JPH03117744A - Damping device - Google Patents

Abstract

PURPOSE:To set a resonance frequency area in a specified region by installing a weight movably relatively to a damped body, arranging elastic bodies whose elastic coefficients are variable between the weight and the damped body so as to connect them to each other, and providing a member which adjusts pre- compression rate of the elastic bodies adjacent thereto. CONSTITUTION:When a pipe line P as a damped body oscillates, a weight 3 is relatively moved in an axial direction to expand and contract variable pitch springs 4, 5. The oscillations of the pipe line P are eliminated and suppressed by spring force and mass of the weight 3. The weight 3 compresses the supporting bar 2 through frictional members 6, 7 by the relative movement of the weight 3 and repeat frictional movement. Oscillation energy is therefore changed into heat, consumed, whereby the oscillation is attenuated. The position of a spring receiving flange 9 on the supporting bar 2 is changed in an axial direction by a nut 10. The spring constant is varied by varying pre-compression rate of the springs 4, 5. Then characteristic oscillation number, and further, resonance frequency area of the damping device is varied to correspond each frequency of the damped body.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vibration damping device that suppresses vibrations of a damped object such as piping in a power station or a plant using the principle of a dynamic damper.

(Prior Art) Conventionally, various vibration damping devices have been proposed to which the principle of an undamped constant frequency dynamic damper is applied.

However, everything has a certain natural frequency, and if it does not match the frequency of the vibration applied to the damped object, not only will there be no damping effect, but a resonance phenomenon will occur and the vibration will be excitation. This can also lead to problems. Therefore, the damper needs to have its natural frequency accurately set to a value that is valid for the frequency of the vibration in question. However, it is very difficult to design the damper in advance so that its natural frequency accurately matches the natural frequency of the damped object.

(Problems to be Solved by the Invention) Therefore, the present invention is a vibration damping device that suppresses the vibration of a damped object such as a pipe using the principle of a dynamic damper, and which changes its natural frequency to generate resonance. The objective is to provide something that allows the frequency range to be set to a desired range.

(Means for Solving the Problems) In the present invention, in order to solve the above problems, a weight 3°13.23 is attached to an object to be damped such as the pipe P so as to be relatively movable, and the weight 3, 13. Unequal pitch springs 4, 5, 14,
An elastic body capable of changing the elastic modulus, such as No. 15, 24, or 25, is interposed and adjacent thereto, a nut for adjusting the pre-compression screen of the elastic body to select the elastic modulus of the elastic body. A damping device was constructed by providing adjustment members such as Nos. 10, 20, and 30.

(Function) In the vibration damping device of the present invention, when it is applied to a damped object such as a constant vibration type piping P, NAND 10,
20. By adjusting the adjustment member such as 30, the precompression of the elastic body such as the uneven pitch spring 4, 5, 14, 15, 24° 25 is changed, and the resonant frequency range is adjusted to the frequency range of the damped object. Set it outside. Therefore, when a damped body such as the pipe P vibrates, the weights 3, 13, 23 move relative to this, causing the springs 4, 5, 14, 15, 24, 25 to expand and contract. Therefore, the vibration of the damped body is suppressed by this spring force and the mass of the weight. Also, P@rubbing member 616.26
In the case where side ♀ is attached, the friction members 6, 16° 26 come into direct or indirect frictional contact with the vibration damped body due to the relative movement of the weights 3, 13, 23. This frictional contact generates heat between the parts, which acts as a damper. Therefore, the vibration energy is converted into heat, consumed, and attenuated accordingly.

(Example) Examples of the present invention are shown in FIGS. 1 to 4. Fig. 1 is a front view of the vibration damping device, Fig. 2 is a principle diagram of the vibration damping device, Fig. 3 is a front view of a vibration damping device of another embodiment, and Fig. 4 is a front view of yet another embodiment. It is.

In FIG. 1, a gripping metal fitting 1 is fixed to a pipe P, which is an object to be damped, and a support rod 2 extends straight from the gripping metal fitting 1 in a direction perpendicular to the axis of the piping P. On this support rod 2, there is a weight 3 movable in the axial direction thereof, and uneven pitch springs 4 for holding this weight 3 in a predetermined original position and connecting it to the piping P. 5 is attached.

