JP6499049B2 - Vibration control device - Google Patents

Description

  Embodiments described herein relate generally to a vibration damping device that reduces vibration of a structure.

2. Description of the Related Art Conventionally, there is known a vibration damping device that attenuates response vibration of a structure with respect to input vibration such as an earthquake using flow resistance of a fluid passing through an orifice passage or the like.
As such a vibration control device, for example, an orifice passage that allows fluid to flow bidirectionally and a passage with a check valve that allows fluid to flow only in one direction are formed in a piston disposed inside the fluid damper. There is something.

JP-A-11-141186

  However, in the above-described vibration damping device, when a vibration damping force is applied to a structure that is displaced upward, it is necessary to fix the vibration damping device with respect to the foundation to prevent lifting.

  The embodiment of the present invention has been made in consideration of such circumstances, and an object thereof is to provide a vibration damping device that is easy to install and can prevent lifting.

  A vibration damping device according to an embodiment of the present invention is mounted on a top surface of a base body that supports a structure, and a casing is filled with a fluid, and a cylinder that is fixed to the casing and is erected. A piston having at least one end slidably disposed on the inner side of the cylinder and having the other end protruding from the cylinder and contacting the structure; and an inner side and an outer side of the cylinder according to the displacement of the piston provided on the cylinder An orifice passage that allows the fluid to flow in both directions, and a check valve that is provided in the cylinder and that allows the fluid to flow only in one direction from the outside to the inside of the cylinder in accordance with the displacement of the piston. Features.

  The embodiment of the present invention provides a vibration damping device that is easy to install and can prevent lifting.

1 is a longitudinal sectional view showing a vibration damping device according to a first embodiment of the present invention. The longitudinal cross-sectional view which shows the damping device which concerns on 2nd Embodiment of this invention. The longitudinal section showing the vibration damping device concerning a 3rd embodiment of the present invention. The longitudinal section showing the vibration damping device concerning a 4th embodiment of the present invention.

(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, the vibration damping device 10 </ b> A according to the first embodiment is mounted on the casing 13 that is placed on the upper surface of the base body 12 that supports the structure 11 and is filled with fluid. A cylinder 15 fixed and standing, a piston 16 having at least one end slidably disposed inside the cylinder 15 and having the other end projecting from the cylinder 15 and contacting the structure 11, and the cylinder 15 are provided. An orifice passage 17 for flowing the fluid 14 in both directions inside and outside the cylinder 15 in accordance with the displacement of the piston 16, and one direction from the outside of the cylinder 15 to the inside in accordance with the displacement of the piston 16 provided in the cylinder 15. And a check valve 18 for allowing only the fluid 14 to flow.

Here, the structure 11 includes a building, plant equipment, heavy equipment, etc., but there is no particular limitation, and all structures 11 are included as long as they are objects to absorb vibration energy to be input and exert a damping action. . The foundation body 12 is a base for stably supporting the structure 11 with respect to a vibration source (for example, the ground).
Although not shown, a support member (not shown) for elastically supporting the weight of the structure 11 is disposed between the structure 11 and the base body 12 in parallel with the vibration damping device 10. ing.

The casing 13 is filled with a fluid 14 such as silicon oil. The fluid 14 can be appropriately employed as long as it generates a viscous resistance when flowing, and a gas can be used in addition to a liquid. Moreover, although the aspect which the upper part of the casing 13 is opening is illustrated, you may close this upper part and you may be in a sealed state.
Since the foundation body 12 and the casing 13 do not need to be fixed to each other, the casing 13 may be lifted from the upper surface of the foundation body 12 when the vibration acceleration of the foundation body 12 displaced in the vertical direction becomes excessively large. However, it is an object of this embodiment to avoid such a situation.

The inertial force due to the total weight of the casing 13 and the fluid 14 is considerably large. For this reason, if it fixes so that the casing 13 may not float from the base body 12, the high intensity | strength which bears such an inertial force is calculated | required by the fixing member.
However, in this embodiment, since such fixing is unnecessary, the scale of the vibration damping device 10 and the construction can be reduced.

  The cylinder 15 has a hollow cylindrical shape, and is fixed to the inner surface of the casing 13 so that the center axis thereof coincides with the vertical direction. Although the aspect in which the lower end of the cylinder 15 is fixed to the bottom surface of the casing 13 is shown in the drawing, the method for fixing the cylinder 15 to the casing 13 is not particularly limited.

