JPH07224881A - Micro-vibration suppressing device - Google Patents

Abstract

PURPOSE:To effectively suppress the generation of micro-vibration by providing a first container which is connected to an object to be vibrated and caused to change an amount of stored fluid through expansion and contraction, a second container which is connected in parallel thereto and is caused to absorb the fluctuation of internal fluid, and a control means which is located between the two containers and exerts insertion resistance on internal fluid. CONSTITUTION:When an object B to be vibrated is moved toward a support structure C, since a device A is compressed on the whole and the volume of a first container 1 is reduced, internal fluid R flows through the orifice 33 of a control means 3 to a second container 2. When the pressure of the internal fluid R is increased since the internal fluid R is noncompressible, internal gas of a gas chamber 4 is compressed, and the size of the second container 2 is allowed. When the object B to be vibrated is separated away from a support structure C, a device is stretched on the whole, the volume of the first container 1 is increased, the internal fluid R of the second container 2 flows in the first container 1, the pressure of internal gas of a gas chamber 4 is decreased, and the increase of the size of the second container 2 is allowed. Thus, suppression of the generation of micro-vibration is practicable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microvibration suppressing device, and more particularly to a technique for achieving miniaturization of the device and controlling the vibration suppressing effect.

[0002]

2. Description of the Related Art As an example of a device for suppressing vibration of a pipe or various devices connected to the pipe, a vibration suppressing device,
Application of an oil damper, Japanese Utility Model Laid-Open No. 1-63843,
Japanese Utility Model Publication No. 1-141939, Japanese Utility Model Publication No. 3-65095.
Japanese Patent Laid-Open No. 4-119291 and Japanese Patent Laid-Open No. 4-119291 are proposed.

[0003]

However, although these techniques can suppress the vibration of linear reciprocating motion and rotary motion, they change the vibration suppressing effect in accordance with the degree of vibration acceleration, and large vibration. It was insufficient in terms of obtaining the suppressing effect.

The present invention has been proposed in view of the above circumstances, and effectively suppresses vibration with respect to minute vibrations.
The purpose of the present invention is to enable control of the vibration suppressing action and to achieve miniaturization of the device.

[0005]

As a device for suppressing the vibration of a vibrating object by interposing a vibrating object and a support structure in a connected state, the amount of stored fluid changes due to expansion and contraction of the vibrating object. A first container, a second container that is connected to the first container and absorbs fluctuations in the internal fluid, and an internal container that is disposed between the first container and the second container. A control unit that exerts insertion resistance on the fluid is provided, and a configuration in which the first container and the second container are arranged in parallel is adopted. The first container and the second container are arranged in concentric circles as needed,
Moreover, the first container and the second container are formed by bellows. The internal fluid is made to be an electrorheological fluid if necessary, and a control means for the electrorheological fluid is added, and the control means includes an orifice through which the internal fluid is inserted, and an electrode arranged near the orifice for energizing the electrorheological fluid It is equipped with. The electrodes are arranged in the vicinity of the orifice so as to face each other in the vibration suppressing direction. A gas chamber that is deformed by the pressure of the internal fluid is arranged inside the second container.

[0006]

The microvibration suppressing device is interposed between the object to be vibrated and the support structure in a connected state to suppress the vibration of the object to be vibrated.
When the first container and the second container are arranged in parallel, the dimension in the vibration suppressing direction becomes small. By combining the first container and the second container in a concentric state, further miniaturization is achieved, and when the outer wall portions of the first container and the second container are formed by bellows, The elasticity and the tightness of the internal fluid are obtained, and the fluidity of the internal fluid is enhanced. When the internal fluid is an electrorheological fluid, the electrodes are energized by the operation of the control means, and the resistance value through the orifice is greatly changed by adjusting the viscosity of the electrorheological fluid, so that vibration suppression is controlled. At this time, the electrode is arranged in the vicinity of the orifice to adjust the insertion resistance of the internal fluid in a necessary portion for inserting the orifice.
The volume of the gas chamber changes according to the pressure of the internal fluid of the second container, and absorbs the fluctuation of the stored fluid amount of the internal fluid.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a microvibration suppressing device according to the present invention will be described with reference to FIGS. In the figure, reference numeral A is a microvibration suppressing device, B is an object to be vibrated, C is a support structure, 1 is a first container, 2 is a second container, 3 is control means,
4 is a gas chamber and R is an internal fluid.

