JPS58121390A - Vibration-proof device for vertical pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration isolator for vertically arranged pipes (vertical pipes), and more specifically to vibration isolators for vibrations caused by the flow of fluid in pipes, or vibrations caused by seismic vibrations in piping systems. This invention relates to a vibration isolator for vertical pipes used for dispersing vibration stress generated in vertical pipes.

Conventional piping vibration isolators (Suaverace) include ■spring type vibration isolators and ■hydraulic type vibration isolators, but ■ has a relatively simple structure and can easily adjust the natural frequency of the entire piping system. Although it has the advantage of being able to avoid resonance vibration caused by external disturbances by raising the temperature, it also has the disadvantage of restricting expansion and contraction due to thermal expansion of the piping.
Alternatively, large-capacity springs have drawbacks such as restrictions due to spring manufacturing. In addition, ■ can reduce resonant vibration well, can freely follow the expansion and contraction of piping with almost no restraint, and can be manufactured with large capacity relatively freely. On the other hand, the response to minute vibration amplitudes or high frequency vibrations is poor and the effectiveness cannot be expected, and the sealing material is constantly subject to internal stress, making it easy for the sealing material to break. There are drawbacks.

Furthermore, since these vibration isolators support the weight of the piping at the same time, it takes time and effort to adjust the load, and installation is inconvenient.

In view of the above circumstances, the present invention intervenes in the gap between two surfaces;
By focusing on the vibration absorption effect of viscous shear resistance caused by the relative motion between two surfaces of a viscous body, the present invention provides a novel vibration isolating device for vertical pipes that eliminates the drawbacks of the above-mentioned prior art. For this reason, the vibration isolating device takes the following tactical measures. ■It consists of a flat movable plate, a movable box that accommodates the movable plate, and a fixed box with a bottom that accommodates the movable box.■The movable plate is attached in conjunction with the vertical pipe, and is The movable box can be moved in the direction of the plate surface (two axes) within the movable box, and is housed in ζ, and the movable box can be moved in the direction perpendicular to the surface of the movable plate (in the other one axis direction) within the fixed box via a spacer. (As a result, the movable plate and the movable box are movable in three axial directions), and the gap formed by the spacer is filled with viscous fluid. A vibration isolator for vertical pipes that uses resistance.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

1 to 4 show one embodiment (first embodiment) of the vibration isolator S of the present invention, and its outline is shown in the exploded perspective view of FIG. Here, P is a pipe arranged vertically (hereinafter referred to as a vertical pipe), a lip R is fixedly stretched on the vertical pipe P, and a plate R' is attached to the lip. A is a bolt through hole drilled in the plate R' for attachment. Incidentally, the reference numeral ``■'' indicates a bolt that is inserted into the bolt through hole, and is tightened with a nut (not shown) or the like.

I is a flat movable plate, and the movable plate is attached to the plate 11.
The attachment of lip R is fixed to plate R' via. lla is a bolt through hole or screw hole drilled in the plate 11 for attachment. The movable plate 1 is sufficiently thick and rigid enough not to bend even if a force perpendicular to the plate surface 1a is applied.

Reference numeral 2 denotes a rectangular parallelepiped movable box, which is open at the top and bottom, and the movable plate 1 is accommodated through the interior space.

Reference numeral 3 denotes a fixed box with a bottom, which is open at the top and accommodates the movable box 2. #The fixed box 3 itself has a bottom, or the bottom plate 31 is fixed to the lower part of the bottomless rectangular fixed box to form the bottom. 031a is bored in the bottom plate 31. This is a bolt through hole and is used for attachment to the frame G.

The characteristic configuration of the present invention embodied in this embodiment is the assembly and arrangement relationship between the movable plate 1, the movable box 2, and the fixed box 3, the details of which are shown in FIGS. 2 and 3. . That is, a plurality of spacers 41 are embedded in the movable plate 1 so as to protrude from the flat plate surface 1a. The spacer 41 is in sliding contact with the inner surface of the movable box 2, is made of a material that does not wear easily (usually metal, preferably high-strength brass), and has a protrusion amount of 0.5 to IW from the flat plate surface 1a of the movable plate 1. Therefore, the movable plate 1 is set in the vertical direction (first
Since the upper and lower parts of the movable box 2 are open in the X-axis direction (Fig. This allows you to move freely. Since the movable plate 1 is disposed on the inner surface of the movable box 2 via the spacer 41 in the lateral direction (in the axial direction of FIG. 1, 2), the movable plate 1
It is movable in the direction indicated by a (X-Y axis direction, hereinafter referred to as the "plate surface direction" of the movable plate).

