CN204419958U - A kind of outside cone angle magnetic fluid damper - Google Patents
A kind of outside cone angle magnetic fluid damper Download PDFInfo
- Publication number
- CN204419958U CN204419958U CN201520056528.0U CN201520056528U CN204419958U CN 204419958 U CN204419958 U CN 204419958U CN 201520056528 U CN201520056528 U CN 201520056528U CN 204419958 U CN204419958 U CN 204419958U
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- Prior art keywords
- permanent magnet
- endoporus
- cone angle
- shell body
- vent slot
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Abstract
A kind of outside cone angle magnetic fluid damper, belongs to mechanical engineering vibration field.Successfully solve the problem that existing magnetic fluid damper cannot be applied due to various structures problem in engineering reality.This device comprises left shell (1), magnetic liquid (2), permanent magnet (3), right shell body (4), vent slot (5), when extraneous vibration, magnetic liquid moves with permanent magnet (3), thus absorption energy, because cone angle effect makes forming frequency between permanent magnet (3) and housing (1) poor, damping efficiency is made to reach maximum.
Description
Technical field
The utility model relates to a kind of outside cone angle magnetic fluid damper, is applicable to the vibration damping of long straight object in astrovehicle.
Background technique
Magnetic fluid damper is a kind of passive damper, higher to the susceptibility of inertial force, the advantage such as have that structure is simple, volume is little, power consumption is large and the life-span is long.Due to the running environment that spacecraft is special, himself volume, weight and the energy are subject to certain restrictions, therefore magnetic fluid damper is very suitable for the Large Spacecraft long low frequency of straight object, the vibration damping of little amplitude, as the solar energy sailboard, antenna etc. of space station, simultaneously, it also has broad application prospects on the ground, as reached the vibration damping of high powered antenna of hundred meters, vibration damping of precision balance etc.But existing magnetic fluid damper cannot be applied due to various structures problem in engineering reality, particular problem is as follows:
Magnetic fluid damper the most common mainly adopts the second order law of buoyancy of magnetic liquid now, as as described in documents 1 (publication number CN102032304A applies for a patent), described in documents 2 (publication number CN104074903A applies for a patent), described in documents 3 (publication number CN102042359A applies for a patent), described in documents 4 (publication number CN102494070A), with documents 6 (publication number CN103122965A) described in documents 5 (publication number JP11-230255A), minority have employed the single order law of buoyancy of magnetic liquid, as as described in documents 7 (publication number JP11-223247A applies for a patent).
Damper means described in documents 1 (what publication number was CN102032304A applies for a patent), this vibration damper comprises non-magnetic shell, magnetic liquid, permanent magnet, nut, end cap, bolt, screw, sealing gasket and O RunddichtringO.This application patent by using columniform permanent magnet as mass block, in non-magnetic shell, fill magnetic liquid, thus utilize the second order law of buoyancy of magnetic liquid make mass block suspend in the housing.When extraneous vibration, the relative movement between mass block and housing causes in the gap of magnetic liquid between mass block and housing flows, thus produces viscous loss.Vibration damper described in this patent make use of the second order law of buoyancy of magnetic liquid; by be full of in housing magnetic liquid make permanent magnet can stable suspersion in the housing; but glue effect due to the magnetic of magnetic liquid; after magnetic liquid is full of housing; permanent magnet will slowly in enclosure interior motion, and effectiveness in vibration suppression is bad.Secondly, because mass block is permanent magnet, housing is common cylinder tubbiness, therefore mass block weight and restoring force size all non-adjustable, therefore in engineer applied, not there is practicability.
Damper means described in documents 2 (what publication number was CN104074903A applies for a patent), this vibration damper comprises non-magnetic housing, bolt, nut, permanent magnet, magnetic liquid, non-magnetic shell, O type circle, pore, annular space etc.This application patent is also as mass block using permanent magnet, a small amount of magnetic liquid is adsorbed at permanent magnet two ends, utilize the second order law of buoyancy of magnetic liquid that permanent magnet is suspended, make magnetic liquid produce elastic force by inner walls being processed into arc-shaped, thus make permanent magnet be in the center of housing all the time.Meanwhile, this structure does not need magnetic liquid to be full of whole housing yet, thus the magnetic liquid avoiding documents 1 be full of after flow difficulties problem at permanent magnet two ends.But when mass block moves, to deflection be there is in whole mass block, cause mass block bottom surface and housing arc inner wall generation scratch phenomenon, cause effectiveness in vibration suppression not obvious, this patent pore used needs peace to connect overcoat simultaneously, complex structure, causes whole vibration damper quality to increase, does not therefore have practicability.
