JP2008157406A - Vibration damping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration damping device capable of suppressing rocking vibration of equipment horizontally and vertically supported in a vibration-damping manner at the same time by setting natural frequency of a vibration damping system in a high frequency range (20 Hz or higher) with which an existing vibration damping device such as vibration damping rubber and high damping metal material cannot cope. <P>SOLUTION: When a side part and lower part of a common base on which a plurality of instruments is mounted are supported in a fixed base, a vibration damping device comprising an elastic body and a vibration damping element is mounted at least on the side part of the common base. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vibration isolator for devices such as pumps, and more particularly to a vibration isolator for a plurality of devices mounted on a common base.

  When installing devices that generate vibration, such as pumps, blowers, compressors, and diesel engines, it is necessary to design the devices so that the vibrations generated from these devices are not propagated to others. In particular, when a plurality of devices are connected via a drive shaft, such as a pump and an electric motor, and a diesel engine and a generator, it is necessary to take a vibration-proof measure after mounting the plurality of devices on a common frame. Further, in this case, since the radial vibration of the drive shaft, that is, the rocking vibration is induced, it is necessary to support the common frame in the horizontal and vertical directions at the same time, and the vibration isolation structure becomes complicated.

  Conventionally, anti-vibration rubbers, metal springs, air springs, and combinations thereof have been used as anti-vibration devices. Although the spring characteristics can be secured in a relatively wide frequency range, the damping characteristics are high. There is a problem that it is difficult to ensure in the frequency region (20 Hz or more).

  In particular, when supporting a diesel engine installed in a nuclear power plant for vibration isolation, it is necessary to set the natural frequency of the vibration isolation support system to 20 Hz or more in order to be compatible with the strict seismic design standards of the nuclear power plant. is there. In the case where the frequency of occurrence is as high as 30 Hz or more, if the necessary spring characteristics and damping characteristics can be secured, the anti-vibration effect can be expected, but it is difficult to secure the damping characteristics in the frequency range of 20 Hz or more. It was. As described above, securing damping characteristics is an important issue not only for maintaining the anti-vibration performance but also for suppressing the rocking vibration generated in the device supported in the horizontal and vertical directions.

  A conventional vibration isolator will be described. For example, in the vibration isolator for a diesel engine described in Patent Document 1, an elastic body such as an anti-vibration rubber, a metal spring, or an air spring is used as an anti-vibration support device. It is necessary to arrange a large number of these elastic bodies so that the spring characteristics and damping characteristics at the same time as the desired characteristics, and the vibration isolation structure becomes complicated, and the equipment mounted on the common frame with high generated frequency It was difficult to suppress the rocking vibration.

  In addition, as another method, for example, as shown in Patent Document 2, a structure in which a device such as a diesel engine is suspended in a water tank has been proposed. However, the structure becomes large and the damping characteristic is ensured. This is difficult and requires a separate device to prevent rocking vibration.

In addition, Patent Documents 3 and 4 disclose a method in which a dynamic vibration absorber is attached to the device itself to suppress the vibration of the device, but even in this case, the device is mounted on a common frame having a high generated frequency. It was difficult to suppress the rocking vibration of the equipment.
JP-A-2-283395 Japanese Patent Laid-Open No. 9-280312 JP-A-5-187314 JP-A-9-287633

  The present invention has been made in order to solve the above-mentioned problems, and the anti-vibration support system is used in a high frequency range (20 Hz or more) which cannot be supported by existing vibration-proof devices such as vibration-proof rubber and high-damping metal materials. An object of the present invention is to provide a vibration isolator capable of suppressing rocking vibration of a device that is supported for vibration isolation horizontally and vertically by setting the natural frequency.

  In order to solve the above-described problems, the present invention provides a common frame on which a plurality of devices are mounted, a fixed foundation on which the common frame is mounted and supporting a lower part and a side part of the common frame, and the common frame. An anti-vibration device provided between the fixed base and including an elastic body and a damping element.

  The present invention also provides a common frame on which a plurality of devices are mounted, a fixed foundation on which the common frame is placed and supporting a lower part and a side part of the common frame, and a side part of the common frame and the fixed foundation A vibration isolator including an elastic body and a damping element, and a dynamic vibration absorber including at least one elastic body and a damping element provided on a side surface or an upper portion of the apparatus.

