JP2022077488A - Magnetic fluid damper based on principle of secondary buoyance - Google Patents

Abstract

To provide a magnetic fluid damper in which a permanent magnet is hardly crushed, is easy to process, and has a high vibration absorbing effect.SOLUTION: There is disclosed a magnetic fluid damper based on the principle of secondary buoyance and having a plurality of permanent magnets 210, 220 and a porous medium member 310 inside a housing 100 defining a cavity, in which the porous medium member 310 is located between two adjacent permanent magnets 210, 220 in a first direction, and voids of the porous medium member 310 are filled with a magnetic fluid 610. The magnetic damper includes a plurality of restoration parts 410, 420 in which restoring forces received by the two permanent magnets are not equal. The magnetic fluid damper based on the principle of secondary buoyancy according to an embodiment of the present invention has an advantage that the vibration absorption effect is good and the vibration absorption effect is stable.SELECTED DRAWING: Figure 1

Description

The present invention relates to the field of mechanical engineering vibration, specifically to a ferrofluid damper based on the principle of secondary buoyancy.

In the field of space flight, spacecraft are energy constrained, so it is very appropriate to adopt passive dampers, especially low frequency, small amplitude vibrations caused by long, straight objects in the spacecraft, for example. Vibration of antennas and solar panels is a difficult task for vibration absorption. Magnetic fluid dampers are passive dampers that consume zero energy, are sensitive to inertial forces, have a simple structure, have a fast vibration absorption rate, and have a long service life, and are suitable for low-frequency, small-amplitude vibrations. Therefore, it is suitable for low frequency and small amplitude vibration of long and straight objects, especially in the field of space flight. In addition, the magnetic fluid damper is expected to be widely applied to ground systems such as vibration isolation tables and vibration absorption of high-power antennas.

The conventional magnetic fluid damper is mainly a damper based on the principle of secondary buoyancy, and the main form is that the vibration absorption mass block is a permanent magnet, and fluid shear is generated by the relative motion of the permanent magnet and the magnetic fluid, and the viscosity causes it. It achieves the role of consuming energy, and is, for example, Document 1 (application patent of publication number CN104074903A), Document 2 (application patent of publication number CN102032304A), Document 3 (publication number CN103122960A), and the like. Principle of secondary buoyancy Many dampers have the following drawbacks. 1. 1. Despite the high brittleness of the permanent magnet material, the spacecraft may experience extremely high acceleration during launch, causing collisions and crushing the permanent magnets. 2. 2. The improvement of the damper effect is usually based on changes in the shape of the permanent magnet, but it is difficult to process the permanent magnet. 3. 3. There are few friction surfaces that have a vibration absorption effect, and the vibration absorption effect is poor.

It is an object of the present invention to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiments of the present invention propose a ferrofluid damper based on the principle of secondary buoyancy.

The magnetic fluid damper based on the principle of secondary buoyancy according to the embodiment of the present invention is
A housing that defines a cavity and has a first wall and a second wall that face each other in the first direction.
A plurality of permanent magnets and at least one first porous medium member, wherein the at least one first porous medium member and the plurality of permanent magnets are alternately arranged in the cavity along a first direction. Arranged, each said first porous medium member is located between two adjacent permanent magnets in the first direction, and each said first porous medium member corresponds to two adjacent said. A plurality of permanent magnets provided on one of the permanent magnets, wherein the voids of each of the first porous medium members are filled with the first magnetic fluid and at least one first porous medium member. When,
A plurality of return portions that are fitted to the plurality of permanent magnets on a one-to-one basis and apply a restoring force in a second direction to the permanent magnets, wherein the two adjacent portions in the first direction are adjacent to each other. Includes a plurality of return sections where the restoring forces received by the permanent magnets are not equal.

The magnetic fluid damper based on the principle of secondary buoyancy according to the embodiment of the present invention has an advantage that the vibration absorption effect is good and the vibration absorption effect is stable.

In some embodiments, the plurality of permanent magnets includes a first permanent magnet and a second permanent magnet, and the plurality of return portions include a first return portion and a second return portion, wherein the return portion includes the first permanent magnet and a second permanent magnet. The first return portion is fitted to the first permanent magnet, and the second return portion is fitted to the second permanent magnet.

In some embodiments, the plurality of permanent magnets further comprises at least one third permanent magnet, wherein the at least one third permanent magnet is the first permanent magnet in the first direction. Located between the second permanent magnet and the second permanent magnet, the plurality of return portions further include at least one third return portion, and the at least one third return portion is the at least one third return portion. It is fitted to the permanent magnet of No. 1 on a one-to-one basis.

In some embodiments, the first return portion is a first elastic member, the second return portion is a second elastic member, and the first elastic member and the second elastic member. Are each located in the cavity.

In some embodiments, the first elastic member is a first scroll spring, the first scroll spring being fitted into at least a portion of the first permanent magnet, the second. The elastic member is a second scroll spring, and the second scroll spring is fitted to at least a part of the second permanent magnet.

