JP2022106409A - Viscoelastic damper - Google Patents

Abstract

To provide a viscoelastic damper reducing self-load and earthquake response of an object to be supported, of a piping system and the like of a large heat transfer amount, and not restricting the heat transfer of the object.SOLUTION: A viscoelastic damper includes: a housing portion containing a viscous fluid; a piston portion inserted to the housing portion; an elastic body housed inside of the housing portion and connected to the piston portion; a top plate portion having a plate-like top plate and disposed at a side opposite to the housing portion, of the piston portion; and a mechanism portion engaging the piston portion and the top plate portion in a manner of being brought into contact with and separated from each other and capable of changing a height from the bottom of the piston portion to the top plate of the top plate portion. A hole through which the viscous fluid passes in moving the piston portion, is formed on the piston portion, and the top plate of the top plate portion is brought into contact with an object to be supported, by moving the piston portion by elastic force of the elastic body.SELECTED DRAWING: Figure 1

Description

The present invention relates to a viscoelastic damper. The viscoelastic damper of the present invention is suitable for use in supporting an object (pipe, building, heavy object, etc.).

Vibration control devices that reduce the seismic response of piping systems are described in Patent Document 1 and Patent Document 2.

Patent Document 1 states, "In order to achieve the above object, the present invention has good fatigue characteristics between a movable system and a stationary system in a fixing member fixed to the stationary system and around the movable system such as a pipe diameter. The wire rope seismic support is arranged so that the wire rope seismic support is supported by either a stationary system or a movable system, and the other is slidably contacted via a friction plate. "(Page 2, upper right column, lines 9-16; means for solving problems).

Patent Document 2 states, "A cylinder, a piston penetrating one end of the cylinder, a disk having an orifice provided at the inner end of the piston, and a ball bearing provided between the cylinder, the disk, and the piston. A vibration damping member made of permanent magnets provided at both ends of a disk in the cylinder inner chamber, and an elastic member made of laminated rubber between the cylinder and the piston, and within the volume composed of the cylinder and the elastic member. Is a vibration damping device for piping, which is characterized by providing a small space in the cylinder and filling it with viscous fluid. ”(Page 1, left column, lines 5 to 14; scope of patent claims) and“ That is, piping. The attachment eye 12 of the piston 2 is attached to the support 15 attached to 14, and the attachment 13 is attached to the bracket 17 provided on the floor and wall 16 of the building. These attachments are allowed to rotate around the attachment bolt. (Lines 9 to 14 in the upper right column of page 2).

Further, a seismic isolation device that reduces the seismic response of a building is described in Patent Document 3.
Patent Document 3 states that "a piston 14b is formed at the tip of a rod body 14 attached to a building 12. A countersunk spring 20 is housed in a tubular case body 18 attached to a foundation 16 in a laminated state. The countersunk spring 20 is sandwiched between the bottom portion 18a of the tubular case body 18 and the piston 14b slidably inserted into the tubular case body 18. The vertical spring constant of the countersunk spring 20 is set to the static value of the building 12. It is set in advance so that it is located at the displacement point P of the vertical spring characteristic S of the countersunk spring 20 in a state where the target load W1 is applied. The inside of the tubular case body 18 is sealed and the viscous fluid is sealed in the piston 14b. It forms an orifice 22 that penetrates both the upper and lower surfaces. "(Page 1; Solution for Summary).

Japanese Unexamined Patent Publication No. 64-21289 Japanese Unexamined Patent Publication No. 61-11988 Japanese Unexamined Patent Publication No. 10-31369

In the fixing member described in Patent Document 1, a wire rope wound in a spiral shape is compressed, pulled, and rolled by receiving a load to provide flexible spring support, and is moderately supported by friction between strands. Causes damping. Further, with respect to the vibration in the axial direction of the pipe, the vibration is damped by the frictional force generated between the retainer of the wire rope and the friction plate.
However, in the fixing member described in Patent Document 1, the damping of the pipe response due to friction has a characteristic that the static friction force is larger than the dynamic friction force, so that there is a problem that the heat transfer of the piping system cannot be followed. rice field.

The piping control device described in Patent Document 2 utilizes the magnetic force of a permanent magnet and the viscous resistance of a viscous fluid.
However, since the permanent magnets described in Patent Document 2 are arranged on both sides of the piston, there is a problem that the permanent magnets cannot support the own weight load of the pipe.
Further, the piping control device described in Patent Document 2 is attached to the piping system by passing a mounting bolt through the mounting eye and connecting to a support tool that supports the piping, and heat transfer. There was a problem that it could not be applied to a large amount of piping system.