An orifice passage 17 is provided at the lower end of the cylinder 15.
The orifice passage 17 is composed of a hole penetrating the wall so that the inner side and the outer side of the cylinder 15 communicate with each other, and a flow path extending from the outer peripheral surface of the cylinder 15 starting from this hole. As the piston 16 is displaced in the longitudinal direction, the fluid 14 can flow through the orifice passage 17 in both directions inside and outside the cylinder 15.
The flow resistance of the fluid 14 in the orifice passage 17 is the same regardless of whether the flow direction is from the inside to the outside or vice versa. The flow resistance can be adjusted as appropriate by changing the diameter of the hole and the length of the flow path.

The check valve 18 is installed at an opening provided at a position different from the position where the orifice passage 17 is provided at the lower end of the cylinder 15.
The check valve 18 closes or opens the opening of the cylinder 15 when a plate-like body that rotates around a hinge provided on one side operates according to the flow of the fluid 14.
That is, when the internal pressure of the cylinder 15 is larger than the external pressure, the plate-like body stands up and the check valve 18 is closed. When the internal pressure is small compared to the external pressure, the plate-like body falls down and reverses. The stop valve 18 is in an open state.

In this way, the check valve 18 can cause the fluid 14 to flow only in one direction from the outside to the inside of the cylinder 15 as the piston 16 is displaced.
Note that the opening of the check valve 18 is set sufficiently large as compared with the opening of the orifice passage 17, and the flow resistance of the fluid 14 flowing from the outside of the cylinder 15 to the inside can be reduced.

When the piston 16 is displaced in the vertical direction, the mechanical friction force generated between the outer peripheral surface of the piston 16 and the inner peripheral surface of the cylinder 15 is reduced, and the fluid 14 does not slip through the gap. Appropriate dimensions are set. Furthermore, the dimensions in the length direction of the piston 16 and the cylinder 15 are set in consideration of the magnitude of the assumed vibration amplitude.
A tip 16 a of the piston 16 on the side protruding from the cylinder 15 is fixed to the structure 11. That is, in a state where no vibration force is input, the structure 11 is supported by the support member (not shown) with respect to the base body 12, and the piston 16 is supported by the structure 11.

Here, an operation when vibration such as an earthquake is input to the foundation body 12 will be described.
When the base body 12 is displaced upward, the piston 16 receives inertial force from the structure 11 and is displaced downward relative to the cylinder 15. As a result, the fluid 14 inside the cylinder 15 is pressurized and the check valve 18 is closed, so that only the orifice passage 17 passes and the fluid 14 escapes from the inside to the outside.
As described above, when the piston 16 is displaced relatively downward, the flow resistance of the fluid 14 that flows from the inside of the cylinder 15 to the outside increases, so that the vibration energy that propagates to the structure 11 is greatly attenuated.

  Next, when the base body 12 is displaced downward, the cylinder 15 and the casing 13 are subjected to gravity combined with their own weight and the fluid 14 and are displaced downward relative to the piston 16. As a result, the fluid 14 in the cylinder 15 is depressurized and the check valve 18 is opened, so that the fluid 14 passes through both the check valve 18 and the orifice passage 17 and escapes from the outside to the inside.

Thus, when the cylinder 15 is displaced relatively downward, the flow resistance of the fluid 14 that flows from the outside to the inside of the cylinder 15 becomes low. For this reason, the casing 13 can follow the movement of the foundation body 12 without lifting from the foundation body 12.
In this way, the vibration displacement of the base body 12 and the relative vibration displacement between the cylinder 15 and the piston 16 can be brought close to each other in a direction to be matched, so that a high vibration damping effect of the structure 11 can be obtained.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. 2 that have the same configuration or function as those in FIG. 1 are denoted by the same reference numerals and redundant description is omitted.
As shown in FIG. 2, the vibration damping device 10B according to the second embodiment further includes an elastic member 21 in addition to the configuration of the vibration damping device 10A according to the first embodiment.
The elastic member 21 is disposed along the longitudinal direction inside the cylinder 15, has a fixed end 21 b on the bottom surface side of the casing 13, and has a free end 21 a that is stationary at a position facing the piston 16. Yes.

In the second embodiment, the upper end of the elastic member 21 is not restrained by the piston 16. However, when the base body 12 is displaced upward, the piston 16 is relatively displaced downward with respect to the cylinder 15. Compress.
Next, when the foundation body 12 is displaced downward, the cylinder 15 and the casing 13 receive the repulsive force of the elastic member 21 downward in addition to the gravity that combines the weight and the fluid 14.
Then, the cylinder 15 is relatively displaced downward with respect to the piston 16, and when the elastic member 21 reaches the balance length, the free end 21a of the elastic member and the piston 16 are separated. Since the upper end of the elastic member 21 is not restrained by the piston 16, it does not give a restoring force to the cylinder 15 that is about to be displaced relatively downward.

