and vibration attenuation effect are reduced due to sedimentation of the magnetorheological fluid is effectively avoided; in addition, the spiral groove 4 effectively increases the length of the damping channel, is beneficial to reducing the length of the piston assembly, further achieves the purposes of saving the assembly space and improving the compact structure of the damper, and also increases the adjustable range of the damping force.
In this embodiment, the stirring assembly includes a buffer sleeve 5 fixed to the lower end of the piston assembly, a stirring shaft 6 sleeved in the buffer sleeve in a single-degree-of-freedom axial sliding manner, a stirring blade 7 mounted on the stirring shaft, and an elastic member 17 connected between the stirring shaft and the buffer sleeve and used for providing an axial elastic buffering force for the stirring shaft. As shown in fig. 1, the cushion sleeve 5 is fixed to a lower end surface of the lower guide ring 3c, wherein the lower guide ring 3c is discussed in detail later; the inner circle of the buffer sleeve 5 is of an inner spline structure, the stirring shaft 6 is in axial sliding fit with the buffer sleeve 5 through an outer spline structure, the upper end of the buffer sleeve is provided with an upper connecting disc which extends radially outwards, the middle part of the stirring shaft is provided with a lower connecting disc which extends radially outwards, the elastic part 17 is a cylindrical spiral spring which is sleeved on the buffer sleeve 5, and two ends of the elastic part 17 are respectively connected to the upper connecting disc and the lower connecting disc, of course, the elastic part 17 can also be of other known elastic structures; the elastic element is used for providing axial sliding buffer force for the stirring shaft 6 and providing axial tension for the stirring shaft 6 at the same time so as to prevent the stirring shaft 6 from falling off the buffer sleeve 5; the structure can ensure that the stirring shaft 6 realizes axial buffering when the piston suddenly acts, and can improve the stirring efficiency.
In this embodiment, the piston assembly 3 includes a piston body 3a, an annular mounting groove is circumferentially arranged in the middle of the outer circumferential surface of the piston body, the mounting groove is internally sealed with a magnet exciting coil 8, a set gap is formed between an outer contour formed after the magnet exciting coil is packaged and the inner wall of the piston cylinder 1, the mounting groove axially divides the outer circumferential surface of the piston body into an upper outer circumferential surface and a lower outer circumferential surface, and the spiral grooves 4 are formed in the upper outer circumferential surface and the lower outer circumferential surface of the piston body. Referring to fig. 1, the installation groove is filled with epoxy resin 18, the excitation coil 8 is encapsulated in the installation groove through the epoxy resin, the epoxy resin 18 forms an annular structure, a set gap is formed between the outer circular surface of the epoxy resin 18 and the inner wall of the piston cylinder 1, the gap can be adjusted according to the actual working condition, and the arrangement of the gap is favorable for the mutual communication between the upper outer circular surface of the piston body and the upper spiral groove 4 of the lower outer circular surface; in addition, the magnet exciting coil 8 is arranged at the middle position of the piston body, so that the magnetorheological fluid in the spiral grooves on the upper outer circular surface and the lower outer circular surface of the piston body can be controlled conveniently; the magnetic field generated by the excitation coil 8 acts on the magnetorheological fluid in the damping channel to control the damping performance of the magnetorheological fluid so as to control the damping performance of the damper;
in this embodiment, the piston assembly 3 further includes an upper guide ring 3b and a lower guide ring 3c, the upper guide ring 3b and the lower guide ring 3c are respectively connected to the upper end and the lower end of the piston body 3a, the upper guide ring 3b and the lower guide ring 3c are in axial sliding sealing fit with the inner circumferential surface of the piston cylinder, a set gap is formed between the outer circumferential surface of the piston body and the inner circumferential surface of the piston cylinder, and a flow guide through hole 3d is axially formed in the upper guide ring 3b and the lower guide ring 3 c. The guide through holes 3d are preferably provided with a plurality of guide through holes which are distributed along the circumferential array of the axial end face of the corresponding guide ring, each guide through hole is matched with each spiral groove 4 one by one, and the guide channel is opposite to the adjacent end part of the spiral groove 4 matched with the guide channel, so that the good reason purpose is achieved, the circumferential uniform flow of the magnetorheological fluid is facilitated, and the auxiliary stirring function is achieved for the magnetorheological fluid; the upper guide ring 3b and the lower guide ring 3c are in sealing sliding fit with the inner circular surface of the piston cylinder, so that the sealing performance of the piston assembly is ensured, and the supporting and guiding effects on the whole piston assembly are achieved, the lower end of the piston rod is effectively supported, and the structural stability and the operation reliability of the whole damper are improved; the clearance is set to have between piston body excircle face and the interior disc of piston cylinder, and this clearance can be adjusted according to the in-service use operating mode, establishes through keeping somewhere of clearance, does benefit to the assembly between piston body and the piston cylinder, also does benefit to the intercommunication between the helicla flute on the excircle face and the lower excircle face on the piston body simultaneously, during the in-service use, should guarantee that this setting clearance is less to guarantee that most magnetorheological suspensions flow through the helicla flute.