The vibration isolator described in Patent Document 3 utilizes the elastic force of a disc spring and the viscous resistance of a viscous fluid.
However, the vibration isolator described in Patent Document 3 has a problem that the supporting load cannot be changed unless the device is disassembled because the elastic force of the disc spring needs to be predetermined before installation. ..

An object of the present invention is to provide a viscoelastic damper that reduces the weight load and seismic response of a supporting object such as a piping system having a large amount of heat transfer, and does not restrain the heat transfer of the object.

In addition, the above object and other purposes of the present invention and novel features of the present invention will be clarified by the description of the present specification and the accompanying drawings.

The viscoelastic damper of the present invention includes a housing portion containing a viscoelastic fluid, a piston portion inserted into the housing portion, an elastic body housed inside the housing portion and connected to the piston portion, and a plate-shaped top plate. From the bottom of the piston part to the top plate of the top plate part by engaging the top plate part provided on the opposite side of the housing part of the piston part from the bottom of the piston part so that the piston part and the top plate part can be brought into contact with each other. It is provided with a mechanical unit capable of changing the height of the piston.
The viscoelastic damper of the present invention is an object to be supported by providing a hole in the piston portion for the viscous fluid to pass when the piston portion moves and moving the piston portion by the elastic force of the elastic body. The structure is such that the top plate of the top plate comes into contact with an object.

According to the viscoelastic damper of the present invention, the self-weight load of the object can be adjusted and the seismic response of the object can be reduced regardless of the amount of heat transfer of the object supported by the viscoelastic damper. An elastic damper can be provided.

Issues, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

It is a breaking side view which shows the whole picture of the viscoelastic damper of Example 1 of this invention. FIG. 5 is a fracture side view showing a state in which the height from the lower plate of the piston portion to the top plate of the top plate portion is adjusted to be large in the viscoelastic damper according to the first embodiment of the present invention. It is a breaking side view which shows the whole picture of the viscoelastic damper of Example 2 of this invention.

Hereinafter, embodiments and examples according to the present invention will be described with reference to text or drawings. However, the structures, materials, and various other specific configurations shown in the present invention are not limited to the embodiments and examples taken up here, and can be appropriately combined and improved without changing the gist. Is. In addition, elements not directly related to the present invention are not shown.

The viscoelastic damper of the present invention includes a housing portion containing a viscoelastic fluid, a piston portion inserted into the housing portion, an elastic body housed inside the housing portion and connected to the piston portion, and a plate-shaped top plate. It is provided with a top plate portion provided on the side opposite to the housing portion of the piston portion.
Further, the viscoelastic damper of the present invention has a mechanism portion capable of engaging the piston portion and the top plate portion in a contactable manner and changing the height from the bottom of the piston portion to the top plate of the top plate portion. , Equipped with.
The viscoelastic damper of the present invention is an object to be supported by providing a hole in the piston portion for the viscous fluid to pass when the piston portion moves and moving the piston portion by the elastic force of the elastic body. The structure is such that the top plate of the top plate comes into contact with an object.

The viscoelastic damper described above is intended to support an object. Examples of the object include pipes, buildings, heavy objects, and the like.

In the viscoelastic damper described above, for example, a spring can be used as the elastic body housed inside the housing portion and connected to the piston portion.
When a spring is used as the elastic body, the elastic body can have a relatively simple structure, and the volume occupied by the elastic body can be reduced.
The elastic body is not limited to the spring, and other elastic body such as rubber can be used.

In the viscoelastic damper described above, it is preferable that the elastic body has a configuration in which an elastic force is applied in a direction in which the piston portion is brought closer to the object.
With this configuration, the elastic force of the elastic body allows the top plate of the top plate portion to follow the movement of the object supported by the viscoelastic damper and come into contact with the object.

In the above-mentioned viscoelastic damper, the mechanism portion capable of engaging the piston portion and the top plate portion in a contactable manner and changing the height from the bottom of the piston portion to the top plate of the top plate portion is the piston portion. The height from the bottom of the top plate to the top plate of the top plate portion can be changed continuously or intermittently.

Examples of the configuration of the mechanism unit whose height can be continuously changed include screws, turnbuckles, and the like. Examples of the turnbuckle include a type in which the tension of the wire is adjusted by changing the length, a type in which the distance between a heavy object and the floor is adjusted, such as a steel bundle for construction, and the like. The latter type is adopted for.
When a screw is used for the above mechanism, for example, a screw is provided on the top plate and the piston, and the top plate is turned to increase the height from the bottom of the piston to the top of the top plate. To change.
When a turnbuckle is used for the mechanism, for example, the distance between the upper and lower plates is changed by turning the turnbuckle, as in the case of the turnbuckle used for steel bundles for construction.