  According to the present invention, with the above configuration, it is possible to suppress the rocking vibration of a plurality of devices mounted on the common mount even when the generated frequency is high.

  Hereinafter, embodiments of the vibration isolator according to the present invention will be described with reference to the drawings.

(First embodiment)
First, a first embodiment of a vibration isolator according to the present invention will be described with reference to FIGS.
In the first embodiment, for example, a diesel engine 1 and a generator 2 are connected by a drive shaft 3, and each is fixedly installed on a common mount 4. In order to cut off the vibration generated by the diesel engine, first, a flexible spring element 5 such as a laminated rubber is disposed in order to hold its own weight in the vertical direction between the common base 4 and the fixed base 7. In addition, a vibration isolation device 6 comprising a spring element for determining the natural frequency of the vibration isolation support system and an elastic body and a damping element installed mainly for the purpose of preventing rocking vibration is provided on the side of the common gantry 4. It is installed between the fixed foundation 7 and.

  According to the first embodiment, the vibration isolation device is installed on the side of the common mount 4 where the diesel engine 1 and the generator 2 are installed, and the spring element 5 is installed on the bottom, thereby preventing rocking vibration. Can greatly improve the seismic performance. Instead of the spring element 5, a vibration isolating device 6 comprising an elastic body and a damping element is disposed between the common gantry 4 and the fixed base 7 so as to hold its own weight in the vertical direction and to block vertical vibrations. May be.

(Second Embodiment)
A second embodiment of the vibration isolator according to the present invention will be described with reference to FIGS.
In the second embodiment, the diesel engine 1 and the generator 2 are each fixedly installed on the common base 4 with a foundation bolt 9 via a foundation fixing flange 8. The common base 4 is provided with a through-hole 10 to store the lower part of the diesel engine 1 and the generator 2 as vibration-isolated devices, so that the center of gravity is located near the base fixing flange 8. The flange 8 is installed. Further, the foundation fixing flange 8 may be positioned near the drive shaft 3.

  According to the second embodiment, the base fixing flange 8 is arranged near the center of gravity of the entire equipment such as the diesel engine 1 and the generator 2 or near the drive shaft, and is fixed to the common base 4 that supports vibration isolation. As a result, the rotational inertia that excites the rocking vibration can be suppressed to a small value, so that the rocking vibration can be easily suppressed.

(Third embodiment)
Next, a third embodiment of the vibration isolator according to the present invention will be described with reference to FIGS.
In the third embodiment, the lower ends of the diesel engine 1 and the generator 2 that are the vibration-damped devices are fixed to the common mount 4 via the foundation fixing flange 8. The lower part of the common gantry 4 is supported by an anti-vibration device 5 or an anti-vibration device 6 and its side is supported by the anti-vibration device 6. However, in this case, a large rocking vibration occurs due to the high center of gravity. To do. In order to prevent this, for example, a vertical dynamic vibration absorber 11 is disposed on the side surface of the diesel engine 1 or a horizontal dynamic vibration absorber 12 is disposed on the top. Further, a plurality of the vertical dynamic vibration absorbers 11 and the horizontal dynamic vibration absorbers 12 may be disposed at the same time.

  According to the third embodiment, the natural frequency of horizontal / vertical translation and rotation around the rotation axis, which are natural vibration modes of the vibration isolating support system to be considered in a plane orthogonal to the rotation axis, are set. Correspondingly, a plurality of vibration absorbers are respectively adjusted and arranged. As a result, the vibration generated by the diesel engine 1 can be cut off, and the response amplification at the time of earthquake at all natural frequencies of the vibration isolation system can be reduced. Greatly improved.

(Fourth embodiment)
A specific configuration of the image stabilization device 6 according to the fourth embodiment of the present invention will be described with reference to FIGS.

  A conductor plate 13 is fixed to the common gantry 4, and a fixed magnet array 14 in which a plurality of permanent magnets are arranged so that adjacent magnets have different magnetic poles is fixed to a fixed back yoke 15 and then fixed to the conductor plate 10. It installs in the fixed foundation 7 so that it may oppose through the clearance gap 16. FIG. The conductor plate 13 and the fixed base 7 are coupled by an elastic body 17 such as a vibration-proof rubber, an air spring, or a metal spring. Although not shown, the common base 4 and the fixed base 7 may be directly coupled by the elastic body 17.