In the embodiment, the device further comprises a floating piston 9, the floating piston is arranged in the piston cylinder 1 and is positioned below the piston assembly, the floating piston is in axial sealing sliding fit with the inner circular surface of the piston cylinder 1, and a sealed air chamber is formed between the floating piston and the bottom of the piston cylinder 1. Referring to fig. 1, a piston cylinder 1 is a two-section split structure, the upper section of the piston cylinder is a working cylinder barrel 1a, the lower section of the piston cylinder is a cylinder storage barrel 1b, the lower end of the working cylinder barrel 1a is in threaded sealing connection with the upper end of the cylinder storage barrel 1b, and the lower end of the working cylinder barrel 1a and the cylinder storage barrel 1b are sealed by sealing rings in the axial direction and the radial direction; the floating piston 9 is positioned in the air storage cylinder 1b, and the air storage cylinder 1b is provided with an inflation valve 20; when the floating piston 9 moves downwards, air in the air chamber of the air storage cylinder barrel 1b is compressed, the floating piston and the piston cylinder assembly form a compensation cylinder structure, the floating piston can axially slide in a self-adaptive manner based on the change of the volume in the process of piston compression and recovery strokes, the compensation cylinder can ensure that the damper does not have sudden change of a damping force value at the compression and recovery turning points, and the stable transition of compression and recovery movement is realized.
In this embodiment, a limiting component for limiting a relative rotation angle between the upper guide ring and the piston rod is disposed between the upper guide ring and the piston rod, the limiting component includes a first limiting member 10 and a second limiting member 11, one of the limiting members is connected to the upper guide ring, the other limiting member is disposed on the piston rod, a circumferential limiting notch is disposed on the first limiting member 10, and the second limiting member 11 is disposed in the limiting notch of the first limiting member 10. Referring to fig. 1 and 3, in this embodiment, a first limiting member 10 is connected to a piston rod, the first limiting member is a block structure and extends along a certain radial direction of the piston rod, a corresponding second limiting member 11 is connected to an upper end surface of an upper guide ring, wherein the upper guide ring is a semi-annular tile-shaped structure, a circumferential gap of the upper guide ring is a limiting gap, an opening degree of the gap is a limiting angle, when the upper guide ring rotates, two circumferential ends of the second limiting member 11 abut against the first limiting member 10, the rotation is blocked, and the first limiting member 10 and the second limiting member 11 are used to control a relative rotation angle of the piston assembly, so that the rotation angle of the piston assembly is within a preset range, and the middle lead 19 is not damaged when the piston assembly and the piston rod generate relative rotation motion.
In this embodiment, the piston assembly 3 further includes a first inner bushing 3e and a second inner bushing 3f, the lower end of the piston rod is a stepped shaft with a large upper end and a small lower end, the upper end of the piston body is provided with an assembly hole matched with the small diameter section of the piston rod, the first inner bushing 3e is sleeved on the small diameter section of the piston rod and abuts against the shaft shoulder, the second inner bushing 3f is sleeved on the position close to the bottom of the small diameter section of the piston rod, and the small diameter section of the piston rod is installed in the assembly hole and is rotatably matched with the assembly hole through the first inner bushing 3e and the second inner bushing 3 f. As shown in fig. 1, the first inner bushing 3e and the second inner bushing 3f are both copper bushings, or may be made of other materials, the first inner bushing 3e and the second inner bushing 3f are in interference fit with the piston rod, and the first inner bushing 3e and the second inner bushing 3f are in rotational fit with the assembly hole, so that the piston rod and the piston assembly can be prevented from being directly contacted and worn by the structure, and the first inner bushing 3e and the second inner bushing 3f are arranged to facilitate later-stage maintenance; in order to ensure the single-degree-of-freedom sliding fit between the piston assembly and the piston rod, a pin is further required to be arranged between the piston assembly and the piston rod, wherein the pin can be radially arranged on the piston body, an annular groove is formed in the piston rod, and the inner end part of the pin abuts against the inside of the annular groove, so that the piston assembly is axially connected with the piston rod, or the pin can be arranged on the upper guide ring, which is not described in detail.