Various configurations can be considered as the configuration of the mechanism unit whose height can be changed intermittently.
For example, of the top plate portion and the piston portion, a protrusion portion is provided on one side and a groove having a different depth is provided on the other side, and the protrusion portion is inserted into the groove to extend from the bottom of the piston portion to the top plate of the top plate portion. A configuration in which the height is determined is conceivable. Two or more protrusions are provided radially from the central axis, and a set of grooves having the same number and depth as the protrusions is provided, and a plurality of sets of grooves having different depths are provided. In this configuration, the height can be changed by lifting the top plate portion and changing the groove into which the protrusion portion is inserted.

Since the above-mentioned viscoelastic damper is intended to support an object, the height from the bottom of the piston portion to the top plate of the top plate portion during normal use, which supports the object, is high. It is desirable to be able to hold it so that it does not change much. Therefore, the above-mentioned mechanical unit can maintain the height against vibration or movement of the object regardless of whether the height can be continuously changed or the height can be changed intermittently. Is desirable.
Then, when maintenance or the above-mentioned height needs to be changed, the mechanical part is adjusted to change the height.

Further, when the above-mentioned screws are adopted for the mechanical portion, or when the above-mentioned protrusions and grooves are adopted, one of the top plate portion and the piston portion is a cylindrical member and the other is a cylindrical member. Therefore, it is preferable that the cylindrical member is accommodated by the cylindrical member. With this configuration, by turning the top plate portion, the tightening condition of the screw can be changed and the groove into which the protrusion portion is inserted can be changed, so that the height can be easily changed.
Then, for example, if the top plate portion is cylindrical and the piston portion is cylindrical, the top plate portion can be simplified and miniaturized.

In the viscoelastic damper described above, the piston portion is provided with a hole through which the viscous fluid passes when the piston portion moves.
The number and positions of holes provided in the piston portion are not limited, but in particular, two or more holes are provided so that the distance from the central axis of the piston portion is the same and the angles viewed from the central axis are evenly spaced. For example, the force received by the piston portion from the viscous fluid moving through the hole becomes equal.

Further, in the hole of the piston portion, the cross-sectional area of the hole becomes large when the piston portion moves toward the object, and the cross-sectional area of the hole becomes small when the piston portion moves away from the object. It is possible to provide a mechanism.
By providing such a mechanism, when the piston portion moves toward the object, the cross-sectional area of the hole is increased and the viscous resistance is reduced, so that the piston portion can be easily moved, and the top plate and the piston are provided. The part becomes easier to follow the movement of the object. Further, when the piston portion moves away from the object, the cross-sectional area of the hole is reduced and the viscous resistance is increased, so that the vibration of the object is attenuated.

As a mechanism for changing the cross-sectional area of the hole, for example, the following examples (1) to (3) can be considered. In the following examples (1) to (3), a case where the viscoelastic damper is arranged below the object to be supported and the piston portion moves in the direction toward the object due to the piston portion rising will be described. is doing.
The configuration of the mechanism for changing the cross-sectional area of the holes is not limited to the following examples, and other configurations may be adopted.

(1) The hole of the piston part is used as a hole penetrating the bottom of the piston part, and a space wider than the other parts of the hole is provided in the middle part of the hole, and the width is larger than the other parts of the hole in the space. Put an object. Since this object is wider than the rest of the hole, it acts as a plug that closes the hole. When the object closes the hole, the cross-sectional area of the hole becomes smaller. The object is pushed by the viscous fluid and moves when the piston portion moves up and down.
Further, for example, the cross section of the hole on the upper side (top plate side) of the space is made circular, and the cross section of the hole on the bottom side (elastic body) side of the space is made square, so that a spherical object is inserted into the space. Can be considered. With this configuration, when the piston portion descends, the viscous fluid pushes the object upward, so that the spherical object completely closes the circular hole. On the other hand, when the piston part rises, the viscous fluid pushes the object downward, so the spherical object closes the square hole, but a gap remains between the square hole and the spherical object. Therefore, the cross-sectional area of the hole is larger by the amount of the gap as compared with the case where the piston portion is lowered.
The cross section of the upper hole and the lower hole of the space are both rectangular, and the length or aspect ratio of the side of the rectangle is changed between the upper hole of the space and the bottom hole of the space, and the lower side. The cross-sectional area of the hole can be changed in the same manner even if the hole of the hole has a larger gap with the spherical object than the hole on the upper side.