In some embodiments, the first return portion is a first groove, the second return portion is a second groove, and the first groove is formed on the first wall surface. The second groove is formed on the second wall surface, the size of the opening of the first groove in the second direction is larger than that of the bottom of the first groove, and the opening of the second groove has a size larger than that of the bottom of the first groove. The size in the second direction is larger than the bottom of the second groove, the second magnetic fluid is filled between the first groove and the first permanent magnet, and the second magnetic fluid is said. It is attracted to the first permanent magnet, the second magnetic fluid comes into contact with the first groove, and the third magnetic fluid is filled between the second groove and the second permanent magnet. The third magnetic fluid is attracted to the second permanent magnet, the third magnetic fluid comes into contact with the second groove, and the first groove can be selected in the second direction. It has a first side wall and a second side wall that face each other, the first side wall has a first end and a second end in the second direction, and the second side wall has the second side wall. It has a third end and a fourth end in the direction, the second end close to the bottom of the first groove, the third end close to the bottom of the first groove, said The first end is located inside the second end, the fourth end is located inside the third end, and the first permanent magnet is located inside the first end in the second direction. Located between the end of the ferrofluid and the fourth end of the ferrofluid
The second groove has a third side wall and a fourth side wall facing each other in the second direction, and the third side wall has a fifth end and a sixth end in the second direction. The fourth side wall has a seventh end and an eighth end in the second direction, the sixth end is close to the bottom of the second groove, and the seventh end. Is close to the bottom of the second groove, the fifth end is located inside the sixth end, the eighth end is located inside the seventh end, and the second end. A permanent magnet is located between the fifth end and the eighth end in the second direction.

In some embodiments, the first groove is conical or conical trapezoidal and the second groove is conical or conical trapezoidal.

In some embodiments, one of the first return portion and the second return portion is a scroll spring, and the other of the first return portion and the second return portion is a groove. The groove is formed in one of the first wall surface and the second wall surface, the scroll spring member is located in the cavity, and the scroll spring is the first permanent magnet and the second permanent magnet. Fitted into at least one of the permanent magnets of the groove, the size of the opening of the groove in the second direction is larger than the bottom of the groove, the groove and the first permanent magnet and the second. A magnetic fluid is filled between the permanent magnet and the other of the permanent magnets, the magnetic fluid is attracted to the other of the first permanent magnet and the second permanent magnet, and the magnetic fluid comes into contact with the groove. ,
Optionally, the groove is conical or trapezoidal.

In some embodiments, each of the third return portions is a third elastic member, and each of the third return portions is located in the cavity and is selectably the third elastic member. 3 scroll springs, wherein the third scroll spring is fitted to at least a portion of the corresponding third permanent magnet.

The magnetic fluid damper based on the principle of secondary buoyancy according to the embodiment of the present invention is
In the second porous medium member, the first permanent magnet is located between the first porous medium member and the first wall surface, and the second porous medium member is the second. Located between the permanent magnet 1 and the first wall surface, the second porous medium member is provided in the first permanent magnet, where the voids of the second porous medium member are filled. A second porous medium member filled with a second magnetic fluid, and
In the third porous medium member, the second permanent magnet is located between the first porous medium member and the second wall surface, and the third porous medium member is the first. Located between the permanent magnet 2 and the second wall surface, the third porous medium member is provided in the second permanent magnet, where the voids of the third porous medium member are filled. It further comprises a third porous medium member, which is filled with a third magnetic fluid.

In some embodiments, the first porous medium member, the second porous medium member, and the third porous medium member are made of at least one of sponge, foamed carbon, and foamed copper. It is made.

It is a schematic structural drawing of the magnetic fluid damper based on the principle of secondary buoyancy which concerns on embodiment of this invention. It is a schematic structural drawing of the magnetic fluid damper based on the principle of secondary buoyancy which concerns on embodiment of this invention. It is a schematic structural drawing of the magnetic fluid damper based on the principle of secondary buoyancy which concerns on embodiment of this invention.

Hereinafter, examples of the present invention will be described in detail. An example in the above embodiment is shown in the drawings. Hereinafter, the examples described with reference to the drawings are illustrative and are intended to illustrate the invention and should not be understood as limiting the invention.

Hereinafter, the magnetic fluid damper 1000 based on the principle of secondary buoyancy according to the embodiment of the present invention will be described with reference to the drawings, and as shown in FIGS. 1 and 2, the secondary buoyancy according to the embodiment of the present invention will be described. The ferrofluid damper 1000 based on the above principle includes a housing 100, a plurality of permanent magnets, at least one first porous medium member 310, and a plurality of return portions.

The housing 100 defines a cavity 110, the housing 100 includes a cover 101 and a case body 102, and the housing 100 has a first wall surface 112 and a second wall surface 112 facing the surrounding wall surface 111 in a first direction. It has a wall surface 113, and a peripheral wall surface 111 is located between the first wall surface 112 and the second wall surface 113. At least one first porous medium member 310 and a plurality of permanent magnets are alternately arranged in the cavity 110 along the first direction, and each first porous medium member 310 is adjacent in the first direction. Located between the two permanent magnets, each first porous medium member 310 is provided on one of two corresponding adjacent permanent magnets, where the voids in each first porous medium member 310. Is filled with the first magnetic fluid 610.