In addition, a plurality of spacers 42 are embedded in the front and rear outer surfaces 2a of the movable box 2, protruding from the outer surfaces 2a! ,! There are 1. The spacer 42 is in sliding contact with the front and rear inner surfaces of the fixing box 3,
Its material and protrusion amount are the same as those of the spacer 41. and,
The fixed box 3 has stopper members 5 that slidably sandwich the upper and lower parts of the movable box 2 at the top and bottom of the front and rear inner surfaces of the side that slides into contact with the movable box 2.
(Figure 3). Therefore, the movable box 2 is clamped to the fixed box 3 via the surface 42 in the front-rear direction, and fixed to the fixed box 3 via the stopper member 5 in the vertical direction. cannot move in the direction
However, since there is a movement space B in the lateral direction, the movable box 2 is movable only in the lateral direction (hereinafter referred to as the "direction perpendicular to the plate surface" of the movable plate).

As a result, the movable plate 1 and the movable box 2 are aligned with respect to the fixed box 3 (or other stationary system) in three axes (X, Y.

It is movable in the Z-axis direction.

K Then, by assembling and installing the movable plate 1 into the movable box 2 and the movable box 2 into the fixed box 3, a gap 6 corresponding to the amount of protrusion of the spacers 41 and 42 is created between the respective sliding contact members. It turns out.

Reference numeral 7 denotes a viscous fluid injected into the fixing box 3, which fills the above-mentioned gap 6. The viscous fluid 7 is not only a normal viscous body, but also a high viscosity viscous body, such as a polymeric viscous body such as polyisobutylene, polypropylene, polybutene, dimethylpolysiloxane, or asphalt, in order to improve the damping characteristics described later. is used.

The installation of the vibration isolator S according to this embodiment of the invention is carried out as follows. The rib R having the plate R' is fixed at a predetermined position on the vertical pipe P by welding or the like.

Further, a pedestal G is provided around the vertical pipe P, the present vibration isolator S is interposed between the pedestal G and the rib R, and the fixing box 3 is attached to the pedestal G by bolts through the bolt holes 31a of the support plate 31. It can be attached or fixed by direct bath contact. After that, the movable plate 1 inserted into the movable box 2 is pulled up a little, and the plate 11 for attaching the movable plate is brought into contact with the plate R' for attaching the rib R, and the bolt through hole R' is brought into contact with the plate R'. a
+ 11 After aligning the parts a, fix them with bolts and nuts, or fix them both by welding.〇This installation work is easy to perform, and
It has the following advantages. During the installation work, even if there is a slight deviation in the horizontal direction between the installation positions of the frame G and the rib R, the movement area B1 between the fixed box 3 and the movable box 2 and the movement area A between the movable box 2 and the fixed plate 1 will be maintained. In addition, the displacement in the vertical direction is also absorbed by moving the movable plate 1 in and out of the movable box 2 up and down, and the position is adjusted. In addition, at the end of the installation,
In order to prevent dust from getting into the viscous fluid 7 in the fixed box 3 of this device S, the movable plate 1 is attached to the plate 11 (or the rib is attached to the plate) and the upper edge of the fixed box 3. A dustproof cover can also be attached.

The installation mode of the device S of the present invention is that it can be installed independently on the vertical pipe P, or it can be installed on the same pedestal G in combination with another support device (i.e. support Q). Alternatively, it is also possible to use a combination thereof as appropriate (see FIG. 4). Therefore, the response of the vibration isolator S of the present invention embodied in the first embodiment to the displacement (vibration and movement) of the vertical pipe P Regarding this, even if the vertical pipe P is displaced in either direction of the pipe axis or the direction perpendicular to the pipe axis (radial), the device S can be moved in three axial directions, and this displacement is caused by the spacers 41 and 42. This occurs as a relative movement between the two surfaces in the gap 6 with . ) However, since the gap 6 is filled with the viscous fluid 7, viscous shear resistance acts here. In other words, the resistance force due to viscous shear is generally proportional to the viscosity coefficient of the viscous body, the area of the two surfaces that move relative to each other through the viscous body, and their relative speed, and inversely proportional to the gap distance between the two surfaces. In accordance with these specifications of the device S, a resistance force acts in a direction to stop the movement of the movable box 2 and the moving board, as well as the vertical pipe P linked thereto. However, the gap 6
Since the distance is extremely small and the relative area of the plate surfaces is large, the resistance force acting between the two surfaces is extremely large and immediately stops the movement of the vertical pipe P.

When a high-viscosity polymeric viscous material is used as the viscous fluid 7, this tendency becomes even more remarkable. A phenomenon in which the viscosity changes from high viscosity to low viscosity, making it easier to flow, and the degree of increase in resistance force υIJ decreases.Distance force is approximately proportional to the speed to the 0.5 to 0.6 power.)
The generation of the resistance force is constant regardless of the displacement amplitude and vibration frequency as long as the speed is the same, and when a constant speed is given, the resistance force shows a rise like a rectangular wave, so it is extremely resistant to vibrations. It is sensitive and has excellent quick response. As a result, the kinetic energy of the vertical pipe P is quickly absorbed, and harmful stress caused by vibration is not generated in each component of the vibration isolator S.

Other embodiments of the present invention (second embodiment) are shown in FIGS. 5 and 6.
0 indicates members having the same functions as those in the first embodiment are given the same reference numerals.