(2) Similar to (1), the hole of the piston part is used as a hole penetrating the bottom of the piston part, and a space wider than the other parts of the hole is provided in the middle part of the hole, and the hole is formed in the space. Insert an object (plug) that is wider than the other parts.
Further, for example, the cross section of the hole other than the space is made circular, a spherical object is put into the space, and the material of the spherical object is a substance having a specific gravity similar to that of the viscous fluid or a substance having a specific gravity lighter than that of the viscous fluid. do. With this configuration, when the piston part descends, the hole on the upper side of the space is closed with an object as in (1), but when the piston part rises, it is against the force that the viscous fluid pushes downward. Since buoyancy and the like serve as drag, the hole on the bottom side of the space is less likely to be blocked by an object. As described above, since the hole on the bottom side of the space is not easily closed, the change in the cross-sectional area of the hole can be made larger than that of the configuration of (1).

In each of the above configurations (1) and (2), the space for inserting the object is set to a size that allows the object to move to the hole on the upper side or the hole on the bottom side of the space. However, if the width of the space is too wide, the force of the moving viscous fluid does not efficiently act on the object, so that it becomes difficult for the object to follow the ascent or descent of the piston portion. Therefore, it is preferable that the width of the space is set to be slightly wider than the width of the object so that the force of the moving viscous fluid can be efficiently applied to the object.

(3) A door-shaped member that opens and closes in the vertical direction is provided at the outlet on the bottom side (elastic body side) of the hole of the piston portion, and the hole is closed when the door-shaped member is closed, and a hole is opened when the door-shaped member is opened. To open. When the door-shaped member closes and the hole is closed, the cross-sectional area of the hole becomes smaller. The door-shaped member is pushed by the viscous fluid to open and close when the piston portion moves up and down. With this configuration, when the piston portion descends, the door-shaped member is pushed upward by the viscous fluid, and the door-shaped member closes to completely close the hole, so that the cross-sectional area of the hole becomes small. On the other hand, when the piston portion rises, the door-shaped member is pushed downward by the viscous fluid, and the door-shaped member is opened to open a hole, so that the cross-sectional area of the hole is increased.
The number of door-shaped members may be only one, or may be divided into a plurality of members so as to surround the hole.

Further, since the above-mentioned viscoelastic damper is intended to support the object, at least one is installed at a position where the object is supported from below. As a result, the load of the object can be supported by the viscoelastic damper.

When the object to be supported is a pipe or the like, the viscoelastic damper can be installed at a position where the object is supported from above or at a position where the object is supported from the side. ..
However, the above-mentioned mechanism for changing the cross-sectional area of the hole of the piston portion is effective particularly when it is installed at a position where the object is supported from below. If a viscoelastic damper is installed at a position that supports the object from above or at a position that supports the object from the side, whether to change the configuration of the mechanism so that it matches the direction in which the object is supported. , The mechanism is not provided.

According to the configuration of the viscoelastic damper of the present invention, a mechanism capable of engaging the piston portion and the top plate portion in a contactable manner and changing the height from the bottom of the piston portion to the top plate of the top plate portion. It has a part. By changing the height from the bottom of the piston part to the top plate of the top plate part by this mechanism part, the state of the elastic body connected to the piston part is changed, and the magnitude of the elastic force acting from the elastic body part is large. Can be changed.
As a result, the height from the bottom of the piston portion to the top plate of the top plate portion can be changed by adjusting the mechanical portion without disassembling the viscoelastic damper, and the load supported by the viscoelastic damper can be adjusted. ..

Further, according to the configuration of the viscoelastic damper of the present invention, the top plate of the top plate comes into contact with the object to be supported by the movement of the piston portion by the elastic force of the elastic body, so that the top plate is the object. The object can be supported without constraining heat transfer.

Further, according to the configuration of the viscoelastic damper of the present invention, since the piston portion is provided with a hole for the viscous fluid to pass when the piston portion moves, the movement of the piston portion is caused by the viscous fluid passing through the hole. Viscous resistance is generated.
As a result, the viscous resistance can attenuate the vibration of the object in the same direction as the piston portion moves, so that the seismic response of the object can be reduced.

According to the configuration of the viscoelastic damper of the present invention, from the above, the self-weight load of the object can be adjusted regardless of the amount of heat transfer of the object supported by the viscoelastic damper, and the seismic response of the object can be adjusted. Can be reduced.