Damper means described in documents 3 (what publication number was CN102042359A applies for a patent), this vibration damper and the apparatus structure described in documents 1 similar, but documents 3 is processed with 4 ~ 8 through holes on permanent magnet, it is more smooth and easy that this through hole can make magnetic liquid flow, and increase friction area.But, because magnetic liquid is full of whole chamber, and magnetic field, permanent magnet two ends is very strong, that magnetic liquid in through hole or the magnetic liquid between permanent magnet and housing all can cannot proper flow because viscosity is excessive, therefore on permanent magnet, process the effect of through hole and not obvious, therefore not there is practicability.
Damper means described in documents 4 (publication number CN102494070A applies for a patent), described in this vibration damper principle and documents 1, principle of device is similar, but described in this patent, housing is processed conglobate hollow ball-shape by device, and permanent magnet is processed into solid spherical.But simple alteration of form can not solve the problem of magnetic liquid flow difficulties between permanent magnet and housing, does not therefore have practicability.
Vibration damper described in documents 5 (publication number JP11-230255A applies for a patent), this vibration damper is a kind of vibration damper for shaft vibration, and it utilizes the second order law of buoyancy of magnetic liquid, using permanent magnet as a gyrating mass block.This patent also cannot solve the problem of magnetic liquid flow difficulties between permanent magnet and housing, does not therefore have practicability.
Damper means described in documents 6 (publication number CN103122965A applies for a patent), this vibration damper is a kind of vibration damper for cutting down solar energy sailboard vibration, it makes use of the second order law of buoyancy of magnetic liquid, mass block is annular permanent magnet.This patent is by keeping the middle position of permanent magnet with the pad of band cone angle, but when cylindrical permanent magnet is moved at housing bottom, because run-off the straight causes permanent magnet and pad to scratch by the effect of cone angle pad, viscosity power consumption reduces, and therefore there is some problems in actual applications.
Damper means described in documents 7 (publication number JP11-223247A applies for a patent), this vibration damper is a kind of vibration damper for cutting down shaft vibration, it makes use of the single order law of buoyancy of magnetic liquid, mass block is annular no permeable material, rotating shaft is installed a circle permanent magnet mass block is not offset in circumference.But known by the single order law of buoyancy of magnetic liquid, it is unstable that independent one group of permanent magnet suspends to the material of non-magnetic, be easy to cause mass block producing skew and disturbance along rotating shaft axial direction, therefore this patent does not have use value.
Therefore be badly in need of redesigning the structure of magnetic fluid damper and improving, can be applied in Practical Project.
Model utility content
Technical problem to be solved in the utility model is, existing magnetic fluid damper causes the problems such as magnetic liquid flowing due to various structures defect, makes it cannot be applied in engineering reality.Spy provides a kind of outside cone angle magnetic fluid damper.
The technological scheme that the utility model technical solution problem adopts is:
A kind of outside cone angle magnetic fluid damper, this device comprises left shell, magnetic liquid, permanent magnet, right shell body, vent slot.
Described left shell, right shell body are provided with endoporus, and left shell endoporus is the from left to right taper hole that increases gradually of diameter, and right shell body endoporus is the taper hole that increases gradually of diameter from right to left, and endoporus attachment portion is isodiametric through hole, and endoporus hole wall has vent slot; Permanent magnet is injected a certain amount of magnetic liquid; Described left shell is fixedly connected with right shell body.
Described left shell, right shell body are non-permeable material, the cone angle 5 °≤θ <90 ° of its endoporus left and right two ends taper hole, endoporus vent slot quantity is 2 ~ 6, be uniformly distributed along endoporus circumferencial direction, the cross section gross area of all vent slots is left shell, right shell body middle interconnecting piece plane amasss 1/8 ~ 1/3, the height of vent slot is greater than the height that magnetic liquid enters vent slot.The taper hole of left shell, right shell body can provide a certralizing ability to permanent magnet, makes permanent magnet in vibration processes, be subject to the centering power of a sensing symmetry center all the time.Vent slot can guarantee the circulation of chamber both sides gas, when more than at least 2 circumferentially equally distributed vent slot can prevent prior art (described in documents 2 and 8 device) from using on ground, make magnetic liquid block vent slot due to gravity effect or reduce the area of vent slot, affecting the movement velocity of permanent magnet.
The difference of the length of described vent slot and the length of permanent magnet should be greater than the amplitude of twice.The Design of length of vent slot can effectively prevent when reaching peak swing, and permanent magnet moves to without vent slot area, chamber pressure at two ends is balanced and is broken, thus cannot recenter.
Described permanent magnet diameter is less than the diameter of left shell left side, right shell body right side.The size of permanent magnet effectively can prevent the scratch problem of permanent magnet and housing in movement process.
