JPH09133258A - Damping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damping device which can be arranged in a desired position without depending on a fixing side condition such as a building, and can damp vibration generated to a damped body, and also can be applicable to a high temperature piping by using an elastic member formed by filling metal cotton into the inside of a metallic coil spring under a compressive condition. SOLUTION: Yoke fixing plates 9, yokes 10 and magnets 11 which are mutually connected through an elastic member 8 formed by filling metal cotton into the inside of a metallic coil spring under a compressive condition, are displaced having extremely little time lag when a plate member 6 integrated with a damped body 3 is displaced in a direction perpendicular to the direction of a magnetic flux due to the magnets 11. As a result, the plate member 6 is moved in the direction perpendicular to the direction of the magnetic flux against the magnets 11 at a certain speed so that damping force in a direction opposite to the moving direction of the plate member 6 is acted on the plate member 6, thus the vibration of the damped body 3 is damped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device.

[0002]

2. Description of the Related Art Generally, a large number of pipes and various devices are installed in a nuclear power plant or a chemical plant.
These pipes are supported on the fixed side of the building, etc., via springs and vibration dampers such as mechanical dampers and oil dampers, and the vibration dampers absorb the displacement due to thermal expansion of the pipes, and in the event of an earthquake, etc. It suppresses the vibration that occurs in the.

[0003]

However, the vibration isolator as described above is effective in suppressing a relatively large vibration such as an earthquake, but it is difficult to damp a minute vibration due to the fluid flowing inside the pipe. Met. In addition, there is a drawback that installation is restricted depending on the fixed conditions such as a building.

In view of the above situation, the present invention can be installed at a desired position without being affected by the conditions on the fixed side of a building or the like, and can damp vibrations generated in a vibration-damped body such as piping and equipment. The present invention is intended to provide a vibration damping device.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a plate member made of a non-magnetic conductor is attached to a vibration-damped member, and both sides of the plate member are covered with a metallic cotton in a compressed state with metallic cotton inside. A pair of yoke fixing plates mounted via filled elastic members, a yoke mounted so as to extend between the pair of yoke fixing plates, and fixed to the yoke and sandwiching both sides of the plate member. According to another aspect of the present invention, there is provided a vibration damping device including a magnet arranged to face each other at a minute interval.

Further, according to the present invention, a pair of yoke fixing plates mounted on the vibration-damped body, a yoke mounted so as to be bridged between the pair of yoke fixing plates, and a fixed interval fixed to the yokes. Between the magnets that are arranged to face each other and the pair of yoke fixing plates that are mounted via an elastic member formed by filling a metallic coil spring with metallic cotton in a compressed state, and between the magnets that are arranged to face each other. And a plate member made of a non-magnetic conductor arranged so as to be sandwiched at a minute interval.

According to the above means, the following effects can be obtained.

That is, in a vibration damping device in which a plate member made of a non-magnetic conductor is attached to a vibration-damped body, vibration is generated in the vibration-damped body due to an earthquake or the like, or fluid is flowing inside the vibration-damped body. When a small vibration is generated in the vibration-damped body and the plate material integrated with the vibration-damped body is displaced in the direction perpendicular to the direction of the magnetic flux by the magnet, a metal cotton is compressed inside the metal coil spring. In this state, the yoke fixing plate, which is connected via the elastic member filled in the state, and the yoke and the magnet are displaced with a slight time delay, and as a result, the plate member is perpendicular to the direction of the magnetic flux with respect to the magnet. The damping force in the direction opposite to the moving direction acts on the plate material, the vibration of the vibration-damped body is damped, and the vibration-damping device is directly attached to the vibration-damped body. Therefore, on the fixed side such as a building Matter is completely eliminated relationship, moreover, because it is a simple structure in which the plate and the magnet, and maintenance-free.