Further, when the hole of the piston portion moves in the direction toward the object, the cross-sectional area of the hole becomes large, and when the piston portion moves away from the object, the cross-sectional area of the hole becomes small. When the structure has such a mechanism, the cross-sectional area of the hole can be changed to change the magnitude of the viscous resistance generated in the hole.
As a result, the viscous resistance can be increased to greatly attenuate the vibration of the object, or the viscous resistance can be decreased to make it easier for the piston portion to follow the movement of the object.

Hereinafter, specific examples of the present invention will be described with reference to the drawings.

(Example 1)
Hereinafter, the viscoelastic damper according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 2.
FIG. 1 is a fracture side view showing the entire view of the viscoelastic damper according to the first embodiment of the present invention.

The viscoelastic damper 1 shown in FIG. 1 is a viscoelastic damper for supporting the pipe 100.
The viscoelastic damper 1 includes a top plate 2, a piston portion 4, a housing portion 5, and a coil spring 6, and is installed on the building floor 11.

The top plate 2 has a horizontal plate shape and comes into contact with the pipe 100 from below.
Further, the top plate portion 3 is formed by the top plate 2 and the connecting portion 3a extending downward from the top plate 2.

The piston portion 4 has a lower plate 4a, a flow rate adjusting hole 4b, a main shaft portion 4c, an upper plate 4d, and a housing portion 4e.
The lower plate 4a has a horizontal plate shape, for example, is formed in a disk shape.
The flow rate adjusting holes 4b penetrate the lower plate 4a, and two or more of the flow rate adjusting holes 4b are provided in the lower plate 4a.
The main shaft portion 4c is formed so as to extend vertically, the lower end portion is connected to the lower plate 4a, and the upper end portion is connected to the upper plate 4d.
The upper plate 4d has a horizontal plate shape, for example, is formed in a disk shape. The upper plate 4d is formed to have a larger width (diameter when both the lower plate 4a and the upper plate 4d are disk-shaped) than the lower plate 4a.
The accommodating portion 4e is provided on the upper plate 4d and accommodates the connecting portion 3a of the top plate portion 3.

The housing portion 5 is composed of a housing-shaped main body portion 5a and a bottom plate 5b under the main body portion 5a, and a hole 5c is formed in the central portion of the upper surface of the main body portion 5a.
The housing portion 5 contains a viscous fluid in a space surrounded by the main body portion 5a and the bottom plate 5b.
Further, the piston portion 4 is attached so as to pass through the hole 5c of the housing portion 5. That is, the upper plate 4d of the piston portion 4 is outside the housing portion 5, but the lower plate 4a is inserted inside the housing portion 5. The lower plate 4a divides the space inside the housing portion 5 into an upper space 7a and a lower space 7b.

The coil spring 6 is housed inside the housing portion 5, is connected to the lower plate 4a of the piston portion 4, and is installed on the bottom plate 5b of the housing portion 5.
The coil spring 6 is attached between the lower plate 4a and the bottom plate 5b in a state of being contracted by its natural length. That is, due to the elastic force of the coil spring 6, the lower plate 4a of the piston portion 4 separates from the bottom plate 5b of the housing portion 5 and acts in the direction toward the pipe 100, which is the object to be supported (upward in the case of FIG. 1). Force is applied. As a result, the viscoelastic damper 1 can support the own weight load of the pipe 100 by the elastic force of the coil spring 6.

Further, in the viscoelastic damper 1 of the present embodiment, the flow rate adjusting hole 4b of the piston portion 4 has a mechanism for changing the cross-sectional area of the flow rate adjusting hole 4b. By this mechanism, the cross-sectional area of the flow rate adjusting hole 4b changes, the flow rate of the viscous fluid passing through the flow rate adjusting hole 4b changes, and the viscous resistance to the viscous fluid changes.
In this mechanism, when the viscous fluid moves from the upper space 7a to the lower space 7b, the cross-sectional area of the flow rate adjusting hole 4b becomes large and the viscous resistance is reduced, and conversely, the viscous fluid moves from the lower space 7b to the upper space 7a. When moving, the cross-sectional area of the flow rate adjusting hole 4b becomes smaller and the viscous resistance is increased.
By this mechanism, the viscoelastic damper 1 applies a reaction force when the pipe 100 moves downward to attenuate the vertical vibration due to an earthquake or the like.
That is, when the pipe 100 moves downward, the top plate 2 and the piston portion 4 move downward (in the direction away from the pipe 100), and the viscous fluid in the lower space 7b moves to the upper space 7a through the flow rate adjusting hole 4b. By doing so, the viscous resistance acts upward on the piston portion 4. At this time, the flow rate adjusting hole 4b has a smaller cross-sectional area to generate a larger viscous resistance. In addition, the elastic force of the coil spring 6 also acts upward. The vibration of the pipe 100 is damped by these reaction forces.
On the other hand, when the pipe 100 moves upward, the piston portion 4 is pushed upward (in the direction toward the pipe 100) by the elastic force of the coil spring 6, and the viscous fluid in the upper space 7a passes through the flow rate adjusting hole 4b in the lower space 7b. Move to. At this time, since the cross-sectional area of the flow rate adjusting hole 4b is increased, the viscous resistance generated is reduced, and the movement of the piston portion 4 is less likely to be hindered. As a result, the top plate 2 and the piston portion 4 can follow the rise of the pipe 100.
In this way, by generating a reaction force when the pipe 100 is lowered, the effect of attenuating the vibration is exhibited.