The microvibration suppressing device A is interposed between the object to be vibrated B and the support structure C in a connected state, and the connecting direction of these is a vibration suppressing direction to suppress the vibration of the object to be vibrated B. As shown in FIG. 1, the first container 1 and the second container 2
The container 2, the control means 3, and the gas chamber 4 are combined. In this case, the object B to be vibrated is, for example, a pipe, and the supporting structure C is a structure such as a building having the ability to support the object B to be vibrated or a heavy object.

The first container 1 allows the fluctuation of the internal fluid R to flow in and out when the amount of stored fluid changes due to expansion and contraction. As shown in FIG. 1, the central position of the second container 2 The bellows 11 made of metal or the like and having a substantially cylindrical shape is disposed in the second container 2 and is integrally attached to the second container 2 with the control means 3 interposed.

The second container 2 is connected to the first container 1 to allow the fluctuation of the internal fluid R to flow in and out.
A bellows 21 made of metal or the like having a diameter larger than that of the first container 1 and having a substantially cylindrical shape so as to be equally spaced from the first container 1, and a bellows 21 integrally arranged at the tip of the bellows 21 to be vibrated. A mounting plate 22 attached to the object B, a fixed plate 23 integrally arranged at the base end of the bellows 21 and attached to the support structure C, and a bolt for attaching the mounting plate 22 and the fixed plate 23 to the vibrating object B. -Has a fastener 24 such as a nut. Then, inside the bellows 21, the second container 2, the control means 3 and the gas chamber 4 are housed in a sealed state.

As shown in FIG. 1, the control means 3 is arranged in an intervening state between the first container 1 and the second container 2 to set the insertion resistance of the internal fluid R. Yes,
A flange member 31 integrally attached to the bellows 21 of the second container 2 and spaced apart from the tip of the bellows 11 of the first container 1, and the flange member 31 and the tip of the bellows 11 of the first container 1. A partition plate 32 integrally formed of an electrically insulating plate so as to connect these between them, an orifice 33 formed in a rectangular hole shape at a plurality of positions of the partition plate 31, and a pair at the opening of the orifice 33. Electrodes 34A, 34B arranged in parallel so as to face each other and exerting an electric field on the internal fluid (electrorheological fluid) R
And have. In the example of FIG. 1, the electrode 34
A and 34B are arranged in an annular shape.

The gas chamber 4 is disposed inside the second container 2 and is deformed by the pressure of the internal fluid R. Inside the flexible annular bag, gas such as air is placed. The sealed one is applied, as shown in FIG.
Between the container 1 and the second container 2 and integrally with the bellows 21 in the second container 2.

The internal fluid R is, for example, an incompressible electrorheological fluid (a liquid crystal electrorheological fluid whose viscosity can be adjusted by applying an electric field from the outside, a silicone oil-based electrical insulating oil, and polymer fine particles colloidal. Particle-like electrorheological fluid etc. dispersed in a uniform shape, and filled in the first container 1 and the second container 2 in a filled state.

With the microvibration suppressing device A constructed in this way, when the object B to be vibrated, such as the above-mentioned pipe, is vibrating, the viscosity of the internal fluid R and the size of the opening area of the orifice 33 are large. Based on the above, vibration suppression such as minute amplitude is suppressed.

As shown by the arrow in FIG. 2, when the vibrating object B moves toward the supporting structure C, the microvibration suppressing device A is wholly compressed. When the first container 1 is compressed, the volume of the first container 1 is reduced, so that the internal fluid R filled therein passes through the orifice 33 in the control means 3 and is indicated by an arrow. So that it flows into the second container 2. At this time, when the pressure of the internal fluid R becomes high, the internal fluid R is incompressible, so that the internal gas of the gas chamber 4 is compressed and the apparent volume becomes small. Allow decrease.