Further, in a vibration damping device in which a pair of yoke fixing plates are attached to the vibration-damped body, vibration is generated in the vibration-damped body due to an earthquake or the like, or vibration is damped by a fluid flowing inside the vibration-damped body. When a minute vibration is generated in the vibrating body and the yoke fixing plate and the yoke, which are integrated with the vibration-damped body, and the magnet are displaced in the direction along the surface of the plate member, the yoke fixing plate causes the metal inside the coil spring made of metal. The plate material connected via the elastic member filled with cotton in a compressed state will be displaced with a slight time delay,
As a result, the magnet moves at a certain speed with respect to the plate material, a damping force in the direction opposite to the moving direction acts on the magnet, the vibration of the vibration-damped body is damped, and the vibration damping device is Since it is attached directly to the vibration control body, the conditions on the fixed side such as the building are completely irrelevant, and since it has a simple structure in which magnets and plate materials are arranged, it is maintenance-free.

Here, in order to exert the damping function without any hindrance, the plate material is allowed to move in the direction in which the vibration-damped body vibrates, but it is necessary to prevent the plate material from contacting the magnet. Therefore, the elastic member is required to have the function and property of being strong against the compressive force in the inserting direction but being weak against the shearing force in the direction perpendicular to the inserting direction.

It can be said that it is almost ideal to use laminated rubber in which rubber and iron plates are alternately laminated as such an elastic member. Laminated rubber cannot be used because it is weak.

Therefore, it has been attempted to manufacture an elastic member from only a metal that is not affected by high temperature, but it has been considered difficult to obtain the same performance as a laminated rubber with only a metal.

However, according to the present invention, the elastic member is formed by filling the inside of the metallic coil spring with the metallic cotton such as stainless mesh in a compressed state.

Thus, the compressed metallic cotton functions to prevent further compression of the elastic member in the inserting direction, so that the plate material can be prevented from contacting the magnet and the metallic cotton can be interposed. Since it can be easily displaced in the direction perpendicular to the mounting direction, the plate material can be allowed to move in the radial direction of the pipe, and since the metal coil spring maintains the shape of the metal cotton, it is almost laminated rubber. The function equivalent to is obtained.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show a first embodiment of the present invention.

A pipe clamp 4 in the shape of a half cylinder is externally fitted to the pipe 3 (damped body) supported on the fixed side of the building or the like via a spring and a vibration damper (not shown) such as a mechanical damper or an oil damper. Then, the pipe clamp 4 is attached to the pipe 3 by tightening a fastener 2 such as a bolt and a nut to the flange portion 1, and an arcuate flange 5 extending in the circumferential direction of the pipe 3 is attached to the outer periphery of the pipe clamp 4. A half-divided ring-shaped plate member 6 made of a non-magnetic conductor such as a copper plate is attached to the arc-shaped flange 5 with fasteners 7 such as bolts and nuts to form half-divided ring members on both sides of the plate member 6. A pair of yoke fixing plates 9 are arranged, and a plurality of elastic members 8 are interposed between the yoke fixing plate 9 and the plate member 6 at a required interval in the circumferential direction. During, so as to be positioned between the elastic member 8, a plurality of yokes 10 at a predetermined interval in the circumferential direction
A pair of permanent magnets or magnets 11 such as electromagnets are fixed to each of the yokes 10 so as to face both surfaces of the plate member 6 with a minute gap, and a vibration damping device 12 is configured.

As the elastic member 8, a coil spring 18 made of metal as shown in FIG. 3 is used in which metallic cotton 19 such as stainless mesh is filled in a compressed state.

Next, the operation of the above embodiment will be described.

When a vibration is generated in the pipe 3 due to an earthquake or the like or a minute vibration is generated in the pipe 3 due to a fluid flowing inside the pipe 3, the pipe clamp 4 and the plate member 6 are displaced integrally with the pipe 3 in the radial direction of the pipe 3. At the same time, the yoke fixing plate 9, the yoke 10 and the magnet 11 connected to the plate member 6 via the elastic member 8 are displaced in the radial direction of the pipe 3 with a slight time delay. It will move at a certain speed with respect to the magnet 11.

Here, as shown in FIG. 4, a plate member 6 made of a non-magnetic conductor such as a copper plate is moved at a speed v in a direction perpendicular to the direction of the magnetic flux in a magnetic field generated by a pair of magnets 11 arranged opposite to each other. When moved, it is known that a force F is applied in the direction opposite to the moving direction by the eddy current flowing inside the plate member 6, and the force F is

F = Cv (C = nB ² tAμ / ρ) where n: logarithm of magnet B: magnetic flux density [T] t: plate thickness [m] A: magnetic flux area (= b × d) [ m ² ] μ: Non-dimensionalized damping coefficient (1-e ^−0.15a ) ρ: Electric resistance of plate material [Ω · m] a: Area ratio (= (b _C × d _C ) / (b × d), 2 <A <
5) is represented.