Thereby, even if the vibration acceleration of the base body 12 is large, the casing 13 can follow the movement without leaving the base body 12.
In this way, the vibration displacement of the base body 12 and the relative vibration displacement between the cylinder 15 and the piston 16 can be brought close to each other in a direction to be matched, so that a high vibration damping effect of the structure 11 can be obtained.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. 3 that have the same configuration or function as those in FIG. 1 are denoted by the same reference numerals and redundant description is omitted.
As shown in FIG. 3, the vibration damping device 10 </ b> C according to the third embodiment is characterized by the configuration of the orifice passage 17.
In the orifice passage 17, a plurality of openings 31 are arranged at intervals along the longitudinal direction on the inner peripheral surface of the cylinder 15, and the flow of the fluid 14 in the opening 31 blocked by the displacement of the piston 16 stops. Is configured to do.

By configuring the orifice passage 17 in this manner, the flow resistance of the fluid 14 flowing in and out of the cylinder 15 increases as the insertion amount of the piston 16 into the cylinder 15 increases.
Here, when the amplitude of vibration input to the base body 12 is large, in the first embodiment and the like, it is necessary to set the strokes of the cylinder 15 and the piston 16 to be long in accordance with the assumed amplitude of vibration.

  This is because if the stroke of the cylinder 15 or the like is shorter than the amplitude of vibration, the piston 16 may come off or hit the cylinder 15 before the vibration displacement peaks. Therefore, by setting the flow resistance of the fluid 14 to increase as the vibration amplitude increases, the vibration damping effect can be effectively exhibited from a small amplitude to a large amplitude.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. 4, parts having the same configuration or function as those in FIG. 1 are denoted by the same reference numerals and redundant description is omitted.
As shown in FIG. 4, in the vibration damping device 10 </ b> C according to the fourth embodiment, a rolling support body 41 is provided between the casing 13 and the base body 12 in addition to the configuration of the vibration damping device according to another embodiment. It has been.

In addition, although illustration is abbreviate | omitted, you may comprise so that the contact part of the front-end | tip 16a of a piston and the structure 11 may be displaced relatively in a horizontal direction.
By configuring the vibration damping device 10C in this manner, even if horizontal vibration is applied to the foundation body 12, the vibration damping device 10C can be prevented from being overturned and damaged.

  According to the vibration damping device of at least one embodiment described above, a check valve can be provided in the cylinder, and the flow resistance of the fluid can be varied depending on the direction of vibration displacement. A vibration device can be provided.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, changes, and combinations can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  10 (10A, 10B, 10C, 10D) ... damping device, 11 ... structure, 12 ... base body, 13 ... casing, 14 ... fluid, 15 ... cylinder, 16 ... piston, 16a ... tip of piston, 17 ... orifice A passage 18, a check valve, 21, an elastic member, 21 a, a free end of the elastic member, 21 b, a fixed end of the elastic member, 31, an opening 41, a rolling support.

Claims (5)

A casing that is placed on the upper surface of the base body that supports the structure and is filled with fluid;
A cylinder that is fixed and standing with respect to the casing;
A piston having at least one end slidably disposed inside the cylinder and the other end protruding from the cylinder and contacting the structure;
An orifice passage provided in the cylinder for flowing the fluid in both directions inside and outside the cylinder in accordance with the displacement of the piston;
And a check valve that is provided in the cylinder and causes the fluid to flow only in one direction from the outside to the inside of the cylinder in accordance with the displacement of the piston. The vibration damping device according to claim 1,
The vibration control device, wherein the orifice passage has a flow path extending from an outer peripheral surface of the cylinder. The vibration damping device according to claim 1 or 2,
An elastic member that is disposed along the longitudinal direction inside the cylinder, has a fixed end on the bottom surface side of the casing, and has a free end that rests at a position facing the one end of the piston; Damping device characterized by The vibration damping device according to any one of claims 1 to 3,
In the orifice passage, a plurality of openings are arranged at intervals along the longitudinal direction on the inner peripheral surface of the cylinder, and the fluid flow in the openings blocked by the displacement of the piston is stopped. The vibration damping device is characterized by being configured. The vibration damping device according to any one of claims 1 to 4,
A vibration damping device, further comprising a rolling support between the casing and the base body.

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