FIG. 3 is a neutral state of the microvibration suppressing device A,
That is, the intermediate position of the expansion / contraction range is shown, and FIG. 4 shows the extended state of the microvibration suppression device A.

When the state of FIG. 2 is changed to the state of FIG. 4 through the state of FIG. 3, that is, when the object B to be vibrated moves in the direction away from the support structure C, the microvibration suppressing device A is used.
Is stretched overall. When the microvibration suppressing device A is expanded, the volume of the first container 1 increases, so that the internal pressure of the first container 1 decreases, and the internal fluid R of the second container 2 becomes the first fluid as shown by the arrow. It flows into the container 1. At this time, when the pressure of the internal fluid R becomes low, the pressure of the internal gas in the gas chamber 4 becomes low due to the incompressibility of the internal fluid R, and the apparent volume becomes large, and the second container 2 Allows an increase in size.

When the first container 1 and the second container 2 are combined in a concentric state, the size in the vibration suppressing direction is reduced and the size is reduced.
When the distance between the fixing plate 23 and the fixing plate 23 changes, the first container 1
And the internal fluid R of the second container 2 is simultaneously pressurized or depressurized, and the volume of the gas chamber 4 changes due to the pressure fluctuation, so that it passes through the control means 3 as shown by the arrow in FIG. 2 or 4. The internal fluid R is inserted.

The side walls of the outer walls of the first container 1 and the second container 2 are bellows 11, 2 as shown in FIG.
When formed by 1, the bellows 11 and 21 are
When the internal fluid R is rapidly moved due to expansion and contraction due to high dimensional change allowance in the expansion and contraction direction and radial dimensional change non-acceptability, and small vibrations or vibration frequencies are large. Responsiveness and vibration suppression effect are improved. In this case, by using the bellows 11 and 21, the sealing property of the internal fluid R becomes high.

Next, a supplementary description will be given of vibration control when the internal fluid R is an electrorheological fluid. When a potential difference of, for example, several kV is applied between the electrodes 34A and 34B, the above-described liquid crystal or particle electrorheological fluid causes the viscosity to instantaneously fluctuate substantially in proportion to the strength of the electric field. Therefore, the control means 3 is in an operating state (a state in which the electrodes 34A and 34B are energized).
In this case, the apparent viscosity of the internal fluid (electrorheological fluid) R near the orifice 33 is set by the electric field strength, and the insertion resistance of the electrorheological fluid R through the orifice 33 changes. Therefore, the vibration suppressing effect can be controlled by the presence or absence of the formation of the electric field and the electric field strength.
The vibration suppression effect in this case differs depending on the type of electrorheological fluid, but it is possible to perform control that is several times higher than the vibration suppression effect when there is no electric field. Therefore,
When an electrorheological fluid is used, in addition to suppressing vibration based on a constant viscosity when there is no electric field, it is possible to select to actively control the vibration suppressing effect when an electric field is applied.

In the example of FIG. 1, the electrodes 34A and 34B are arranged in parallel in an annular shape, and the orifice 3 having a square hole shape.
It is said to be 3. Therefore, an even electric field is applied to the electrorheological fluid in the vicinity of the orifice 33, the same viscosity is set at the opening of the orifice 33, and it is possible to control vibration suppression based on uniform insertion resistance. The same shape,
By arranging a plurality of square holes (orifices 33) of the same size evenly in the circumferential direction, the internal fluid R is inserted in a balanced state by the divided flow paths.

[Other Embodiments] In the microvibration suppressing device of the present invention, the following technique can be applied instead of the embodiment. a) In the first container 1 and the second container 2, the side wall is formed by a metal cylinder or the like, and a bellows 11 is formed in a part thereof.
Be distributed. b) The first container 1 and the second container 2 are divided into an arbitrary number or divided by partition walls. c) The gas chamber 4 is arranged in the central position, that is, the second container 2 is housed in the center of the first container 1 having a large diameter. d) The control means 3 is arranged in the vicinity of the support structure C, and the gas chamber 4 is arranged in the vicinity of the vibrating object B. e) The orifice 33 and the electrodes 34A and 34B are set to an arbitrary number. f) The orifice 33 and the electrodes 34A and 34B are arranged in a plurality of parallel slits, radials, staggered patterns, checkered patterns, and the like.

