JP2799118B2 - Dynamic vibration absorber type vibration damping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamic vibration absorber type damper which can obtain a vibration damping effect in two-dimensional horizontal direction by using one movable weight regardless of the direction among vibration damping devices for structures. It relates to a vibration device.

[0002]

2. Description of the Related Art A conventional dynamic vibration absorber type vibration damping device has a configuration in which a vibration direction of a structure to be damped is specified and an additional weight is vibrated so as to exert a vibration damping effect in that direction. Therefore, when there are a plurality of vibration directions to be damped, it is necessary to install the dynamic vibration absorbers in a number corresponding to each direction.

FIG. 3 schematically shows an installation state of a conventional dynamic vibration absorber type vibration damping device.
1 is added to the rigid element 10 corresponding to the vibration direction
3 and a plurality of dynamic vibration absorbers supported by the damping element 104.

FIG. 4 shows an example of a conventional vibration damping device for an internal pump. The vibration damping device is a nozzle 10 mounted in a through hole 106 provided in a lower mirror 105 of a nuclear pressure vessel.
7, a lower end of a motor case 108 for an internal pump is connected to a base member 110 via a shock absorber 109 such as a snubber.

[0005]

However, when a sufficient space for installing the dynamic vibration absorber can be secured, as in a large structure such as a building structure, there is no problem in installing a plurality of dynamic vibration absorbers.

On the other hand, when the installation space of the dynamic vibration absorber is limited as in the case of a mechanical structure, and vibration control in multiple directions is required, the vibration control effect can be obtained with the conventional structure in which the vibration direction of the additional weight is specified. It is difficult to make an appropriate arrangement setting for obtaining the information.

Further, in the vibration isolator shown in FIG. 4, a relative position between the motor case 108 attached to the lower mirror 105 of the nuclear pressure vessel and the base member 110 due to heat and internal pressure as the pressure vessel becomes higher in temperature. Since displacement occurs, it is necessary to provide a structure for releasing the displacement.

[0008] Further, the shock absorber 109 is provided with the motor case 1 against vibration displacement caused by the operation of the internal pump.
Since the function of restraining the 08 is required, there is a problem that the structure becomes extremely complicated and large.

In order to deal with the arbitrary vibration direction, it is necessary to support the motor case 108 in at least two directions in a horizontal section. If two-way support is provided for each of the internal pumps, the occupied space becomes enormous, which not only results in an increase in the space of the pressure vessel section, but also results in a heat exchange disposed near the support. There is a problem that affects the accessibility to the container.

The present invention has been made in view of the above-described circumstances, and when a structure to be damped vibrates in a horizontal two-dimensional direction and has no anisotropy, one movable weight can be freely moved in a horizontal two-dimensional direction. It is an object of the present invention to provide a dynamic vibration absorber type vibration damping device supported so as to be able to follow a vibration in a direction.

[0011]

According to a first aspect of the present invention, there is provided a dynamic vibration absorber type vibration damping device, wherein a movable weight portion serving as a vibration absorber and an adjacent cylinder installed on the movable weight portion are provided. A movable section magnet row in which magnets are alternately arranged concentrically with different magnetic poles, a fixed section provided opposite to the movable section magnet row, and the movable weight section in a stationary state on the fixed section side. And a fixed portion magnet row in which different magnetic poles are arranged at positions facing the cylindrical magnet on the side, and the movable weight portion is horizontally supported by a magnetic force acting between the movable weight portion and the fixed portion. Things.

[0012]

According to the first aspect of the present invention having the above structure, when the movable weight portion moves from a stationary state, that is, when the centers of the opposed movable portion magnet rows and the fixed portion magnet rows are deviated from each other, the stationary Between different magnets facing each other at a position, a magnetic attraction force acts in the shearing direction of the magnetic flux to return to the original state. At the same time, the position of the cylindrical magnet is shifted,
Approaching a magnet with adjacent identical magnetic poles,
There, magnetic repulsion acts. Each of these acts as a restoring force for restoring the center offset in the radial direction, and thus can be used as a spring element. In addition, since the cylindrical magnets are arranged concentrically, the same restoring force can be obtained even in a horizontal two-dimensional displacement in any direction.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing one embodiment of a dynamic vibration absorber type vibration damping device according to the present invention, and FIG. 2 is a transverse sectional view of FIG.

In FIG. 1, a movable weight portion 1 serving as a vibration absorber is provided.
Is provided with a movable section magnet row 2 in which adjacent cylindrical magnets have different magnetic poles alternately and are arranged concentrically and in a multi-cylindrical manner,
An upper plate 4 and a bottom plate 5 of a cylindrical container 3 constituting a fixed portion are provided on the stationary side facing the movable unit magnet row 2.

In the space formed by the upper plate 4 and the bottom plate 5 of the cylindrical container 3, each element of the dynamic vibration absorber is accommodated, and each of the upper plate 4 and the bottom plate 5 is the same as the movable part magnet row 2. A fixed part magnet row 6 having a shape is provided with a constant gap 7 above and below the movable section magnet row 2. The fixed part magnet row 6 is configured such that different magnetic poles are respectively arranged at positions facing the respective cylindrical magnets of the movable part magnetic pole row 2 in the stationary state of the movable weight part 1.