In this embodiment, the lower end of the stirring shaft 6 extends downward beyond the stirring blades, the lower end of the stirring shaft 6 is connected with a ball head 12, and the ball head is supported downward against the upper end face of the floating piston 9. In the standing state of the damper, the stirring shaft stretches the elastic part 17 under the influence of self weight, so that the ball head 12 is in contact with the top of the floating piston, the ball head 12 reduces the contact area and reduces the friction with the magnetorheological fluid during rotation or axial sliding; when the damper works, the buffer sleeve 5 can perform linear motion and rotary motion along with the piston assembly, the piston assembly moves downwards, the stirring shaft 6 slides upwards relative to the buffer sleeve 5 in the axial direction, the elastic part 17 is compressed at the moment, the acting force between the ball head and the floating piston is buffered, and meanwhile, the stirring blades rotate along with the piston assembly to realize automatic stirring without external energy.
In this embodiment, the self-lubricating sleeve 13 is fixed on the upper outer sleeve of the upper guide ring 3b and the lower guide ring 3c, and the self-lubricating sleeve 13 is axially, hermetically, slidably and rotatably matched with the inner circular surface of the piston cylinder. The self-lubricating sleeve is a polytetrafluoroethylene ring, and can be made of other materials with self-lubricating performance, the contact area between the piston assembly and the piston cylinder is reduced by the self-lubricating sleeve, and the sliding and rotating friction resistance of the piston assembly is reduced by the self-lubricating performance of the self-lubricating sleeve.
In this embodiment, the piston rod 2 is a hollow structure, a wire outlet hole communicated with the inner cavity of the piston rod is formed in the lower outer circular surface or the upper circular surface of the piston body, a wire 19 penetrates through the piston rod 2, and the wire penetrates through the wire outlet hole and is connected with the excitation coil 8. As shown in fig. 1, the piston rod is a two-section structure formed by an upper piston rod and a lower piston rod, wherein the upper piston rod is matched with the cylinder barrel cover, the lower piston rod is matched with the piston assembly, the upper piston rod and the lower piston rod are both in a hollow structure, the upper piston rod is in threaded connection with the lower piston rod, a lead 19 penetrates into the mounting groove through the piston rod and the lead hole to be connected with the excitation coil 8, and the lead hole and the exposed lead are packaged through epoxy resin 18.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The utility model provides a circumference array helicla flute piston prevents subsiding magnetic current becomes attenuator, includes piston cylinder, piston rod and piston assembly, its characterized in that: the piston assembly is in single-degree-of-freedom rotation fit with the piston rod, the piston assembly is in axial sealing sliding and rotation fit with the inner circular surface of the piston cylinder, the stirring assembly is in transmission fit with the piston assembly, the outer circular surface of the piston assembly is provided with a spiral groove, the spiral groove is communicated to two axial end surfaces of the piston assembly, when the piston rod drives the piston assembly to axially slide in the piston cylinder, magnetorheological fluid in spaces on two axial sides of the piston assembly in the piston cylinder flows through the spiral groove, the magnetorheological fluid drives the piston assembly to rotate at the same time, and then the stirring assembly is driven to rotate to stir the magnetorheological fluid;
the piston assembly comprises a piston body, an annular mounting groove is formed in the middle of the excircle surface of the piston body along the circumferential direction, a magnet exciting coil is mounted in the mounting groove in a sealing mode, a set gap is formed between the outer contour formed after the magnet exciting coil is mounted and the inner wall of the piston cylinder, the mounting groove axially divides the excircle surface of the piston body into an upper excircle surface and a lower excircle surface, and the spiral grooves are formed in the upper excircle surface and the lower excircle surface of the piston body;
the piston assembly further comprises an upper guide ring and a lower guide ring, the upper guide ring and the lower guide ring are respectively connected to the upper end and the lower end of the piston body, the upper guide ring and the lower guide ring are in axial sliding and sealing fit with the inner circular surface of the piston cylinder, a set gap is formed between the outer circular surface of the piston body and the inner circular surface of the piston cylinder, and guide through holes are axially formed in the upper guide ring and the lower guide ring.