The present invention compares had beneficial effect with prior art as follows: the taper hole of (1) left shell, right shell body can provide a certralizing ability to permanent magnet, makes permanent magnet in vibration processes, be subject to the centering power of a sensing symmetry center all the time; (2) vent slot can guarantee the circulation of chamber both sides gas, more than at least 2 circumferentially equally distributed vent slot prior art can be prevented when ground uses, make magnetic liquid block vent slot due to gravity effect or reduce the area of vent slot, affect the movement velocity of permanent magnet, the Design of length of vent slot can effectively prevent when reaching peak swing, permanent magnet moves to without vent slot area, chamber pressure at two ends is balanced and is broken, thus cannot recenter; (3) size of permanent magnet effectively can prevent the scratch problem of permanent magnet and housing in prior art.
Accompanying drawing explanation
A kind of outside cone angle magnetic fluid damper of Fig. 1;
Side view when Fig. 2 housing vent groove quantity is 2;
Side view when Fig. 3 housing vent groove quantity is 4;
Side view when Fig. 4 housing vent groove quantity is 6.
In Fig. 1: left shell 1, magnetic liquid 2, permanent magnet 3, right shell body 4, vent slot 5.
Embodiment
Be that the invention will be further described for embodiment with accompanying drawing:
A kind of outside cone angle magnetic fluid damper, as Fig. 1, this vibration damping equipment comprises: shell left shell 1, magnetic liquid 2, permanent magnet 3, right shell body 4, vent slot 5.
Connection between each several part forming this device:
First on permanent magnet 3, inject enough magnetic liquids 2.Putting into injecting the permanent magnet 3 of magnetic liquid 2 housing that left shell 1 and right shell body 4 formed, being fixedly connected with by left and right housing, Placement is bonding, mode of welding or to be threaded etc.
Described left shell 1 and right shell body 4 all select non-permeable material.
Claims (4)
1. an outside cone angle magnetic fluid damper, is characterized in that: left shell (1), magnetic liquid (2), permanent magnet (3), right shell body (4), vent slot (5); Described left shell (1), right shell body (4) are provided with endoporus, left shell (1) endoporus is the from left to right taper hole that increases gradually of diameter, right shell body (4) endoporus is the taper hole that increases gradually of diameter from right to left, endoporus attachment portion equal diameters, left and right shell construction size is identical, and endoporus hole wall has vent slot (5); At permanent magnet (3) a certain amount of magnetic liquid of upper injection (2); Described left shell (1) is fixedly connected with right shell body (4).
2. a kind of outside cone angle magnetic fluid damper according to claim 1, is characterized in that:
Described left shell (1), right shell body (4) are non-permeable material, the cone angle 5 °≤θ <90 ° of its endoporus left and right two ends taper hole, endoporus vent slot quantity is 2 ~ 6, be uniformly distributed along endoporus circumferencial direction, the cross section gross area of all vent slots (5) is left shell (1), right shell body (4) middle interconnecting piece plane amasss 1/8 ~ 1/3, the height of vent slot (5) is greater than the height that magnetic liquid (2) enters vent slot (5).
3. a kind of outside cone angle magnetic fluid damper according to claim 1 and 2, is characterized in that:
Length and the difference of the length of power consumption permanent magnet (3) of described vent slot (5) should be greater than the amplitude of twice.
4. a kind of outside cone angle magnetic fluid damper according to claim 1, is characterized in that:
Described permanent magnet (3) diameter is less than the diameter of left shell (1) left side and right shell body (4) right side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520056528.0U CN204419958U (en) | 2015-01-27 | 2015-01-27 | A kind of outside cone angle magnetic fluid damper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520056528.0U CN204419958U (en) | 2015-01-27 | 2015-01-27 | A kind of outside cone angle magnetic fluid damper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204419958U true CN204419958U (en) | 2015-06-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520056528.0U Expired - Fee Related CN204419958U (en) | 2015-01-27 | 2015-01-27 | A kind of outside cone angle magnetic fluid damper |
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| CN (1) | CN204419958U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105156568A (en) * | 2015-07-20 | 2015-12-16 | 常州大学 | Double-rod variable-cylinder-body passive double-control variable-damping magnetorheological damper |
| CN106679697A (en) * | 2016-12-30 | 2017-05-17 | 北京交通大学 | External taper angle magnetic liquid inertia sensor utilizing rectangular permanent magnets |
| CN112392884A (en) * | 2020-11-11 | 2021-02-23 | 清华大学 | Magnetic liquid shock absorber based on second-order buoyancy principle |
-
2015
- 2015-01-27 CN CN201520056528.0U patent/CN204419958U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105156568A (en) * | 2015-07-20 | 2015-12-16 | 常州大学 | Double-rod variable-cylinder-body passive double-control variable-damping magnetorheological damper |
| CN106679697A (en) * | 2016-12-30 | 2017-05-17 | 北京交通大学 | External taper angle magnetic liquid inertia sensor utilizing rectangular permanent magnets |
| CN112392884A (en) * | 2020-11-11 | 2021-02-23 | 清华大学 | Magnetic liquid shock absorber based on second-order buoyancy principle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150624 Termination date: 20210127 |
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| CF01 | Termination of patent right due to non-payment of annual fee |