A plurality of return parts are fitted to a plurality of permanent magnets on a one-to-one basis to apply a restoring force in the second direction to the permanent magnets, where the restoring force received by two adjacent permanent magnets in the first direction. Are not equal.

The magnetic fluid damper 1000 based on the principle of secondary buoyancy according to the embodiment of the present invention is provided with a plurality of return portions, and the restoring force received by two adjacent permanent magnets in the first direction in the second direction is applied. Not equal. When a plurality of permanent magnets move due to the influence of mechanical energy due to vibration, the plurality of return parts are fitted to the plurality of permanent magnets on a one-to-one basis. After contact, the return can apply a restoring force to the permanent magnet fitted to it in a second direction. Since the restoring forces received by two adjacent permanent magnets in the first direction are not equal, the two adjacent permanent magnets in the first direction can move relatively.

Since each first porous medium member 310 is provided on one of two corresponding adjacent permanent magnets, each first porous medium member 310 and the corresponding other permanent magnet move relative to each other. be able to. Moreover, since the void of the first porous medium member 310 is filled with the first magnetic fluid 610, a part of the first magnetic fluid 610 is attracted by the other permanent magnet, and the corresponding first magnetic fluid 610 is filled. It moves relative to the porous medium member 310.

For example, the restoring force received by the second permanent magnet is smaller than the restoring force received by the first permanent magnet, and the vibration displacement of the second permanent magnet is larger than the vibration displacement of the first permanent magnet. The second permanent magnet drives a part of the first ferrofluid 610 to move fast together with the second permanent magnet 220. Since the first permanent magnet is fixed so that a part of the magnetic fluid does not move, the first magnetic fluid 610 has a magnetic fluid layer having a velocity gradient, and the first magnetic fluids 610 having different moving speeds have each other. It is sheared and rubbed, converting mechanical energy into thermal energy, allowing the first ferrofluid 610 to consume energy by viscous, improving the vibration absorption effect. Due to the presence of voids in the first porous medium member 310, the solid-liquid contact area increases, the velocity gradient in the first magnetic fluid 610 increases, and the energy consumption due to friction and the energy consumption due to viscosity increase. , The vibration absorption effect is further improved.

Further, the flow velocity of the first magnetic fluid 610 passing through the different voids of the first porous medium member 310 is different, and when the first magnetic fluids 610 having different flow paths meet, they are sheared and rubbed against each other to heat mechanical energy. It is converted into energy so that the inside of the first magnetic fluid 610 consumes energy due to its viscosity, further improving the vibration absorbing effect.

Therefore, the magnetic fluid damper 1000 based on the principle of secondary buoyancy according to the embodiment of the present invention has an advantage that the vibration absorption effect is good and the vibration absorption effect is stable.

The ferrofluid damper 1000 based on the principle of secondary buoyancy according to the embodiment of the present invention includes a housing 100, a plurality of permanent magnets, at least one first porous medium member 310, and a plurality of return portions. including.

The housing 100 defines a cavity 110, the housing 100 includes a cover 101 and a case body 102, and the housing 100 has a first wall surface 112 and a second wall surface 112 facing the surrounding wall surface 111 in a first direction. It has a wall surface 113.

At least one first porous medium member 310 and a plurality of permanent magnets are alternately arranged in the cavity 110 along the first direction, and each first porous medium member 310 is adjacent in the first direction. Located between two permanent magnets, each first porous medium member 310 is provided on one of two corresponding adjacent permanent magnets, i.e. the first porous medium member 310 and one permanent magnet. And can be moved synchronously. Here, the voids of each first porous medium member 310 are filled with the first magnetic fluid 610.

A plurality of return parts are fitted to a plurality of permanent magnets on a one-to-one basis to apply a restoring force in the second direction to the permanent magnets, where the restoring force received by two adjacent permanent magnets in the first direction. Are not equal.

For example, the first direction may be a vertical direction, and the second direction may be a horizontal direction. The vertical direction is indicated by the arrow A in FIG. 1, and the horizontal direction is indicated by the arrow B in FIG.

In some embodiments, the plurality of permanent magnets includes a first permanent magnet 210 and a second permanent magnet 220, and the plurality of return sections include a first return section and a second return section. That is, the number of permanent magnets is two, where one permanent magnet is the first permanent magnet 210 and the other permanent magnet is the second permanent magnet 220. The number of the first porous medium member 310 is one, the first porous medium member 310 is located between the first permanent magnet 210 and the second permanent magnet 220, and the first porous medium member 310 is located. The medium member 310 is provided on one of the first permanent magnet 210 and the second permanent magnet 220. The number of return units is two, where one return unit is the first return unit and the other return unit is the second return unit. The first return portion is fitted to the first permanent magnet 210, that is, the first return portion applies a first restoring force in the second direction to the first permanent magnet 210. The second return portion is fitted to the second permanent magnet 220, that is, the second return portion applies a second restoring force in the second direction to the second permanent magnet 220.