Four bearings (spherical bearings) 8 are fixed to the upper and lower surfaces of the movable weight portion 1 at 90 degrees in the horizontal plane, respectively, while the upper plate 4 and the bottom plate facing these bearings 8 are fixed. Each of the seats 5 has a seat 9 fixed thereto.
When the bearing 8 comes into contact with these seats 9,
The vertical position of the movable weight portion 1 is restrained, and the distance of the gap 7 is kept constant. Therefore, in this embodiment, the horizontal rigidity of the movable weight portion 1 is adjusted by adjusting the distance of the gap 7 together with the magnetomotive force generated by the magnets of the movable portion magnet row 2 and the fixed section magnet row 6. be able to.

In this embodiment, in order to optimally adjust the damping force acting on the movable weight portion 1, four conductor plates 10 are provided on the peripheral surface of the movable weight portion 1 at every 90 degrees in a horizontal plane. A magnetic damper is configured such that two magnetic poles 12 are arranged at the tip of a yoke 11 fixed to the cylindrical container 3, and the conductor plate 10 is sandwiched in a gap 13 between these magnetic poles 12.

Therefore, in the present embodiment, it is possible to adjust the magnetomotive force by the magnetic pole 12, the distance adjustment of the gap 13, and the damping force acting on the movable weight portion 1 based on the number of magnetic dampers to be installed.

Here, in order to exhibit the performance of the dynamic vibration absorber, if the distance between the multiple cylinders is adjusted according to the amount of displacement required for the movable weight part 1, the movable weight part 1 is always stationary. A restoring force for returning to the position is obtained. For example, the movable part magnetic pole row 2
The distance between the cylindrical magnets is adjusted so that the central N pole of the above does not apply an attractive force between the adjacent north pole in the opposed fixed part magnet row 6 and the adjacent south pole. I just need.

Next, the operation of this embodiment will be described.

When the movable weight unit 1 moves from a stationary state,
That is, the opposing movable part magnetic pole row 2 and fixed part magnet row 6
When the magnets are deviated from the center, a magnetic attraction force acts in the shear direction of the magnetic flux between the different magnets facing each other at the rest position in an attempt to return to the original state. At the same time, the misalignment of the magnets results in approaching the adjacent magnet having the same magnetic pole, where a magnetic repulsion acts. Each of these acts as a restoring force for restoring the center offset in the radial direction, and thus can be used as a spring element.
In addition, since the magnets are arranged concentrically, the same restoring force can be obtained even for displacement in any two-dimensional horizontal direction.

As a modified example of this embodiment, if a permanent magnet and an electromagnet are used in the fixed part magnet row 6, the magnetomotive force generated from the fixed part magnet row 6 can be made variable, so that the movable weight can be changed. The support rigidity in the horizontal direction of the part 1 can be easily adjusted.

As described above, according to the present embodiment, the movable weight portion 1 is horizontally supported in a completely non-contact state except for a portion whose vertical position is restricted by the bearing 8 and the receiving seat 9. Also, there is no need to worry about contact friction due to vibration, fatigue of the support member, and the like, and a highly reliable vibration damping device can be obtained.

[0025]

As described above, according to the first aspect of the present invention,
According to this, a movable weight portion serving as a vibration absorber, a movable portion magnet row in which adjacent cylindrical magnets installed in the movable weight section are alternately arranged concentrically with different magnetic poles, and a movable section magnet row And a fixed part magnet row in which different magnetic poles are respectively arranged at positions opposed to the cylindrical magnet on the movable weight part side in a stationary state on the fixed part side, and the movable weight is provided on the fixed part side. The movable weight portion is horizontally supported by the magnetic force acting between the movable portion and the fixed portion, and the magnetic attraction force is applied in the shear direction of the magnetic flux between the opposite magnetic poles as the movable portion magnet row moves horizontally. Acts, and at the same time, a magnetic repulsion acts between adjacent opposing magnetic poles, so that it can be used as a spring element. As a result, the movable weight portion constituting the dynamic vibration absorber is supported with the same rigidity in any two-dimensional horizontal direction, and a single movable weight portion can provide a vibration damping effect regardless of the direction.

Since the magnets are arranged concentrically, the same restoring force can be obtained even when the magnet is displaced in any two-dimensional horizontal direction.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a dynamic vibration absorber type vibration damping device according to the present invention.

FIG. 2 is a transverse sectional view showing the dynamic vibration absorber type vibration damping device of FIG.

FIG. 3 is a schematic diagram showing an installation state of a conventional dynamic vibration absorber type vibration damping device.

FIG. 4 is a schematic view showing an attached state of a conventional internal pump vibration isolator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Movable weight part 2 Movable part magnet row 3 Cylindrical container 4 Top plate 5 Bottom plate 6 Fixed part magnet row 7 Gap 8 Bearing 9 Receiving seat 10 Conductor plate 11 Yoke 12 Magnetic pole

Continuation of front page (72) Inventor Yasushi Hattori 1 Toshiba, Komukai Toshiba-cho, Saisaki-ku, Kawasaki-shi, Kanagawa Prefecture Toshiba R & D Center Co., Ltd. (56) References -47379 (JP, A) Japanese Utility Model 2-38669 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16F 15/00-15/32 F04B 53/00 G21C 15/243 520

Claims (1)

(57) [Claims] 1. A movable weight portion serving as a vibration absorber, a movable portion magnet row in which adjacent cylindrical magnets installed in the movable weight portion are alternately arranged concentrically with different magnetic poles, and the movable portion magnet A fixed portion provided opposite to the row, and a fixed portion magnet row in which different magnetic poles are respectively arranged at positions opposed to the cylindrical magnet on the movable weight portion side in a stationary state on the fixed portion side; A dynamic vibration absorber type vibration damping device wherein the movable weight portion is horizontally supported by a magnetic force acting between a weight portion and the fixed portion.