That is, when the plate member 6 moves with respect to the magnet 11 in a direction perpendicular to the direction of the magnetic flux at a certain speed due to the vibration of the pipe 3, a damping force in the direction opposite to the moving direction acts on the plate member 6. Therefore, the force F becomes a damping force, and the vibration of the pipe 3 in the radial direction is damped.

Experimental results when the vibration damping device 12 is attached to the pipe 3 having a diameter of 50 A are as shown in FIGS.
In the conventional case without the vibration damping device 12, as shown in FIG. 5, the response displacement of the pipe 3 sharply increases at a certain frequency, whereas in the case of the present embodiment equipped with the vibration damping device 12, the pipe 3 The response displacement is suppressed to a very small value which is almost constant regardless of the vibration frequency, and the damping ratio for the vibration displacement is improved by about 2.5% as compared with the conventional one, as shown in FIG. Also, the response displacement to the vibration displacement is as shown in FIG.
It can be seen that the value is suppressed to a very small value compared to the past.

Further, since the vibration damping device 12 is directly attached to the pipe 3, the conditions on the fixed side such as a building are completely irrelevant.
Moreover, since it has a simple structure in which the plate member 6 and the magnet 11 are arranged, it is maintenance-free.

In this way, it becomes possible to install the maintenance-free vibration damping device 12 at a desired position of the pipe 3 without being affected by the conditions of the fixed side such as a building, and the pipe 3
It is possible to damp vibrations that occur in the.

Here, in order to exert the damping function without any trouble, the plate member 6 is allowed to move in the direction in which the pipe 3 vibrates, but the plate member 6 contacts the magnet 11 such as a permanent magnet or an electromagnet. Therefore, the elastic member 8 has a function and a property of being strong against the compressive force in the inserting direction but weak against the shearing force in the direction perpendicular to the inserting direction. Desired.

It can be said that it is almost ideal to use a laminated rubber in which rubber and an iron plate are alternately laminated as the elastic member 8. However, when the pipe 3 has a high temperature, it is weak against heat. Therefore, laminated rubber cannot be used.

Therefore, it has been attempted to manufacture the elastic member 8 using only a metal which is not affected by high temperature, but it has been considered difficult to obtain the same performance as the laminated rubber with only the metal.

However, in the present invention, as the elastic member 8, a metal coil spring 18 as shown in FIG. 3 is used.
It is configured such that a metal cotton 19 such as a stainless steel mesh is filled in a compressed state in the inside of the.

As a result, the compressed cotton wool 19 functions to prevent further compression of the elastic member 8 in the inserting direction, so that the plate member 6 is prevented from coming into contact with the magnet 11 such as a permanent magnet or an electromagnet. In addition, the metal cotton 19 can be easily displaced in the direction perpendicular to the insertion direction, so that the plate member 6 can be allowed to move in the radial direction of the pipe 3 and the metal coil Spring 18
Since the shape of the metallic cotton 19 is maintained, the same function as that of the laminated rubber can be obtained.

8 and 9 show a second embodiment of the present invention.

While the embodiment shown in FIGS. 1 to 3 is for damping the vibration of the pipe 3 in the radial direction, FIGS. 8 and 9 are for damping the vibration of the pipe 3 in the axial direction. It is for doing.

A pipe clamp 4 having a half-cylindrical shape is externally fitted to the pipe 3 (damped body), and a fastener 2 such as a bolt or a nut is fastened to the flange portion 1 of the pipe clamp 4 so that the pipe clamp 4 is attached to the pipe 3. And a linear flange 5a extending in the axial direction of the pipe 3 is attached to the outer surface of the pipe clamp 4 (in the figure, there are two positions above and below the pipe clamp 4).
And a rectangular flat plate material 6 made of a non-magnetic conductor such as a copper plate is attached to the linear flange 5a by fasteners 7 such as bolts and nuts. The yoke fixing plate 9 is disposed, a plurality of elastic members 8 such as metal springs are interposed between the yoke fixing plate 9 and the plate member 6 at a required interval in the axial direction of the pipe 3, and A plurality of yokes 10 are laid between the yoke fixing plates 9 at predetermined intervals in the axial direction of the pipe 3 so as to be located between the elastic members 8.
In addition, a pair of permanent magnets or magnets 11 such as electromagnets are fixed so as to face both sides of the plate member 6 with a minute gap.

As the elastic member 8, a coil spring 18 made of metal similar to that shown in FIG. 3 is used in which metallic cotton 19 such as stainless mesh is filled in a compressed state.

Further, in FIGS. 8 and 9, 13 is a connecting member for connecting the upper and lower yoke fixing plates 9.

In the embodiment shown in FIGS. 8 and 9, vibration is generated in the pipe 3 due to an earthquake or the like, or microvibration is generated in the pipe 3 due to the fluid flowing inside the pipe 3, and the pipe 3 is integrated with the pipe 3. When the pipe clamp 4 and the plate member 6 are displaced in the axial direction of the pipe, the yoke fixing plate 9, the yoke 10 and the magnet 11 connected to the plate member 6 via the elastic member 8 cause a slight time delay and the pipe 3 Therefore, the plate member 6 moves relative to the magnet 11 in a direction perpendicular to the direction of the magnetic flux at a certain speed, and a damping force in the direction opposite to the moving direction is applied to the plate member 6. It acts and the vibration in the axial direction of the pipe 3 is damped.

In the case of this example, it is possible to damp vibrations in the radial direction of the pipe 3 and in one of the upper and lower directions in FIG.

Further, since the vibration damping device 12 shown in FIGS. 8 and 9 is also directly mounted on the pipe 3, the conditions on the fixed side such as a building are completely irrelevant, and the plate member 6 and the magnet 11 are simply arranged. Due to the structure, it is maintenance-free.

Thus, in the case of the embodiment shown in FIGS. 8 and 9, as in the case of the embodiment shown in FIGS. 1 and 2,
The maintenance-free vibration damping device 12 can be installed at a desired position of the pipe 3 without being affected by the conditions of the fixed side such as a building, and the vibration generated in the pipe 3 can be damped.

Here, in order to exert the damping function without trouble, the plate member 6 is allowed to move in the direction in which the pipe 3 vibrates, but the plate member 6 is brought into contact with the magnet 11 such as a permanent magnet or an electromagnet. Therefore, the elastic member 8 has a function and a property of being strong against the compressive force in the inserting direction but weak against the shearing force in the direction perpendicular to the inserting direction. Desired.

It can be said that it is almost ideal to use laminated rubber in which rubber and iron plates are alternately laminated as the elastic member 8. However, in the case where the pipe 3 has a high temperature, it is weak against heat. Therefore, laminated rubber cannot be used.

Therefore, it has been attempted to manufacture the elastic member 8 only with a metal which is not affected by high temperature, but it has been considered difficult to obtain the same performance as the laminated rubber with only the metal.

However, in the present invention, as the elastic member 8, a coil spring 18 made of metal similar to that shown in FIG. 3 is used in which metallic cotton 19 such as stainless mesh is filled in a compressed state. .

As a result, the compressed cotton wool 19 functions to prevent further compression of the elastic member 8 in the inserting direction, so that the plate member 6 is prevented from coming into contact with the magnet 11 such as a permanent magnet or an electromagnet. In addition, the metal cotton 19 can be easily displaced in the direction perpendicular to the insertion direction, so that the plate member 6 can be allowed to move in the radial direction of the pipe 3 and the metal coil Spring 18
Since the shape of the metallic cotton 19 is maintained, the same function as that of the laminated rubber can be obtained.

Needless to say, the vibration damping device 12 shown in FIGS. 1 to 3 and the vibration damping device 12 shown in FIGS. 8 and 9 may be combined in the pipe 3 if necessary.

10 and 11 show a third embodiment of the present invention.

This is a modification of the embodiment shown in FIGS. 1 to 3 for damping radial vibrations of the pipe 3.