In some embodiments, the first return portion is a first elastic member, the second return portion is a second elastic member, and the first elastic member and the second elastic member are cavities 110, respectively. Located inside. Specifically, the first elastic member is the first scroll spring 410, and the first scroll spring 410 is fitted to at least a part of the first permanent magnet 210. The second elastic member is a second scroll spring 420, in which the second scroll spring 420 is fitted into at least a portion of the second permanent magnet 220.

The amplitude of the permanent magnet of the ferrofluid damper 1000 based on the principle of secondary buoyancy according to the embodiment of the present invention does not reach the limit of scroll spring compression.

As shown in FIG. 1, in some embodiments, the first elastic member and the second elastic member are adjacent to each other, and the rigidity of the first elastic member is not equal to the rigidity of the second elastic member. For example, the stiffness of the first scroll spring 410 is not equal to the stiffness of the second scroll spring 420. As a result, the first restoring force applied to the first permanent magnet 210 by the first elastic member and the second restoring force applied to the second permanent magnet 220 by the second elastic member are different. As a result, the first permanent magnet 210 and the second permanent magnet 220 move relatively.

For example, the second restoring force is smaller than the first restoring force, and the vibration displacement of the second permanent magnet 220 is larger than the vibration displacement of the first permanent magnet 210. The second permanent magnet drives a part of the first ferrofluid 610 to move fast together with the second permanent magnet 220. Since the first permanent magnet is fixed so that a part of the magnetic fluid does not move, a magnetic fluid layer having a velocity gradient exists in the first magnetic fluid 610, and the first magnetic fluids 610 having different moving speeds are attached to each other. It is sheared and rubbed, converting mechanical energy into thermal energy, allowing the first ferrofluid 610 to consume energy by viscous, improving the vibration absorption effect.

Due to the presence of voids in the first porous medium member 310, the solid-liquid contact area increases and the velocity gradient in the first magnetic fluid 610 increases, resulting in energy consumption due to friction and energy consumption due to viscosity. It increases and the vibration absorption effect is further improved.

As shown in FIG. 2, in some embodiments, the first return portion is the first groove 510, the second return portion is the second groove 520, and the first wall surface 112 is the first. The groove 510 is formed, and the second groove 520 is formed on the second wall surface 113. The size of the opening of the first groove 510 in the second direction is larger than the bottom of the first groove 510, and the size of the opening of the second groove 520 in the second direction is larger than the size of the opening of the second groove 520 from the bottom of the second groove 520. Largely, the first groove 510 and the second groove 520 face each other in the first direction.

Optionally, the first groove 510 has a first side wall 511 and a second side wall 512 facing each other in the second direction, i.e., the first side wall 511 is on the left wall of the first groove 510. The second side wall 512 is the right wall of the first groove 510.

The first side wall 511 has a first end and a second end in the second direction. The first end is the left end of the first side wall 511 and the second end is the right end of the first side wall 511. The second side wall 512 has a third end and a fourth end in the second direction. The third end is the left end of the second side wall 512 and the fourth end is the right end of the second side wall 512.

The second end is close to the bottom of the first groove 510 and the third end is close to the bottom of the first groove 510, that is, the second and third ends are the first in the left-right direction. It is located between the end of and the fourth end. The first end is located inside the second end and the fourth end is located inside the third end. The size of the opening of the first groove 510 in the first direction is larger than the bottom of the first groove 510.

In some embodiments, the first groove 510 is conical, i.e., the upper half edge of the cross section of the first groove 510 is V-shaped. In other words, the first side wall 511 and the second side wall 512 intersect, that is, the second end (right end) of the first side wall 511 and the third end (left end) of the second side wall 512. It is the same end.

Optionally, the first groove 510 is conical trapezoidal.

Optionally, the second groove 520 has a third side wall 521 and a fourth side wall 522 facing in the second direction, i.e. the third side wall 521 is the left wall of the second groove 520. The fourth side wall 522 is the right wall of the second groove 520.

The third side wall 521 has a fifth end and a sixth end in the second direction. The fifth end is the left end of the third side wall 521 and the sixth end is the right end of the third side wall 521. The fourth side wall 522 has a seventh end and an eighth end in the second direction. The seventh end is the left end of the fourth side wall 522 and the eighth end is the right end of the fourth side wall 522.

The sixth end is close to the bottom of the second groove 520 and the seventh end is close to the bottom of the second groove 520, that is, the sixth and seventh ends are the fifth in the left-right direction. It is located between the end of and the eighth end. The fifth end is located inside the sixth end, the eighth end is inside the seventh end (the inside refers to the side close to the center of the cavity 110, and the outside refers to the peripheral wall surface of the housing 100. (Pointing to the side close to 111). The size of the opening of the second groove 520 in the first direction is larger than the bottom of the second groove 520.

In some embodiments, the second groove 520 is conical, i.e., the lower half edge of the cross section of the second groove 520 is inverted V-shaped. In other words, the third side wall 521 and the fourth side wall 522 intersect, that is, the sixth end (right end) of the third side wall 521 and the seventh end (left end) of the fourth side wall 522. It is the same end.