[0023]

The microvibration suppressing device according to the present invention has the following excellent effects. (1) By arranging the first container and the second container in parallel, it is possible to reduce the distance in the vibration suppressing direction and achieve miniaturization. (2) By combining the first container and the second container in a concentric state, further miniaturization can be achieved. (3) By arranging the control means between the plurality of first containers and the second container, it is possible to set the insertion resistance and suppress the vibration corresponding to the vibration amount and the vibration frequency. (4) By arranging the bellows on the outer wall portions of the first container and the second container, it is possible to obtain high elasticity and high tightness of the internal fluid. (5) By making the internal fluid an electrorheological fluid and arranging an electrode on the orifice, the viscosity of the electrorheological fluid can be adjusted according to the amount of energization to suppress the desired vibration, and the vibration suppression range can be reduced. Can be large. (6) By arranging the electrode in the vicinity of the orifice, the viscosity of the internal fluid in the necessary portion that passes through the orifice is concentrated and adjusted, and the electric field formation range is reduced to achieve highly efficient vibration suppression. You can (7) By arranging the gas chamber, it is possible to facilitate the movement of the internal fluid by the volume variation and improve the responsiveness when suppressing vibration. (8) By separating the gas chamber from the electrode, the viscosity of the internal fluid in the vicinity of the gas chamber can be kept low, and the volume fluctuation of the internal fluid can be quickly absorbed.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of a microvibration suppressing device according to the present invention.

FIG. 2 is a front cross-sectional view showing a situation of the minute vibration suppressing device of FIG. 1 during compression.

FIG. 3 is a front cross-sectional view showing a situation when the microvibration suppressing device of the example in FIG. 1 is in a neutral state.

FIG. 4 is a front cross-sectional view showing a situation when the microvibration suppressing device of FIG. 1 is extended.

[Explanation of symbols]

 A Micro vibration suppressor B Vibrating object C Support structure R Internal fluid (electrorheological fluid) 1 First container (inner container) 2 Second container (outer container) 3 Control means 4 Gas chamber 11 Bellows 21 Bellows 22 Mounting plate 23 Fixed plate 24 Fastener 31 Flange member 32 Partition plate 33 Orifice 34A, 34B Electrode

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area G05D 19/02

Claims (6)

[Claims] 1. A device for suppressing vibration of an object to be vibrated, which is connected between the object to be vibrated (B) and a support structure (C), and is a fluid stored by expansion and contraction connected to the object to be vibrated. A first container (1) having a variable amount, a second container (2) connected to the first container for absorbing a fluctuation of the internal fluid (R), a first container and a second container And a control means (3) which is interposed between the first container and the second container to exert insertion resistance on the internal fluid, and the first container and the second container are arranged in parallel to each other. Suppressor. 2. The microvibration suppressing device according to claim 1, wherein the first container (1) and the second container (2) are arranged concentrically. 3. The microvibration suppressing device according to claim 1, wherein the first container (1) and the second container (2) are formed by bellows (11, 21). 4. An internal fluid (R) is an electrorheological fluid, and an orifice (33) through which the control means (3) allows the internal fluid to pass through, and an electrode arranged in the vicinity of the orifice for energizing the electrorheological fluid. (34A, 34B) is provided, The microvibration suppression apparatus of Claim 1, 2 or 3 characterized by the above-mentioned. 5. The microvibration suppressing device according to claim 4, wherein the electrodes (34A, 34B) are arranged in the vicinity of the orifice (33) so as to face each other in the vibration suppressing direction. 6. The gas chamber, which is deformed by the pressure of the internal fluid (R), is arranged inside the second container (2), as claimed in claim 1, 2, 3, 4 or 5. Micro vibration suppression device.