A pipe clamp 4 having a half-cylindrical shape is externally fitted to the pipe 3 (damped body), and a fastener 2 such as a bolt or a nut is fastened to the flange portion 1 of the pipe clamp 4 to fix the pipe clamp to the pipe 3. 4, a pair of arc-shaped flanges 5 extending in the circumferential direction of the pipe 3 are projectingly provided on the outer periphery of the pipe clamp 4, and the arc-shaped flanges 5 have a pair of half-ring-shaped yoke fixing plates. 9 are attached by fasteners 7 such as bolts and nuts, and a plurality of yokes 10 are spanned between the pair of yoke fixing plates 9 with a required spacing in the circumferential direction, and the yokes 10 are opposed to each other with a required spacing. In this way, a pair of permanent magnets or electromagnets 11 are fixed, and a half ring-shaped plate member 6 made of a non-magnetic conductor such as a copper plate is arranged with a minute gap between the magnets 11 facing each other. , Yo A vibration damping device 12 is configured by interposing a plurality of elastic members 8 such as metal springs between the fixed plate 9 and the plate member 6 at predetermined intervals in the circumferential direction so as to be located between the yokes 10. is there.

As the elastic member 8, a metallic coil spring 18 similar to that shown in FIG. 3 is used, in which metallic cotton 19 such as stainless mesh is filled in a compressed state.

Further, in FIG. 11, reference numeral 14 is a connecting member for connecting the plate members 6 in the shape of a half ring.

In the embodiment shown in FIGS. 10 and 11, vibration is generated in the pipe 3 due to an earthquake or the like, or microvibration is generated in the pipe 3 due to the fluid flowing inside the pipe 3 so that the pipe 3 is integrated with the pipe 3. The pipe clamp 4, the yoke fixing plate 9, the yoke 10, and the magnet 11 are connected to the pipe 3
Is displaced in the radial direction, the plate member 6 connected to the yoke fixing plate 9 via the elastic member 8 is displaced in the radial direction of the pipe 3 with a slight time delay.
As a result, the magnet 11 moves at a certain speed with respect to the plate member 6, and a damping force in the direction opposite to the moving direction acts on the magnet 11, and the damping force damps the vibration of the pipe 3 in the radial direction. It

Further, the vibration damping device 12 shown in FIGS.
Since it is also directly attached to the pipe 3, conditions on the fixed side such as a building are completely irrelevant, and since the magnet 11 and the plate member 6 are arranged in a simple structure, they are maintenance-free.

Thus, in the case of the embodiment shown in FIGS. 10 and 11, as in the case of the embodiment shown in FIGS. 1 to 3, the desired pipe 3 is not affected by the conditions on the fixed side such as the building. The maintenance-free vibration damping device 12 can be installed at the position, and the vibration generated in the pipe 3 can be damped.

Here, in order to exert the damping function without any trouble, the plate member 6 is allowed to move in the direction in which the pipe 3 vibrates, but the plate member 6 is brought into contact with the magnet 11 such as a permanent magnet or an electromagnet. Therefore, the elastic member 8 has a function and a property of being strong against the compressive force in the inserting direction but weak against the shearing force in the direction perpendicular to the inserting direction. Desired.

It can be said that it is almost ideal to use a laminated rubber in which rubber and an iron plate are alternately laminated as the elastic member 8. However, in the case where the pipe 3 has a high temperature, it is weak against heat. Therefore, laminated rubber cannot be used.

Therefore, it has been attempted to manufacture the elastic member 8 using only a metal that is not affected by high temperature, but it has been considered difficult to obtain the same performance as that of the laminated rubber using only the metal.

However, in the present invention, as the elastic member 8, a coil spring 18 made of metal similar to that shown in FIG. 3 is used in which metallic cotton 19 such as stainless mesh is filled in a compressed state. .

As a result, the compressed cotton wool 19 functions to prevent further compression of the elastic member 8 in the inserting direction, so that the plate member 6 is prevented from coming into contact with the magnet 11 such as a permanent magnet or an electromagnet. In addition, the metal cotton 19 can be easily displaced in the direction perpendicular to the insertion direction, so that the plate member 6 can be allowed to move in the radial direction of the pipe 3 and the metal coil Spring 18
Since the shape of the metallic cotton 19 is maintained, the same function as that of the laminated rubber can be obtained.