Optionally, the second groove 520 is conical trapezoidal.

A second magnetic fluid 620 is filled between the first groove 510 and the first permanent magnet 210, the second magnetic fluid 620 is attracted to the first permanent magnet 210, and the second magnetic fluid 620 is generated. It comes into contact with the first groove 510. The first permanent magnet 210 is located between the first end and the fourth end in the second direction, whereby the first groove 510 has a constant position limitation with respect to the first permanent magnet 210. That is, the first permanent magnet 210 can move within the permissible range of the first groove 510.

A third magnetic fluid 630 is filled between the second groove 520 and the second permanent magnet 220, the third magnetic fluid 630 is attracted to the second permanent magnet 220, and the third magnetic fluid 630 is attracted to the second permanent magnet 220. Contact with the second groove 520. The second permanent magnet 220 is located between the fifth end and the eighth end in the second direction, whereby the second groove 520 has a constant position limitation with respect to the second permanent magnet 220. That is, the second permanent magnet 220 can move within the permissible range of the second groove 520.

In the above embodiment, the first groove 510 applies the first restoring force to the first permanent magnet 210. For example, when the first permanent magnet 210 undergoes vibration absorption displacement to the left, the second magnetic fluid 620 located between the first permanent magnet 210 and the first side wall 511 is pressed and the first. The magnetic force of the permanent magnet 210 causes the second magnetic fluid 620 to apply a first rightward acting force to the first permanent magnet 210, and the first acting force causes the first permanent magnet 210 to perform the first acting force. The speed at which the first permanent magnet 210 approaches the first side wall 511 is slowed down until it begins to move to the right by the action of the force of the first permanent magnet 210. In this process, the second magnetic fluid 620 located between the first permanent magnet 210 and the first side wall 511 is pressed, so that viscous shear occurs inside the second magnetic fluid 620 and energy is consumed. do.

Similarly, the second side wall 512 can apply a second leftward acting force to the first permanent magnet 210. Both such a first acting force and a second acting force can be regarded as a restoring force capable of returning the first permanent magnet 210 to its equilibrium position, and the equilibrium position here is the first. It refers to the position when the permanent magnet 210 of 1 does not perform the vibration absorbing motion, and at this time, the first permanent magnet 210 and the housing 100 are relatively stationary.

Similarly, the third side wall 521 and the fourth side wall 522 can also return the second permanent magnet 220 to its equilibrium position, and the taper of the first groove 510 is not equal to the taper of the second groove 520. Therefore, the first restoring force generated by the first groove 510 in the first permanent magnet 210 is not equal to the second restoring force generated by the second permanent magnet 220 second groove 520. As a result, the first permanent magnet 210 and the second permanent magnet 220 move relatively, and a part of the first magnetic fluid 610 and the first porous medium member 310 move relatively. , Improves vibration absorption effect.

In some embodiments, one of the first return portion and the second return portion is a scroll spring, and the scroll spring member is located in the cavity 110. The scroll spring is fitted to at least a part of one of the first permanent magnet 210 and the second permanent magnet 220.

The other of the first return portion and the second return portion is a groove, and the groove is formed on the other of the first wall surface 112 and the second wall surface 113. A magnetic fluid is filled between the groove and one of the first permanent magnet 210 and the second permanent magnet 220. The groove has an opening in the first direction, the size of the opening in the groove in the second direction is larger than the bottom of the groove, and the groove is conical or trapezoidal.

For example, when the first return portion is a scroll spring, the second return portion is a groove. A scroll spring is fitted into at least a portion of the first permanent magnet 210, and the scroll spring exerts a first restoring force on the first permanent magnet 210. A groove is formed in the second wall surface 113, and the groove applies a second restoring force to the second permanent magnet 220.

When the second return portion is a scroll spring, the first return portion is a groove. The scroll spring is fitted into at least a portion of the second permanent magnet 220, and the scroll spring exerts a first restoring force on the second permanent magnet 220. A groove is formed in the first wall surface 112, and the groove applies a second restoring force to the first permanent magnet 210.

As shown in FIG. 3, in some embodiments, the first permanent magnet 210 and the second permanent magnet 220 are adjacent to each other. The first return portion is the first scroll spring 410, and the first scroll spring 410 is fitted to at least a part of the first permanent magnet 210. The first scroll spring 410 applies a first restoring force to the first permanent magnet 210. The second return portion is a conical second groove 520. A third magnetic fluid 630 is filled between the second groove 520 and the second permanent magnet 220, and the second groove 520 applies a second restoring force to the second permanent magnet 220. By making the first restoring force equal to the second restoring force, the first permanent magnet 210 and the second permanent magnet 220 are relatively moved, that is, a part of the first magnetic fluid 610 and the first. The porous medium member 310 of 1 moves relatively, and the vibration absorption effect is improved.