As the configuration of the flow rate adjusting hole 4b for changing the cross-sectional area of the flow rate adjusting hole 4b, it is possible to adopt various configurations such as the configuration in which the cross-sectional area of the holes (1) to (3) described above changes. can. That is, for example, an object (plug) having a width larger than the width of the flow rate adjusting hole 4b and a space provided in the middle of the flow rate adjusting hole 4b to accommodate the object are provided, or provided on the bottom side of the flow rate adjusting hole 4b. Provide a door-shaped member.

Further, in the viscoelastic damper 1 of the present embodiment, the connecting portion 3a of the top plate portion 3 and the accommodating portion 4e or the upper plate portion 4d of the piston portion 4 are connected to the lower plate portion 4a to the top plate portion 3 of the piston portion 4. A mechanism is provided that can adjust the height H up to the top plate 2.
By this mechanism, the height of the space 8 between the connecting portion 3a of the top plate portion 3 and the upper plate portion 4d of the piston portion 4 changes, and as a result, the lower plate 4a of the piston portion 4 to the top plate portion The height H up to the top plate 2 of 3 also changes.

The structure of the mechanism for adjusting so that the height H of the space 8 changes and the height H from the lower plate 4a of the piston portion 4 to the top plate 2 of the top plate portion 3 changes is the screw and the turn described above. Various configurations such as buckles and slits can be adopted.

In the fracture side view shown in FIG. 1, the space 8 is lowered and the height H is adjusted to be small.
On the other hand, FIG. 2 is a fracture side view showing a state in which the space 8 is raised and the height H is adjusted to be increased.

When the space 8 is raised and the height H is adjusted to be increased, as shown in FIG. 2, the piston portion 4 moves downward with respect to the pipe 100, the coil spring 6 is contracted, and a larger elastic force is obtained. Will act upwards.
On the other hand, when the space 8 is lowered and the height H is adjusted to be small, as shown in FIG. 1, the coil spring 6 is stretched and a smaller elastic force acts upward.
By adjusting the height H by changing the height of the space 8 in this way, the magnitude of the elastic force acting on the coil spring 6 can be adjusted, and the load supported by the viscoelastic damper 1 can be adjusted.

Heat transfer due to thermal expansion may occur in the pipe 100 due to a temperature change during plant operation or the like.
However, in the viscoelastic damper 1 of this embodiment, since the top plate 2 is only in contact with the pipe 100 and is not fixed, the pipe 100 in the left-right direction and the direction perpendicular to the paper surface of FIGS. 1 to 2 The viscoelastic damper 1 does not apply a reaction force to the pipe 100 against heat transfer.
On the other hand, with respect to the heat transfer of the pipe 100 in the vertical direction, the top plate 2 and the piston portion 4 move up and down as the pipe 100 moves, and the coil spring 6 expands and contracts, so that the elastic force changes. Therefore, by setting the spring constant of the coil spring 6 to be sufficiently small, the change in elastic force can be made small, and the reaction force against heat transfer can be made negligible. In this way, it is preferable to have a mechanism that does not restrain the heat transfer of the pipe 100.

According to the configuration of the viscoelastic damper 1 of this embodiment, the piston portion 4 and the top plate portion 3 are engaged with each other so as to be in contact with each other, and the height H from the bottom of the piston portion 4 to the top plate 2 of the top plate portion 3 It is equipped with a mechanical part that can change. By changing the height of the space 8 between the connecting portion 3a of the top plate portion 3 and the upper plate portion 4d of the piston portion 4, this mechanical portion changes the height of the space 8 from the bottom of the piston portion 4 of the piston portion 4 to the top plate portion 3 The height H up to the top plate 2 can be changed.
By changing the height H by this mechanical portion, the state of the coil spring 6 connecting the housing portion 5 and the piston portion 4 can be changed, and the magnitude of the elastic force acting on the coil spring 6 can be changed.
As a result, the height H from the bottom of the piston portion 4 to the top plate 2 of the top plate portion 3 can be changed by adjusting the mechanical portion without disassembling the viscoelastic damper 1, and the viscoelastic damper 1 can be formed. The supporting load can be adjusted.