2. The circumferential array spiral groove piston anti-settling magnetorheological damper of claim 1, wherein: the stirring assembly comprises a buffer sleeve fixed at the lower end of the piston assembly, a stirring shaft sleeved in the buffer sleeve in a single-degree-of-freedom axial sliding manner, stirring blades arranged on the stirring shaft and an elastic piece, wherein the elastic piece is connected between the stirring shaft and the buffer sleeve and used for providing axial elastic buffering force for the stirring shaft.
3. The circumferential array spiral groove piston anti-settling magnetorheological damper of claim 2, wherein: the floating piston is arranged in the piston cylinder and positioned below the piston assembly, the floating piston is in axial sealing sliding fit with the inner circular surface of the piston cylinder, and a sealed air chamber is formed between the floating piston and the bottom of the piston cylinder.
4. The circumferential array spiral groove piston anti-settling magnetorheological damper of claim 1, wherein: the limiting assembly is arranged between the upper guide ring and the piston rod and used for limiting the relative rotating angle of the upper guide ring and the piston rod, the limiting assembly comprises a first limiting part and a second limiting part, one limiting part is connected to the upper guide ring, the other limiting part is arranged on the piston rod, a circumferential limiting notch is formed in the first limiting part, and the second limiting part is located in the limiting notch of the first limiting part.
5. The circumferential array spiral groove piston anti-settling magnetorheological damper of claim 1, wherein: the piston assembly further comprises a first inner bushing and a second inner bushing, the lower end of the piston rod is a stepped shaft with a large upper end and a small lower end, an assembling hole matched with the small-diameter section of the piston rod is formed in the upper end of the piston body, the first inner bushing is sleeved on the small-diameter section of the piston rod and abuts against the shaft shoulder, the second inner bushing is sleeved on the position close to the bottom of the small-diameter section of the piston rod, and the small-diameter section of the piston rod is installed in the assembling hole and is in running fit with the assembling hole through the first inner bushing and the second inner bushing.
6. The circumferential array spiral groove piston anti-settling magnetorheological damper of claim 3, wherein: the lower end of the stirring shaft extends downwards to exceed the stirring blades, the lower end of the stirring shaft is connected with a ball head, and the ball head is downwards abutted to the upper end face of the floating piston.
7. The circumferential array spiral groove piston anti-settling magnetorheological damper of claim 1, wherein: and self-lubricating sleeves are fixed on the upper guide ring and the upper outer sleeve of the lower guide ring, and are in axial sealing sliding and rotating fit with the inner circular surface of the piston cylinder.
8. The circumferential array spiral groove piston anti-settling magnetorheological damper of claim 1, wherein: the piston rod is of a hollow structure, a wire outlet hole communicated with the inner cavity of the piston rod is formed in the lower outer circular surface or the upper circular surface of the piston body, a wire penetrates through the piston rod, and the wire penetrates out of the wire outlet hole to be connected with the excitation coil.
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| CN114151501A (en) * | 2021-11-17 | 2022-03-08 | 重庆交通大学 | Novel intelligent damping base based on magneto-rheological damper |
| CN114251407A (en) * | 2021-11-18 | 2022-03-29 | 广西科技大学 | O-shaped rod type anti-precipitation magnetorheological damper |
| CN114251406B (en) * | 2021-11-18 | 2024-03-15 | 广西科技大学 | Rotary piston rod type anti-sedimentation magnetorheological damper |
| CN114857200B (en) * | 2022-03-10 | 2023-08-25 | 嘉兴学院 | Spiral groove type magneto-rheological damper |
| CN115289168B (en) * | 2022-05-27 | 2024-07-09 | 深圳市朝上科技有限责任公司 | Magnetorheological damper with tooth-shaped runner |
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