In some embodiments, the plurality of permanent magnets further comprises at least one third permanent magnet, the at least one third permanent magnet having a first permanent magnet 210 and a second in the first direction. It is located between the permanent magnet 220 and the permanent magnet 220. The plurality of return portions further include at least one third return portion, and the at least one third return portion is fitted to the at least one third permanent magnet on a one-to-one basis, that is, a third return portion. The return section applies a third restoring force to the corresponding third permanent magnet. For example, when the number of the third permanent magnets is one, that is, when the number of permanent magnets is three, the number of the first porous medium members 310 is two, and the third return portion. Is one, and the third restoring force is not equal to the first restoring force and the second restoring force.

Each third return portion is a third elastic member, and each third return portion is located in the cavity 110. Optionally, the third elastic member is a third scroll spring, which is fitted into at least a portion of the corresponding third permanent magnet. The third scroll spring applies a third restoring force to the corresponding third permanent magnet.

When the number of the third permanent magnets is plural, here, the rigidity of the third elastic member adjacent to the first elastic member in the first direction is not equal to the rigidity of the first elastic member, for example. The first restoring force and third elasticity applied to the first permanent magnet 210 by the first elastic member because the stiffness of the first scroll spring 410 is not equal to the stiffness of the third scroll spring adjacent to it. The third restoring force applied to the third permanent magnet differs depending on the member. As a result, the first permanent magnet 210 and the third permanent magnet move relatively.

The rigidity of the third elastic member adjacent to the second elastic member in the first direction is not equal to the rigidity of the second elastic member, for example, the rigidity of the second scroll spring 420 becomes the rigidity of the third scroll spring. Because they are not equal, the second restoring force applied to the second permanent magnet 220 by the second elastic member and the third restoring force applied to the third permanent magnet by the third elastic member are not equal. As a result, the second permanent magnet 220 and the third permanent magnet move relatively.

In some embodiments, the stiffness of two adjacent third elastic members in the first direction is not equal. For example, because the stiffness of two adjacent third springs in the first direction is not equal, the third restoring force applied to the corresponding third permanent magnet by the two adjacent third elastic members is equal. not. This causes the two adjacent third permanent magnets to move relatively.

Due to the relative movement of the two adjacent permanent magnets, the part of the first ferrofluid 610 between the two adjacent permanent magnets and the corresponding first porous medium member 310 move relatively. And improve the vibration absorption effect.

As shown in FIGS. 1 and 2, in some embodiments, the ferrofluid damper 1000 based on the principle of secondary buoyancy according to the embodiment of the present invention has a second porous medium member 320 and a third porous. Further includes a quality medium member 330.

The first permanent magnet 210 is located between the first porous medium member 310 and the first wall surface 112, and the second porous medium member 320 has the first permanent magnet 210 and the first wall surface 112. Located between. The second porous medium member 320 is provided on the first permanent magnet 210, that is, the second porous medium member 320 moves together with the first permanent magnet 210. Here, the void of the second porous medium member 320 is filled with the second magnetic fluid 620.

When the first permanent magnet 210 moves, the first permanent magnet 210 drives a part of the second magnetic fluid 620 to move fast together with the first permanent magnet 210. A part of the second ferrofluid 620 in contact with the first wall surface 112 does not move or moves slowly. As a result, the second magnetic fluid 620 has a magnetic fluid layer having a velocity gradient, and the second magnetic fluids 620 having different moving speeds shear and rub against each other to convert mechanical energy into thermal energy. , The second magnetic fluid 620 consumes energy due to its viscosity, and improves the vibration absorbing effect.

Due to the presence of voids in the second porous medium member 320, the solid-liquid contact area increases, the velocity gradient in the second magnetic fluid 620 increases, and the energy consumption due to friction and the energy consumption due to viscosity increase. , The vibration absorption effect is further improved.

Further, the flow velocity of the second magnetic fluid 620 passing through the different voids of the second porous medium member 320 is different, and when the second magnetic fluids 620 having different flow paths meet, they are sheared and rubbed against each other to heat the mechanical energy. It is converted into energy so that the inside of the second magnetic fluid 620 consumes energy due to its viscosity, further improving the vibration absorbing effect.

By accommodating the second magnetic fluid 620 in the voids of the second porous medium member 320, the volatilization of the second magnetic fluid 620 can be reduced and the vibration absorption effect of the magnetic fluid damper can be further stabilized. ..

The third porous medium member 330 and the second permanent magnet 220 are located between the first porous medium member 310 and the second wall surface 113, and the third porous medium member 330 is the second permanent. Located between the magnet 220 and the second wall surface 113, a third porous medium member 330 is provided on the second permanent magnet 220, that is, the third porous medium member 330 is a second permanent magnet. Move with 220. Here, the void of the third porous medium member 330 is filled with the third magnetic fluid 630.