  According to the fourth embodiment, the natural frequency of the anti-vibration support system can be determined by the elastic body 17, and the vibration transmissibility can be suppressed to 1 or less in the frequency region of √2 times or more. Furthermore, although the flow of the magnetic flux between a plurality of magnets is indicated by broken-line arrows in FIGS. 4A and 4B, when the common mount 4 and the fixed base 7 move relative to each other, the magnetic flux and the conductor plate 13 move relative to each other. Thus, an eddy current is generated, so that a magnetic damping force proportional to the speed acts, and a damping effect for suppressing rocking vibration can be obtained.

(Fifth embodiment)
Next, a fifth embodiment of the vibration isolator according to the present invention will be described with reference to FIGS.
A fixed back yoke 15 is fixed to the common gantry 4 by fixing the conductor plate 13 via the support legs 18 and fixing a fixed side magnet row 14 in which a plurality of permanent magnets are arranged so that adjacent magnets have different magnetic poles. Install. When the movable side magnet row 19 having the same shape and arrangement as the fixed side magnet row 14 is opposed via the gap 16 with the conductor plate 13 interposed therebetween, the opposing magnets on the fixed side and the movable side are different magnetic poles. The movable magnet array 19 arranged in this manner is fixed to the movable back yoke 20, and the movable mass 21 is fixed to the movable back yoke 20, and then the movable mass 21 and the fixed base 7 are laminated rubber or plate. It couple | bonds by elastic members 22, such as a spring. Further, the common gantry 4 or the conductor plate 13 and the fixed base 7 are coupled by an elastic material 17 such as an anti-vibration rubber, an air spring or a metal spring. An arrangement example of the fixed side magnet row 14 and the movable side magnet row 19 is shown in FIG. 5B, and a plurality of adjacent magnets are arranged horizontally and vertically so that the adjacent magnets have different magnetic poles.

  According to the fifth embodiment, it is the elastic body 17 that determines the natural frequency of the anti-vibration support system, and when the common mount 4 and the fixed base 7 move relative to each other, A restoring force acts between the movable side magnet arrays 19, and a magnetic damping force acts by the relative movement of the magnetic flux crossing the conductor plate 13. These restoring force and damping force act between the movable mass 21 and the common gantry 4. When the restoring force (spring constant) and damping force (damping coefficient) are optimally adjusted with respect to the vibration of the common gantry, a dynamic vibration absorber is obtained. The vibration control effect can be obtained. The elastic member 22 made of laminated rubber or the like is a flexible member that does not affect the restoring force between the magnets while ensuring the gap 16 between the fixed side magnet row 14 and the movable side magnet row 19. As shown in FIG. 6, the same object can be achieved even if the elastic member 22 is installed between the movable mass 21 and the conductor plate 13.

(Sixth embodiment)
Next, a sixth embodiment of the vibration isolator according to the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the structure same as the said 5th Embodiment, and the overlapping description is abbreviate | omitted.

  In the sixth embodiment, a bearing mechanism 25 including a receiving seat 23 and a hard sphere 24 is provided between the movable mass 21 and the conductor plate 13.

  According to the sixth embodiment, the gap 16 between the fixed-side magnet row 14 and the movable-side magnet row 19 can be kept constant, and the restoring force and damping force are between the movable mass 21 and the common mount 4. Therefore, the vibration damping effect as a dynamic vibration absorber can be obtained by optimally adjusting the restoring force (spring constant) and damping force (damping coefficient) with respect to the vibration of the common gantry.

  Although not shown, the fixed side back yoke 15 to which the fixed magnet array 14 is fixed may be fixed to the conductor plate 13, and in that case, between the movable mass 21 and the common mount 4 via the support legs 18, Since the restoring force and damping force are transmitted, the vibration damping effect as a dynamic vibration absorber can be obtained.

(Seventh embodiment)
A seventh embodiment of the vibration isolator according to the present invention will be described with reference to FIG.
A foundation in which a conductive plate 13 is installed on a fixed base 7 or a common base 4 via support legs 18 and a plurality of base side magnet rows 26 are fixed on the fixed base 7 so that adjacent permanent magnets have different magnetic poles. A side back yoke 27 is installed. When the vibration-proof side magnet row 28 having the same shape and arrangement as the base-side magnet row 26 is opposed via the gap 30 with the conductor plate 13 in between, the opposed magnets on the base side and the vibration-proof side are different. An anti-vibration side magnet row 28 is arranged so as to be a magnetic pole, and is fixed to the anti-vibration side back yoke 29 and installed on the common mount 4.