Further, according to the configuration of the viscoelastic damper 1 of this embodiment, the top plate 2 of the top plate portion 3 comes into contact with the pipe 100 which is the object to be supported by the elastic force of the coil spring 6, so that the top plate 2 is a pipe. The pipe 100 can be supported without constraining the heat transfer of the 100.

Further, according to the configuration of the viscoelastic damper 1 of the present embodiment, when the piston portion 4 moves up and down, the viscous fluid moves through the flow rate adjusting hole 4b provided at the bottom of the piston portion 4, and the viscous fluid moves through the flow rate adjusting hole. The viscous fluid passing through 4b causes viscous resistance to the movement of the piston portion 4.
As a result, the viscous resistance can attenuate the vibration of the vertical pipe 100 that moves the piston portion 4, so that the seismic response of the pipe 100 can be reduced.

Furthermore, according to the configuration of the viscoelastic damper 1 of the present embodiment, when the flow rate adjusting hole 4b of the piston portion 4 rises, the cross-sectional area of the hole increases, and when the piston portion 4 descends, the cross-sectional area of the hole increases. Has a mechanism to reduce the cross-sectional area of the hole. By this mechanism, the cross-sectional area of the hole can be changed to change the magnitude of the viscous resistance generated in the hole.
As a result, the viscous resistance can be increased to greatly attenuate the vibration of the pipe 100, or the viscous resistance can be reduced to make it easier for the piston portion 4 to follow the movement of the pipe 100.

According to the configuration of the viscoelastic damper 1 of this embodiment, from the above, the own weight load of the pipe 100 can be adjusted regardless of the amount of heat transfer of the pipe 100 supported by the viscoelastic damper 1, and the weight of the pipe 100 can be adjusted. Seismic response can be reduced.

(Example 2)
Next, the viscoelastic damper of Example 2 of the present invention will be described with reference to FIG. In FIG. 3, the same reference numerals as those in FIGS. 1 and 2 indicate the same parts, and thus the description thereof will be omitted again.

In the first embodiment, assuming that the space between the pipe 100 and the building floor 11 is narrow, the viscoelastic damper 1 is installed on the building floor 11.
In the second embodiment, the viscoelastic damper is fixed to the frame 12 fixed to the building floor 11, and the viscoelastic damper is installed both above and below the pipe 100, which is a change as compared with the first embodiment. It is a point.
FIG. 3 is a schematic side view showing the whole picture of the viscoelastic damper according to the second embodiment of the present invention.

As shown in FIG. 3, the second embodiment is the same as the first embodiment in that the viscoelastic damper 1 is installed below the pipe 100 so that the top plate 2 is in contact with the pipe 100.

In this embodiment, the viscoelastic damper (second viscoelastic damper) 21 having the same configuration as the viscoelastic damper 1 is above the pipe 100, and the viscoelastic damper (first viscoelastic damper) 1 is above and below. It is installed in the opposite direction.
That is, the viscoelastic damper (second viscoelastic damper) 21 is installed so that the bottom plate 5b is on the upper side and the top plate 2 is on the lower side and comes into contact with the lower pipe 100.
By installing the viscoelastic damper 21 above the pipe 100 in this way, when a vertical vibration occurs in the pipe 100 due to an earthquake or the like, a reaction force can be generated both when the pipe 100 is raised and when the pipe 100 is lowered. , The effect of vibration damping can be enhanced.

The viscoelastic damper (second viscoelastic damper) 21 provided above the pipe 100 of this embodiment has a viscoelastic damper provided below the pipe 100 in a direction of response to vibration or movement of the pipe 100. The direction is upside down from the damper (first viscoelastic damper) 1. Therefore, in the viscoelastic damper (second viscoelastic damper) 21, the mechanism by which the cross-sectional area of the flow rate adjusting hole 4b of the viscoelastic damper (first viscoelastic damper) 1 changes is the viscoelastic damper (first viscoelastic damper). It does not work in the same way as the elastic damper) 1.
Therefore, in the viscoelastic damper (second viscoelastic damper) 21, the configuration of the mechanism in which the cross-sectional area of the hole changes according to the direction of the response to the vibration or movement of the pipe 100 is changed, or the hole is cut. A normal hole whose cross-sectional area does not change is used without providing a mechanism for changing the area.