When the second permanent magnet 220 moves, the second permanent magnet 220 drives a part of the third magnetic fluid 630 to move faster together with the second permanent magnet 220. A part of the third magnetic fluid 630 that comes into contact with the second wall surface 113 does not move or moves slowly. As a result, a magnetic fluid layer having a velocity gradient exists in the third magnetic fluid 630, and the third magnetic fluids 630 having different moving speeds shear and rub against each other, converting mechanical energy into thermal energy, and the second. The magnetic fluid 620 of No. 2 consumes energy due to its viscosity, and the vibration absorption effect is improved. Further, the flow velocity of the third magnetic fluid 630 passing through the different voids of the third porous medium member 330 is different, and when the third magnetic fluids 630 having different flow paths meet, they are sheared and rubbed against each other to heat the mechanical energy. It is converted into energy so that the inside of the third magnetic fluid 630 consumes energy due to its viscosity, further improving the vibration absorbing effect.

By accommodating the third magnetic fluid 630 in the voids of the third porous medium member 330, the volatilization of the third magnetic fluid 630 is reduced, and the vibration absorption effect of the magnetic fluid damper is made more stable. can do.

In some embodiments, the first porous medium member 310, the second porous medium member 320 and the third porous medium member 330 are from at least one of sponge, foamed carbon, and foamed copper. Become. As a result, the first porous medium member 410, the second porous medium member 420, and the third porous medium member 430 have elasticity, and the permanent magnet and the housing 100 collide with each other and are damaged. Can be prevented.

In the description of the present invention, "center", "vertical", "horizontal", "length", "width", "thickness", "top", "bottom", "front", "rear", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axial", "Diameter" The orientation or positional relationship indicated by terms such as "direction" and "circumferential direction" is based on the orientation or positional relationship shown in the drawings, and is merely for the purpose of explaining the present invention conveniently and concisely. It should be understood that it should not be understood as limiting the invention as it does not instruct or imply that the device or component is always in a particular orientation and is structured and operated in a particular orientation. ..

Also, the terms "first" and "second" are used only to explain the purpose and either indicate or imply relative importance or imply the number of technical features shown. Do not understand as an instruction to. Thus, the features limited by the "first", "second" can include one or more of the features, either explicitly or implicitly. In the description of the present invention, "plural" means two or more, such as two or three, unless there is a clear and specific limitation.

In the present invention, the terms "attachment", "connect", "connection", "fixed" and the like should be understood in a broad sense, unless expressly specified and limited, for example, a fixed connection. It may be a detachable connection, an integrated connection, a mechanical connection, an electrical connection, or communication with each other. It may be directly connected, or indirectly connected via an intermediate medium, and unless expressly limited, the communication inside the two elements or the mutual communication of the two elements may be performed. It may be an action relationship. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood based on specific circumstances.

In the present invention, unless otherwise specified and limited, the fact that the first feature is "above" or "below" the second feature means that the first and second features are in direct contact with each other. Alternatively, the first and second features may be indirectly in contact with each other via the intermediate medium. Also, the fact that the first feature is "above", "above", and "top" of the second feature means that the first feature is directly above or diagonally above the second feature. Well, or only shows that the horizontal height of the first feature is higher than that of the second feature. The fact that the first feature is "below", "below" and "bottom surface" of the second feature may mean that the first feature is directly below or diagonally below the second feature. It only shows that the horizontal height of the first feature is smaller than that of the second feature.

In the present invention, terms such as "one example", "partial example", "example", "concrete example", or "partial example" are used in accordance with the example or example. The specific features, structures, materials or properties described are included in at least one embodiment or example of the invention. In the present specification, the exemplary description of the above terms does not necessarily indicate the same embodiment or example. Also, the specific features, structures, materials or properties described may be adequately coupled in any one or more examples or examples. Moreover, one of ordinary skill in the art can combine and combine the features of the different embodiments or examples and the different embodiments or examples described herein, as long as they are not inconsistent with each other.

Although the examples of the present invention have been described above, the above-mentioned examples are merely examples and do not limit the present invention, and those skilled in the art can change the above-mentioned examples within the scope of the present invention. , Modifications, replacements and transformations can be made.

100 Housing 101 Cover 102 Case body 110 Cavity 111 Peripheral wall surface 112 First wall surface 113 Second wall surface 210 First permanent magnet 220 Second permanent magnet 310 First porous medium member 320 Second porous medium Member 330 Third porous medium member 410 First scroll spring 420 Second scroll spring 510 First groove 511 First side wall 512 Second side wall 520 Second groove 521 Third side wall 522 Fourth side wall Side wall 610 First magnetic fluid 620 Second magnetic fluid 630 Third magnetic fluid

Claims (10)