The feature of the configuration that is different from that of the first embodiment is that the movable box 2
The movable box 2 is placed on the inner bottom surface of the fixed box 3, with a bottom 21 having a flat plate shape and a spacer 42 buried in the lower surface 211 of the bottom 21. In addition, the side surface 2 of the bottom portion 210 in the front-rear direction (Y direction)
12 is formed on a sliding surface and is restrained by the inner surface formed on the sliding surface of the fixed box 3, so that only sliding is possible. Furthermore, the lateral (two-direction) side surfaces 2 of the bottom portion 21
Reference numeral 13 has a moving area B and is disposed opposite to the inner surface of the fixed box 3.

Therefore, the movable box 2 and the fixed box 3 are connected to the lower surface 21 of the movable box.
1 and the inner bottom surface of the fixing box 3 are installed so that they can move relative to each other only in the lateral direction (Z direction) with a gap 6 equal to the protrusion amount of the spacer 42 between them.

Further, since the viscous fluid 7 is separately filled into the movable box 2 and the fixed box 3, the amount of viscous fluid can be smaller than that in the first embodiment.

The present invention is not limited to the configurations of the above two embodiments, and various design changes can be made within the scope of the basic technical idea of the present invention. That is, ■ The arrangement of the movable plate 1, movable box 2, and fixed box 3 does not require that the movable plate 1 coincides with the radial direction of the vertical pipe P, and can be set at any position as long as it is vertical. The device S can be installed in any direction since it can move in three axial directions in cooperation with each other.

0 In addition, the spacers 41 and 42 may be embedded in a manner other than the embodiments described above, for example, the spacer 41 is embedded in the inner surface of the movable box 2, or the spacer 42 is embedded in the inner bottom surface of the fixed box 3. The point is that the spacers 41 and 42 allow the movable plate 1, the movable box 2, and the fixed box 3 to be
Any material may be used as long as it maintains a suitable gap on the viscous resistance surface.

Since the vertical pipe vibration isolating device of the present invention has an oblique configuration and function, it has the following various superior effects compared to conventional devices. Although it can be manufactured economically and has a simple structure, it exhibits an excellent vibration damping function.

■ The movement of this device is not restricted to only one direction, but can be moved in any direction, allowing for greater flexibility in piping design. ■ The vibration displacement transmitted to this device is due to the good speed-resistance characteristics of viscous fluid. It is absorbed smoothly and the displacement stops immediately. In particular, since even minute vibrations are absorbed quickly, the response value can be reduced even if the vibrations match the natural vibrations of the piping system (resonant vibrations).

(2) Resistance due to viscous shear resistance does not increase the pressure inside the viscous fluid (therefore, there is no need for a seal mechanism required in conventional oil dampers, and there is no reduction in performance due to damage to the seal.

■ Slow changes in expansion and contraction due to thermal expansion of the vertical pipe can be absorbed by the moving region, and the expansion and contraction of the vertical pipe can be freely followed.

■ When installing books and equipment, it is possible to adjust the position horizontally and vertically, making the installation work easy.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show a vibration isolator for vertical pipes according to the present invention, and FIG. 1 is an exploded perspective view of one embodiment of the device, FIGS. FIG. 4 is a usage example diagram, and FIGS. 5 and 6 are main part sectional views of other embodiments. S... Vibration isolator, 1... Movable plate, 1a
...Movable plate, 2...Movable box, 3...
...Fixing box, 41.42...Spacer, 6...
... Gap, 7... Viscous fluid, 8...
...Vertical pipe. Patent applicant: JGC Oiles Industry Co., Ltd., agent: Gen 1) Hitoshi Figure 7 10 Figure 5

Claims (1)

[Claims] L: A flat movable plate (1), a movable box (2) that accommodates the movable plate (1), and a fixed box (3) with a bottom that accommodates the movable box (2). The movable plate (1) is attached in conjunction with the vertical pipe e), and is housed in the movable box (2) via a spacer (41) so as to be movable in the direction of the plate surface (1a), The movable box (2) is connected to the fixed box (2) via a spacer (42).
3) is accommodated in the movable plate (1) so as to be movable in the direction perpendicular to the plate surface (1a) of the movable plate (1), and is formed by the spacers (41, 42).
A vertical pipe vibration isolator [F])02, characterized in that the spacer (41, 42) is made of high-strength brass, characterized in that the spacer (41, 42) is made of high-strength brass. Vibration isolator for the vertical pipe described. 3. The vibration isolator for a vertical pipe according to claim 1 or 2, wherein the spacer (41) is fixed to the plate surface (1a) of the movable plate (1). 4. The spacer (42) is attached to the outer surface (2a) of the movable box (2)
or the vibration isolating device according to claim 1 or 2, which is fixed to the bottom surface 211. Claims 1 to 4, wherein the viscous fluid (7) is a highly viscous body. Vibration isolating device for vertical pipes as described in any of paragraphs.