According to the configuration of this embodiment, the viscoelastic damper 1 installed below the pipe 100 makes the pipe irrespective of the amount of heat transfer of the pipe 100 supported by the viscoelastic damper 1, as in the configuration of the first embodiment. The own weight load of 100 can be adjusted, and the seismic response of the pipe 100 can be reduced.

Further, according to the configuration of this embodiment, since the viscoelastic damper 21 is installed above the pipe 100, the pipe 100 is combined with the viscoelastic damper 1 when the pipe 100 vibrates vertically due to an earthquake or the like. A reaction force can be generated both when ascending and when descending 100.
As a result, the effect of vibration damping can be enhanced as compared with the case where the viscoelastic damper 1 is installed only below the pipe 100.

(Modification example)
In the first embodiment, one viscoelastic damper 1 was arranged below the pipe 100, and in the second embodiment, a total of two viscoelastic dampers 1 and 21 were installed below and above the pipe 100, respectively.
The number of viscoelastic dampers installed on the pipe is not limited to one or two. For example, as in the wire rope seismic support of Patent Document 1, a total of four viscoelastic dampers are installed on the top, bottom, left and right of the pipe. It is also possible to do.

In Examples 1 and 2, the object supported by the viscoelastic dampers 1 and 21 was the pipe 100.
The viscoelastic damper of the present invention is not limited to the use of supporting the piping system, and can be applied to the use of supporting other objects. For example, the viscoelastic damper of the present invention can also be applied to a support application for a building or other heavy object.

In Example 1, a flow rate adjusting hole 4b having a mechanism capable of changing the cross-sectional area of the hole was provided at the bottom of the piston portion 4 of the viscoelastic damper 1.
Instead of the flow rate adjusting hole 4b of the first embodiment, a hole having a constant cross-sectional area without changing the cross-sectional area can be provided at the bottom of the piston portion of the viscoelastic damper. Even when a hole having a constant cross-sectional area is provided, the viscous fluid passing through the hole can generate viscous resistance against the movement of the piston portion to attenuate the vibration of the object in the direction in which the piston portion moves. The seismic response of the object can be reduced.

The present invention is not limited to the above-described embodiments and examples, and includes various modifications. For example, the above-described embodiments and examples have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations.

1,21 Viscoelastic damper, 2 Top plate, 3 Top plate part, 3a Connection part (with piston part) of top plate part, 4 Piston part, 4a Lower plate of piston part, 4b Flow adjustment of lower plate of piston part Hole, 4c Piston part main shaft part, 4d Piston part upper plate, 4e Piston part accommodating part, 5 Housing part, 5a Housing part main body part, 5b Housing part bottom plate, 5c Housing part upper hole, 6 coil spring, 7a Space above the lower plate of the piston part, 7b Space below the lower plate of the piston part, 8 Space between the connection part of the top plate part and the upper plate of the piston part, 11 Building floor, 12 frames, 100 Pistons

Claims (6)

The housing that contains the viscous fluid and
The piston part inserted into the housing part and
An elastic body housed inside the housing portion and connected to the piston portion,
A top plate portion having a plate-shaped top plate and provided on the side of the piston portion opposite to the housing portion, and a top plate portion.
The piston portion and the top plate portion are engaged with each other in a contactable manner, and a mechanism portion capable of changing the height from the bottom of the piston portion to the top plate of the top plate portion is provided.
A hole for the viscous fluid to pass through when the piston portion moves is provided in the piston portion.
A viscoelastic damper in which the top plate of the top plate comes into contact with an object to be supported by moving the piston portion by the elastic force of the elastic body. The viscoelastic damper according to claim 1, wherein the elastic body exerts an elastic force in a direction in which the piston portion faces the object. The mechanical portion is composed of screws provided on the piston portion and the top plate portion, respectively, and by rotating the screws provided on the top plate portion, the top plate portion is described from the bottom of the piston portion. The viscoelastic damper according to claim 1, wherein the height to the top plate changes. The hole has a large cross-sectional area when the piston portion moves toward the object, and the hole has a cross-sectional area when the piston portion moves away from the object. The viscoelastic damper according to claim 1, which has a mechanism for reducing the size of the damper. The viscoelastic damper according to claim 1, wherein the object to be supported is a pipe, and at least the pipe is installed at a position where the pipe is supported from below. The viscoelastic damper according to claim 1, wherein the elastic body is a spring.

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