FIGS. 12 and 13 show a fourth embodiment of the present invention, in which the vibration of the pipe 3 in the axial direction is damped.
9 is a modification of the embodiment shown in FIG.

A pipe clamp 4 having a half-cylindrical shape is externally fitted to the pipe 3 (damped body), and a fastener 2 such as a bolt or a nut is fastened to the flange portion 1 of the pipe clamp 4 to fix the pipe clamp to the pipe 3. 4 is attached to the outer periphery of the pipe clamp 4, and a linear flange 5a extending in the axial direction of the pipe 3 is attached.
Of the pipe clamps (in the figure, two pairs of protrusions are provided above and below the pipe clamp 4), and a rectangular plate-shaped yoke fixing plate 9 is attached to each linear flange 5a by a fastener such as a bolt or a nut. 7, the yoke 1 is fixed to the pair of yoke fixing plates 9 with a required gap in the axial direction of the pipe 3.
A plurality of 0s are bridged, a pair of permanent magnets or magnets 11 such as electromagnets are fixed to each yoke 10 so as to face each other with a required gap, and a copper plate or the like is provided with a minute gap between the facing magnets 11. Rectangular flat plate material 6 made of non-magnetic conductor
And a plurality of elastic members 8 such as metal springs are interposed between the yoke fixing plate 9 and the plate member 6 in the axial direction of the pipe 3 so as to be located between the yokes 10. The vibration damping device 12 is configured.

As the elastic member 8, a coil spring 18 made of metal similar to that shown in FIG. 3 is used in which metallic cotton 19 such as stainless mesh is filled in a compressed state.

In the embodiment shown in FIGS. 12 and 13, vibration is generated in the pipe 3 due to an earthquake or the like, or a minute vibration is generated in the pipe 3 due to the fluid flowing inside the pipe 3, and the pipe 3 is integrated with the pipe 3. When the pipe clamp 4, the yoke fixing plate 9, the yoke 10 and the magnet 11 are displaced in the axial direction of the pipe, the plate member 6 connected to the yoke fixing plate 9 via the elastic member 8 causes a slight time delay and the pipe 3, the magnet 11 moves at a certain speed with respect to the plate member 6, and a damping force in the opposite direction to the moving direction acts on the magnet 11 to cause the axial line of the pipe 3 to move. Vibrations in the direction are damped.

In the case of this example, it is possible to damp vibrations in the radial direction of the pipe 3 in one of the upper and lower directions in FIG.

Further, the vibration damping device 12 shown in FIG. 12 and FIG.
Since it is also directly attached to the pipe 3, conditions on the fixed side such as a building are completely irrelevant, and since the magnet 11 and the plate member 6 are arranged in a simple structure, they are maintenance-free.

Thus, in the case of the embodiment shown in FIGS. 12 and 13, as in the case of the embodiment shown in FIGS. 8 and 9, the desired pipe 3 is not affected by the conditions on the fixed side such as the building. The maintenance-free vibration damping device 12 can be installed at the position, and the vibration generated in the pipe 3 can be damped.

Here, in order to exert the damping function without any trouble, the plate member 6 is allowed to move in the direction in which the pipe 3 vibrates, but the plate member 6 contacts the magnet 11 such as a permanent magnet or an electromagnet. Therefore, the elastic member 8 has a function and a property of being strong against the compressive force in the inserting direction but weak against the shearing force in the direction perpendicular to the inserting direction. Desired.

It can be said that it is almost ideal to use laminated rubber in which rubber and iron plates are alternately laminated as the elastic member 8. However, in the case where the temperature of the pipe 3 is high, it is weak against heat. Therefore, laminated rubber cannot be used.

Therefore, it has been attempted to manufacture the elastic member 8 using only a metal that is not affected by high temperature, but it has been considered difficult to obtain the same performance as that of the laminated rubber using only the metal.

However, in the present invention, the elastic member 8 is made of a metallic coil spring 18 similar to that shown in FIG. 3, in which a metallic cotton 19 such as stainless mesh is filled in a compressed state. .