A friction member 6 for frictionally engaging the weight 3 with the support rod 2 is attached to the weight 3. The friction member 6 includes a friction shoe 7 and an adjustment bolt 8 for adjusting the friction force of the friction shoe 7 with respect to the support rod 2. The weight 3 and the springs 4 and 5 are held between a spring receiving collar 9 screwed onto the end of the support rod 2 and the side surface of the grip fitting 1.

The spring receiving collar 9 has a threaded portion 2 formed at the end of the support rod 2.
The position in the axial direction can be adjusted by a nut 10 that is fitted into the spring constant a and is a spring constant adjusting member.

In the vibration damping device of this embodiment, when the piping P, which is the object to be damped, vibrates, the weight 3 moves relatively on the support rod 2 in the axial direction, causing the springs 4 and 5 on both sides of the weight to expand and contract. let At this time, the vibration of the pipe P is absorbed and suppressed by the spring force and the quality of the weight.

Further, due to the relative movement of the weight 3, the weight is contracted upwardly on the support rod 2 via the friction member 6, and friction is repeated. This member 6, 7
Through repeated friction, vibration energy is converted into heat,
Since it is consumed, the vibration is damped by that amount.

By Natsu 10.

The axial position of the spring receiving collar q on the support rod 2 is changed to adjust the amount of precompression of the springs 4 and 5.

It is well known that by varying the amount of compression of an unequal pitch spring, its spring constant can be varied. As a result, the natural frequency of the damping device, and thus the resonant frequency range, can be changed to correspond to vibrations of various frequencies of the damped body. Note that the same effect can be obtained by using a conical coil spring as the spring or by replacing this with a conical rubber. In short, any elastic body whose elastic modulus can be changed by changing the amount of compression in advance may be used. Note that if vibration suppression based on the principle of a dynamic damper that can adjust the natural frequency is sufficient, the friction member 6 is not necessary.

FIG. 2 shows the principle of the vibration damping device.

FIG. 3 shows another embodiment of the invention. In this embodiment, the support rod 12 movably passes through the gripping fitting 11 and extends straight to both sides of the pipe P in the direction orthogonal to the axis thereof. The support rod 12 is provided with a pair of weights 13, 13 at both ends, and is positioned on both sides of the first gripping metal fitting 11, into which unequal pitch springs 14, 15 are fitted. Furthermore, a friction member 16 that frictionally engages with the support shaft 12 is attached to the gripping fitting 11 . The friction member 16 includes a friction shoe 17 and an adjustment bolt 18 for adjusting the friction force against the support rod 12.

19 is fixed to one end of the support rod 12, and one weight 1
20 is a nut screwed onto the threaded portion 12a at the other end of the support rod 12, and by adjusting the position of the other weight 13, the spring 14, 15
This is because it changes the amount of precompression, and thus its spring constant.

In this embodiment, due to the vibration of the pipe P, the weight 13
, 13, the support shaft 12 moves together with the spring 14.
, 15 expand and contract to suppress the vibration of the pipe P, as in the previous embodiment. Further, the gripping metal fitting 11 and the support shaft 12 are frictionally slid by the N friction member 16, and the vibration energy is converted into frictional heat and consumed, so that the vibration is attenuated by that amount.

FIG. 4 shows still another embodiment of the present invention.

This embodiment is for suppressing vibration in the axial direction of the pipe P, and is directly attached to the outer periphery of the pipe P. That is, on the outside of the heat insulating material A surrounding the pipe P, there are a pair of opposing spring receivers 1,521.22 spaced apart in the axial direction.
is fixed. The axial positions of the spring receivers r: J21, 22 can be changed by moving the nuts 30 on the outside thereof. In addition, these spring receiving collars 21,
22, and a weight 23 is fitted to the outside of the heat insulating material A so as to be relatively movable in the axial direction. 24 and 25 are interposed. A friction member 26 that frictionally engages with the heat insulating material A is attached to the weight 23. As in the previous embodiment, the friction member 26 includes a friction shoe 27 and an adjustment bolt 28 for adjusting the frictional force against the heat insulating material A.
It is equipped with

In this embodiment as well, the weight 23 moves due to the vibration in the axial direction of the pipe P, which causes the springs 24 and 2 to move.
5 expands and contracts, and as in the previous embodiment, the vibration of the pipe P is suppressed, and the heat insulating material A (substantially the pipe P) and the weight 23 slide by Jg via the friction member 26. Attenuates vibration energy.