  According to the seventh embodiment, the natural frequency of the vibration isolating support system is determined between the base side magnet row 26 and the vibration side magnet row 28 along with the vibration of the common mount 4. This is a magnetic restoring force, and an eddy current is generated by the relative movement of the magnetic flux and the conductor plate 13, whereby a magnetic damping force proportional to the speed acts and a damping effect for suppressing rocking vibration is obtained.

(Eighth embodiment)
A specific configuration example of the dynamic vibration absorbers 11 and 12 according to the eighth embodiment of the present invention will be described with reference to FIGS.
Here, although the vertical dynamic vibration absorber 11 will be described, the vertical dynamic vibration absorber 11 and the horizontal dynamic vibration absorber 12 are not substantially different in configuration.

  A fixed back yoke 15 is fixed to the side surface 31 of the diesel engine 1 by fixing the conductive plate 13 via the support legs 18 and fixing the fixed side magnet row 14 in which a plurality of permanent magnets are arranged so that adjacent magnets have different magnetic poles. Install on the common mount 4. In addition, when the movable side magnet row 19 having the same shape and arrangement as the fixed side magnet row 14 is made to oppose via the gap 16 with the conductor plate 13 in between, the opposing magnets on the fixed side and the movable side are different magnetic poles. The movable side magnet array 19 is arranged so as to be fixed to the movable side back yoke 20. Furthermore, after the movable mass 21 and the movable back yoke 20 are fixed, the movable mass 21 and the conductor plate 13 are coupled by an elastic member 22 such as a laminated rubber or a leaf spring.

  FIG. 9B shows an arrangement example of the fixed-side magnet row 14 and the movable-side magnet row 19, and a plurality of them are arranged horizontally and vertically so that adjacent magnets have different magnetic poles. For example, in the case of a rectangular magnet, the shape of the unit magnet can be arbitrarily set such that there is no limitation on the aspect ratio of the side length.

  According to the eighth embodiment, when the vibration of the diesel engine increases at the natural frequency of the vibration isolating support system, when the side surface of the diesel engine and the movable mass move relative to each other, the fixed-side magnet row 14 and the movable-side magnet A restoring force acts between the rows 19, and a magnetic damping force acts by relatively moving the magnetic flux crossing the conductor plate 13. These restoring force and damping force act between the movable mass 21 and the diesel engine 1, and optimally adjust the restoring force (spring constant) and damping force (damping coefficient) for the natural vibration of the diesel engine vibration isolation system. Thus, a vibration damping effect as a dynamic vibration absorber can be obtained. The elastic member 22 secures the gap 16 between the fixed side magnet row 14 and the movable side magnet row 19 and supports the weight of the movable mass as a flexible member so as not to affect the restoring force between the magnets.

Even if the elastic member 22 is installed between the movable mass 21 and the side surface 31 of the diesel engine 1, the same object can be achieved.
Furthermore, when installing in the top of a diesel engine, FIG. 9A may be rotated 90 degrees and the side surface 31 may be replaced with the top.

(Ninth embodiment)
A ninth embodiment of the vibration isolator according to the present invention will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the structure same as the said 8th embodiment, and the overlapping description is abbreviate | omitted.

  In the ninth embodiment, a bearing mechanism 25 including a receiving seat 23 and a hard sphere 24 is provided between the movable mass 21 and the conductor plate 13.

  According to the ninth embodiment, the gap 16 between the fixed-side magnet row 14 and the movable-side magnet row 19 can be kept constant, and the restoring force and damping force are the movable mass 21 and the side surface of the diesel engine 1. If the restoring force (spring constant) and damping force (damping coefficient) are optimally adjusted with respect to the natural vibration of the diesel engine vibration damping system, the damping effect as a dynamic vibration absorber can be obtained.

  Although not shown, the fixed back yoke 15 to which the fixed magnet array 14 is fixed may be fixed to the conductor plate 13. In this case, the movable mass 21 and the side surface 31 of the diesel engine 1 are connected via the support legs 18. Since the load transmission of the restoring force and the damping force is made between them, the vibration damping effect as a dynamic vibration absorber can be obtained.