As a result, the compressed cotton wool 19 functions to prevent further compression of the elastic member 8 in the inserting direction, so that the plate member 6 is prevented from contacting the magnet 11 such as a permanent magnet or an electromagnet. In addition, the metal cotton 19 can be easily displaced in the direction perpendicular to the insertion direction, so that the plate member 6 can be allowed to move in the radial direction of the pipe 3 and the metal coil Spring 18
Since the shape of the metallic cotton 19 is maintained, the same function as that of the laminated rubber can be obtained.

In the above embodiment, the pipe 3 is used.
An example in which the vibration damper 12 is attached to the pipe 3 and the pipe clamp 4 is shown in Fig. 14, but as shown in Fig. 14, for example, a valve 16 or a re-circulation system pipe 15 connected to the reactor pressure vessel It is also possible to mount the vibration damping device 12 on the equipment (damped body) such as the circulation pump 17 or the compressor and the pipe clamp 4 on the pipe 3 to damp the vibration generated in those equipments.

The vibration damping device of the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0073]

As described above, according to the vibration damping device of the present invention, it is possible to install the vibration damping device at a desired position without being influenced by the conditions of the fixed side such as a building, and to generate the vibration on the vibration-damped body. Can be dampened, and by using an elastic member made by filling the inside of a metallic coil spring with metallic cotton in a compressed state,
The excellent effect that it can be applied to high-temperature piping can be achieved.

[Brief description of the drawings]

FIG. 1 is a first embodiment of the present invention, and is a view when seen from a direction of arrows I-I in FIG. 2 when a vibration damping device is applied to a pipe as a device for damping vibration of the pipe in a radial direction. It is a sectional side view.

FIG. 2 is a front view of FIG.

FIG. 3 is a schematic side sectional view of an elastic member.

FIG. 4 is a conceptual diagram showing a principle in an example of an embodiment of the present invention.

FIG. 5 is a diagram showing experimental results of response displacement with respect to frequency in the present invention and a conventional example.

FIG. 6 is a diagram showing an experimental result of a damping ratio with respect to an oscillating displacement in the present invention and a conventional example.

FIG. 7 is a diagram showing experimental results of response displacement with respect to vibration displacement in the present invention and a conventional example.

FIG. 8 is a second embodiment of the present invention and is a front view in the case where the vibration damping device is applied to a pipe as a device for damping vibration in the axial direction of the pipe.

FIG. 9 is a side view of FIG.

FIG. 10 is a side cross-sectional view showing the third embodiment of the present invention as viewed in the direction of arrow XX in FIG.

FIG. 11 is a front view of FIG. 10;

FIG. 12 is a front view showing a fourth embodiment of the present invention.

FIG. 13 is a side view of FIG.

FIG. 14 is a perspective view showing an example in which the vibration damping device of the present invention is applied to a device such as a valve or a pump.

[Explanation of symbols]

 3 Piping (Vibrated Body) 6 Plate Material 8 Elastic Member 9 Yoke Fixing Plate 10 Yoke 11 Magnet 12 Damping Device 16 Valve (Vibrated Body) 17 Recirculation Pump (Vibrated Body) 18 Metal Coil Spring 19 Metal cotton

Claims (2)

[Claims] 1. A plate member made of a non-magnetic conductor attached to a vibration-damped member, and elastic members formed on both sides of the plate member by filling a metal coil spring with cotton wool in a compressed state. A pair of yoke fixing plates attached to each other, a yoke mounted so as to be bridged between the pair of yoke fixing plates, and fixed to the yoke and arranged to face each other at a minute interval so as to sandwich both sides of the plate material. A vibration damping device comprising a magnet. 2. A pair of yoke fixing plates attached to the vibration-damped body, a yoke attached so as to be hung between the pair of yoke fixing plates, and fixed to the yoke and arranged to face each other at a predetermined interval. Between the magnet and the pair of yoke fixing plates mounted via an elastic member formed by filling the inside of a metallic coil spring with metallic cotton in a compressed state, and a minute gap between the opposed magnets. And a plate member made of a non-magnetic conductor arranged so as to be sandwiched by the vibration damping device.