A ferrofluid damper based on the principle of secondary buoyancy,
A housing that defines a cavity and has a first wall and a second wall that face each other in the first direction.
A plurality of permanent magnets and at least one first porous medium member, wherein the at least one first porous medium member and the plurality of permanent magnets are alternately arranged in the cavity along a first direction. Arranged, each said first porous medium member is located between two adjacent permanent magnets in the first direction, and each said first porous medium member corresponds to two adjacent said. A plurality of permanent magnets provided on one of the permanent magnets and the voids of each of the first porous medium members are filled with the first magnetic fluid, and at least one first porous medium member.
A plurality of return portions that are fitted to the plurality of permanent magnets on a one-to-one basis and apply a restoring force in the second direction to the permanent magnets, and the two permanent magnets adjacent to each other in the first direction are Including a plurality of return parts having unequal restoring forces,
The plurality of permanent magnets include a first permanent magnet and a second permanent magnet, the plurality of return portions include a first return portion and a second return portion, and the first return portion is said. It is fitted to the first permanent magnet, and the second return portion is fitted to the second permanent magnet.
A ferrofluid damper based on the principle of secondary buoyancy. The plurality of permanent magnets further include at least one third permanent magnet, wherein the at least one third permanent magnet includes the first permanent magnet and the second permanent magnet in the first direction. Located between and, the plurality of return portions further comprises at least one third return portion, wherein the at least one third return portion is one-to-one with the at least one third permanent magnet. Fitted in,
A magnetic fluid damper based on the principle of secondary buoyancy according to claim 1. The first returning portion is a first elastic member, the second returning portion is a second elastic member, and the first elastic member and the second elastic member are respectively located in the cavity. do,
A magnetic fluid damper based on the principle of secondary buoyancy according to claim 1 or 2. The first elastic member is a first scroll spring, the first scroll spring is fitted to at least a part of the first permanent magnet, and the second elastic member is a second scroll spring. , The second scroll spring is fitted into at least a part of the second permanent magnet.
A magnetic fluid damper based on the principle of secondary buoyancy according to claim 3. The first return portion is a first groove, the second return portion is a second groove, the first groove is formed on the first wall surface, and the first groove is formed on the second wall surface. A second groove is formed, the size of the opening of the first groove in the second direction is larger than the bottom of the first groove, and the size of the opening of the second groove in the second direction is Larger than the bottom of the second groove, a second magnetic fluid is filled between the first groove and the first permanent magnet, and the second magnetic fluid is attracted to the first permanent magnet. Then, the second magnetic fluid comes into contact with the first groove, the third magnetic fluid is filled between the second groove and the second permanent magnet, and the third magnetic fluid is formed. It is attracted to the second permanent magnet, and the third magnetic fluid comes into contact with the second groove.
The first groove has a first side wall and a second side wall facing each other in the second direction, and the first side wall has a first end and a second end in the second direction. The second side wall has a third end and a fourth end in the second direction, the second end is close to the bottom of the first groove, and the third end. Is close to the bottom of the first groove, the first end is located inside the second end, the fourth end is located inside the third end, and the first end. A permanent magnet is located between the first end and the fourth end in the second direction.
The second groove has a third side wall and a fourth side wall facing each other in the second direction, and the third side wall has a fifth end and a sixth end in the second direction. The fourth side wall has a seventh end and an eighth end in the second direction, the sixth end is close to the bottom of the second groove, and the seventh end. Is close to the bottom of the second groove, the fifth end is located inside the sixth end, the eighth end is located inside the seventh end, and the second end. A permanent magnet is located between the fifth end and the eighth end in the second direction.
A magnetic fluid damper based on the principle of secondary buoyancy according to claim 2 or 3. The first groove is conical or conical trapezoidal, and the second groove is conical or conical trapezoidal.
A magnetic fluid damper based on the principle of secondary buoyancy according to claim 5. One of the first return portion and the second return portion is a scroll spring, and the other of the first return portion and the second return portion is a groove, and the first wall surface thereof. And the groove is formed in one of the second wall surfaces, the scroll spring member is located in the cavity, and the scroll spring is one of the first permanent magnet and the second permanent magnet. Fitted in at least partly, the size of the opening of the groove in the second direction is larger than the bottom of the groove, the groove and the other of the first permanent magnet and the second permanent magnet. A magnetic fluid is filled in between, the magnetic fluid is attracted to the other of the first permanent magnet and the second permanent magnet, and the magnetic fluid comes into contact with the groove.
The groove is conical or trapezoidal,
A magnetic fluid damper based on the principle of secondary buoyancy according to claim 1 or 2. Each of the third return portions is a third elastic member, each of the third return portions is located in the cavity, and the third elastic member is a third scroll spring. The scroll spring is fitted into at least a portion of the corresponding third permanent magnet.
A magnetic fluid damper based on the principle of secondary buoyancy according to claim 2. In the second porous medium member, the first permanent magnet is located between the first porous medium member and the first wall surface, and the second porous medium member is the second. Located between the permanent magnet 1 and the first wall surface, the second porous medium member is provided in the first permanent magnet, and the second is in the void of the second porous medium member. A second porous medium member filled with magnetic fluid,
In the third porous medium member, the second permanent magnet is located between the first porous medium member and the second wall surface, and the third porous medium member is the first. Located between the second permanent magnet and the second wall surface, the third porous medium member is provided in the second permanent magnet, and the third is in the void of the third porous medium member. A third porous medium member, which is filled with a magnetic fluid, further comprises.
A magnetic fluid damper based on the principle of secondary buoyancy according to claim 1 or 2. The first porous medium member, the second porous medium member, and the third porous medium member are made of at least one of sponge, foamed carbon, and foamed copper.
A magnetic fluid damper based on the principle of secondary buoyancy according to claim 9.

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