  In addition, when installing in the top part of a diesel engine, what is necessary is just to rotate FIG. 10 90 degree | times and to replace the side surface 31 with a top part.

  Furthermore, the present invention is not limited to the embodiments described above, and various modifications may be made without departing from the spirit of the present invention, such as using the embodiments of the present invention in appropriate combinations. Can be implemented.

(A) is a front view of the vibration isolator which concerns on the 1st Embodiment of this invention, (b) is a side view. (A) is a front view of the vibration isolator which concerns on the 2nd Embodiment of this invention, (b) is a side view. (A) is a front view of the vibration isolator which concerns on the 3rd Embodiment of this invention, (b) is a side view. (A) is a vibration isolator which concerns on the 4th Embodiment of this invention, (b) is a magnet row top view of a vibration isolator. The vibration isolator vibration isolator which concerns on the 5th Embodiment of this invention, (b) is a magnet row top view of a vibration isolator vibration isolator. The modification of the vibration isolator which concerns on the 5th Embodiment of this invention. The vibration isolator which concerns on the 6th Embodiment of this invention. The vibration isolator which concerns on the 7th Embodiment of this invention. (A) is a dynamic vibration absorber which concerns on the 8th Embodiment of this invention, (b) is a magnet row top view of a dynamic vibration absorber. The dynamic vibration damper which concerns on the 9th Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Diesel engine, 2 ... Generator, 3 ... Drive shaft, 4 ... Common mount, 5 ... Soft spring element, 6 ... Anti-vibration device, 7 ... Fixed foundation, 8 ... Foundation fixing flange, 9 ... Foundation bolt, 10 DESCRIPTION OF SYMBOLS ... Penetration part, 11 ... Vertical direction dynamic vibration absorber, 12 ... Horizontal direction dynamic vibration absorber, 13 ... Conductor plate, 14 ... Fixed side magnet row, 15 ... Fixed side back yoke, 16 ... Gap, 17 ... Elastic body, 18 ... Support leg, 19 ... movable side magnet row, 20 ... movable side back yoke, 21 ... movable mass, 22 ... elastic member, 23 ... receiving seat, 24 ... rigid ball, 25 ... bearing mechanism, 26 ... base side magnet row, 27 ... Base side back yoke, 28 ... Vibration isolation side magnet row, 29 ... Vibration isolation side back yoke, 30 ... Gap, 31 ... Diesel engine side

Claims (13)

  A common base on which a plurality of devices are mounted; a fixed base on which the common base is placed and supporting a lower part and a side part of the common base; an elastic body provided between the common base and the fixed base; And a vibration isolating device including a damping element.   A common gantry on which a plurality of devices are mounted; a fixed foundation on which the common gantry is placed and supporting a lower portion and a side portion of the common gantry; and a common gantry and a side of the fixed foundation. An anti-vibration device comprising: an anti-vibration device including an elastic body and a damping element; and a dynamic vibration absorber including at least one elastic body and an attenuation element provided on a side surface or an upper portion of the device.   The plurality of devices are fixedly installed on the common frame via a foundation fixing flange, and the foundation fixing flange is disposed near the center of gravity of the plurality of devices or near the drive shaft. The vibration isolator according to claim 1 or 2.   The vibration isolating device includes a conductor plate fixed to a common gantry, a plurality of fixed-side permanent magnet rows arranged so that adjacent magnets have different magnetic poles with a certain gap from the conductor plate, and one surface The fixed-side back yoke having the other surface fixed to the fixed-side permanent magnet row and the elastic body connecting the fixed base and the conductor plate. The vibration isolator according to any one of 1 to 3.   The vibration isolating device includes a conductor plate fixed to a common gantry by a supporting leg, and a plurality of fixed side magnet rows arranged so that permanent magnets adjacent to the conductor plate via a certain gap have different magnetic poles, A fixed side back yoke having one surface fixed to a common frame and the other surface fixed to the fixed side permanent magnet row is opposed to the fixed side magnet row with a conductor plate interposed therebetween, and a counter magnet is provided. The base side magnet row arranged to be different magnetic poles, and one side is fixed to the base side magnet row, and the other side is a base side back yoke to which the fixed base is fixed. The vibration isolator according to any one of claims 1 to 3.   The vibration isolating device includes a conductor plate fixed to a common gantry by a supporting leg, and a plurality of fixed side magnet rows arranged so that permanent magnets adjacent to the conductor plate via a certain gap have different magnetic poles, A fixed side back yoke having one surface fixed to a common frame and the other surface fixed to the fixed side permanent magnet row is opposed to the fixed side magnet row with a conductor plate interposed therebetween, and a counter magnet is provided. The movable side magnet array arranged to have different magnetic poles, the movable side back yoke having the movable side magnet array fixed to one surface and the movable mass fixed to the other surface, and the movable side back yoke being elastic The vibration isolator according to any one of claims 1 to 3, wherein the vibration isolator is coupled to a fixed base via a member, and the common base or the conductive plate and the fixed base are coupled by an elastic body.   The vibration isolating device includes a conductor plate fixed to a common gantry by a supporting leg, and a plurality of fixed side magnet rows arranged so that permanent magnets adjacent to the conductor plate via a certain gap have different magnetic poles, A fixed side back yoke having one surface fixed to a common frame and the other surface fixed to the fixed side permanent magnet row is opposed to the fixed side magnet row with a conductor plate interposed therebetween, and a counter magnet is provided. The movable side magnet array arranged to have different magnetic poles, the movable side back yoke having the movable side magnet array fixed to one surface and the movable mass fixed to the other surface, and the movable side back yoke being elastic The vibration isolator according to any one of claims 1 to 3, wherein the vibration isolator is coupled to the conductor plate through a member, and a common base or the conductor plate and a fixed base are coupled by the elastic body.   The vibration isolating device includes a conductor plate fixed to a common gantry by a supporting leg, and a plurality of fixed side magnet rows arranged so that permanent magnets adjacent to the conductor plate via a certain gap have different magnetic poles, A fixed side back yoke having one surface fixed to a common frame and the other surface fixed to the fixed side permanent magnet row is opposed to the fixed side magnet row with a conductor plate interposed therebetween, and a counter magnet is provided. A movable side magnet array arranged so as to have different magnetic poles, a movable side back yoke in which the movable side magnet array is fixed on one surface and a movable mass is fixed on the other surface, and the movable side back yoke is a bearing The vibration isolator according to any one of claims 1 to 3, wherein the vibration isolator is coupled to the conductor plate through a mechanism, and a common base or the conductor plate and a fixed base are coupled by the elastic body.   3. The dynamic vibration absorber according to claim 2, wherein the dynamic vibration absorber is a vibration absorber whose frequency is adjusted in accordance with the natural frequency of horizontal, vertical, and rotation in a plane perpendicular to the rotation axis of the device. The vibration isolator of any one of thru | or 8.   The dynamic vibration absorber includes a conductor plate fixed to the device by a support leg, and a plurality of fixed-side magnet rows arranged so that permanent magnets adjacent to the conductor plate through a certain gap have different magnetic poles, A fixed back yoke having one surface fixed to the device and the other surface fixed to the fixed side magnet row is opposed to the fixed side magnet row with a conductor plate in between and a counter magnet is different. A movable side magnet array arranged to be a magnetic pole, a movable side back yoke in which the movable side magnet array is fixed to one surface and a movable mass is fixed to the other surface, and the movable side back yoke is an elastic member The vibration isolator according to any one of claims 2 to 9, wherein the anti-vibration device is coupled to the conductor plate via a pin.   The dynamic vibration absorber includes a conductor plate fixed to the device by a support leg, and a plurality of fixed-side magnet rows arranged so that permanent magnets adjacent to the conductor plate through a certain gap have different magnetic poles, A fixed back yoke having one surface fixed to the device and the other surface fixed to the fixed side magnet row is opposed to the fixed side magnet row with a conductor plate in between and a counter magnet is different. A movable side magnet array arranged to be a magnetic pole, a movable side back yoke in which the movable side magnet array is fixed to one surface and a movable mass is fixed to the other surface, and the movable side back yoke is a bearing mechanism The new protection device according to any one of claims 2 to 9, wherein the new protection device is coupled to the conductor plate via a wire.   The vibration isolator according to any one of claims 1 to 11, wherein the elastic body is made of a spring member such as an air spring or a metal spring, or a vibration isolating rubber.   The vibration isolator according to any one of claims 6, 7, 10 and 12, wherein the elastic member is made of elastic rubber or a leaf spring.

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