Note that although the explanation here has been taken as an example of a vibration damping device that has a vibration energy damping function using a plastically deformed member,
If vibration suppression based on the dynamic damper principle is sufficient, the friction members 6, 16.2G are unnecessary and may be removed (not shown).

(Effects of the Invention) As described above, in the present invention, the weights 3, 13, 23 are attached to the object to be damped such as the pipe P so as to be relatively movable, and the weights 3, 13, 23 and the object to be controlled are An elastic body with a variable elastic coefficient, such as a conical coil spring, conical rubber, or uneven pitch spring, is provided between the vibrating body and the elastic body, such as a conical coil spring, a conical rubber, or an uneven pitch spring, to connect the two, and an elastic body is provided to adjust the amount of precompression of this elastic body. Since the damping device is configured with an adjustment member, the vibration of the damped object is absorbed and suppressed by the spring force and the mass of the weight, and the natural vibration of the damped object is adjusted to the frequency that should be avoided. Since the number can be set arbitrarily, it is possible to easily avoid resonance phenomena. Also.

A friction member G, 1 is placed between the weight 3, 13.23 and the damped body.
When 6.26 is additionally installed, at the same time, friction members 6.1G and 26 repeat frictional sliding, converting vibration energy into frictional heat, consuming it, and attenuating it, thus effectively damping the vibration. It has the effect of being able to do so.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; FIG. 1 is a front view of a vibration damping device, FIG. 2 is a principle diagram of the vibration damping device, and FIG. 3 is a front view of a vibration damping device of another embodiment. FIG. 4 is a front view of still another embodiment. ] Patent applicant Sanwa Tech Co., Ltd. Figure 1

Claims (5)

[Claims] (1) A weight is attached to the object to be damped so as to be relatively movable, a friction member is interposed between the weight and the object to be damped for frictional engagement between the two, and In a vibration damping device in which an elastic body is interposed between the damped body and the two to connect the two, the elastic body may be a variable elastic coefficient type such as a conical coil spring, a conical rubber, or an unequal pitch spring. What is claimed is: 1. A vibration damping device characterized by using an elastic body and having an adjustment member for adjusting the amount of precompression of the elastic body. (2) A support rod is attached to the gripping fitting that grips the piping that is the vibration-damped object, and a weight that is movable in the axial direction of the support rod is attached, and the weight and the vibration-damped object are connected to each other. In a vibration damping device equipped with an elastic body for connecting the elastic body, a variable elastic coefficient type such as a conical coil spring, a conical rubber, or an uneven pitch spring is used as the elastic body, and the elastic body is pre-compressed. A vibration damping device characterized by being provided with an adjustment member for adjusting the amount. (3) A support rod that extends straight in a direction perpendicular to the axis of the pipe is attached to the gripping metal fitting that grips the piping, which is the object to be damped, and a weight that is movable in the axial direction is mounted on the support rod. and an elastic body for connecting the weight and the vibration damped body, and a friction member that frictionally engages with the support rod is attached to the weight. A damping device characterized by using a variable elastic coefficient type body such as a conical coil spring, a conical rubber, or an uneven pitch spring as the body, and having an adjusting member for adjusting the amount of precompression of the elastic body. Device. (4) A weight is attached to both ends of a support shaft that movably passes through a gripping metal fitting that grips the piping that is the object to be damped, and a weight is attached between the weight and the gripping metal fitting. An elastic body is attached to connect the vibrating body, and the gripping metal fittings include:
In the vibration damping device in which a friction member that is frictionally engaged with the support shaft is attached, the elastic body is of a variable elastic coefficient type such as a conical coil spring, a conical rubber, or an uneven pitch spring, and the elastic body has a variable elastic coefficient. A vibration damping device comprising an adjustment member for adjusting an amount of precompression. (5) A pair of opposing elastic body receiving flanges are provided on the outer periphery of the piping, which is the object to be damped, at intervals in the axial direction, and a weight is provided between these spring receiving flanges so as to be movable in the axial direction. An elastic body for connecting a weight and the vibration-damped body is interposed between spring receiving flanges on both sides of the body, and a friction member that frictionally engages with the piping is attached to the weight. In the vibration damping device, a variable elastic coefficient type such as a conical coil spring, a conical rubber, or an uneven pitch spring is used as the elastic body, and an adjustment member is provided for adjusting the amount of precompression of the elastic body. A vibration damping device characterized by: