JPH0626784Y2 - Vibration control device for piping - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a vibration damping device for piping, and more particularly to a vibration damping device for piping using a superplastic coil member and an elastic coil spring.

[Prior Art] Pipes of a nuclear power plant, a thermal power plant, a chemical plant, and the like are not only supported by a support, but also supported by a vibration damping device in order to protect the pipe from vibration such as an earthquake.

Heretofore, an elastic coil spring has been adopted in this vibration damping device in order to give a reaction force to the vibration displacement. This elastic coil spring shows a reaction force according to the force of vibration, and linear analysis for demonstrating the seismic resistance of piping is easy, and the analysis value approximately matches the relationship between actual vibration displacement and reaction force. Was there.

[Problems to be solved by the invention] By the way, in a vibration damping device employing this elastic coil spring, linear analysis is easy, but only a reaction force corresponding to the vibration force is exerted and vibration energy is positively applied. There is a problem that there is no action to absorb and attenuate it.

Therefore, in recent years, various vibration damping devices using a superplastic material instead of the elastic coil spring have been devised, but there is a problem that it is difficult to perform the linear analysis for demonstrating the above-mentioned seismic resistance of the pipe.

In view of the above-mentioned problems, the present invention has an object to provide a vibration damping device for piping, which can easily perform linear analysis for demonstrating seismic resistance of piping and positively dampen vibration. .

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a vibration damping device for a pipe that supports a pipe from a fixed side in order to damp vibrations such as an earthquake. The cylinder and the piston rod that slides inside are connected to each other, and when one of the superplastic coil member and the elastic coil spring undergoes compressive deformation in order to regulate the sliding amount between these cylinder and piston rod, the other undergoes tensile deformation. It is provided to receive.

[Operation] The superplastic coil member used in the present invention is made of a fine crystal grain superplastic alloy such as aluminum 78% -zinc 22%, and has a characteristic that stress depends on strain rate. That is, a large resistance force is exerted against a large deformation stress, but a low resistance force is exerted against a moderate deformation stress. Therefore, in the present invention, by using this superplastic coil member together with the conventional elastic coil spring as one member of the pipe support, a large resistance force is exerted through the elastic coil spring against the rapid deformation stress applied to the pipe due to an earthquake or the like. A good damping effect is exhibited, and this is allowed for gradual movement such as thermal expansion of piping.

The superplastic coil member draws a hysteresis loop to absorb and attenuate vibration energy, and the elastic coil spring imparts linearity to the hysteresis loop to facilitate linear analysis for demonstrating seismic resistance of piping. Is.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the vibration damping device for piping 1 connects the piping 2 and the fixed side 3. The main body of the vibration damping device 1 includes a cylinder 4 and a piston rod 5 that is inserted into the cylinder 4 and slides. The fixed side 3 is formed of a frame such as a steel frame, and the base of the cylinder 4 is fixed by welding or the like. Further, the tip end portion of the piston rod 5 is formed into a plate shape to form a bolt hole 6, and is clamped and bolted by a clamp 7 attached so as to cover the outer peripheral portion of the pipe 2. A long hole 8 is opened in the center of the cylinder 4, and a pin 9 standing upright on the piston rod 5 projects into the long hole 8. This pin 9
Is a guide ring 10 that slides on the outer peripheral portion of the cylinder 4.
It is penetrated and fixed to. As a result, the guide ring 10
Slides in a stroke corresponding to the length of the long hole 8, and the piston rod 5 slides in the cylinder 4 in the same stroke. Fixing rings 11 and 12 are screwed to both ends of the cylinder 4, respectively. And, between the fixed ring 11 and the guide ring 10 and between the fixed ring 12 and the guide ring 10,
Sliding amount between cylinder 4 and piston rod 5 (above-mentioned long hole 8
Coil springs 13 and 14 are provided to regulate the strokes determined by the above. These coil springs 1
3 and 14 are guide rings 10 and fixing rings 11 and 12.
It is connected and fixed to. The coil springs 13 and 14 have the cylinder 4 inserted therein so that the cylinder 4 functions as a guide for preventing the buckling of the coil springs 13 and 14. The lengths and strengths of the coil springs 13 and 14 are set so that the pin 9 and the guide ring 10 are located at the center of the stroke of the elongated hole 8 with the springs provided. Further, one of the coil springs 13 and 14 is formed of a superplastic coil member 15, and the other is formed of an elastic coil spring 16. In this embodiment, the pipe 2
The coil spring 13 on the side is formed by a superplastic coil member 15, and the coil spring 14 on the fixed side 3 is formed by an elastic coil spring 16. That is, the superplastic coil member 15 and the elastic coil spring 16 are provided such that when one of them is subjected to compressive deformation, the other is subjected to tensile deformation. This superplastic coil member 15 is, for example, aluminum 78% -zinc 2
It is made of a fine crystal grain superplastic alloy such as 2%, and has a characteristic that the stress depends on the strain rate. That is,
It exhibits a large resistance to large deformation stress, but exhibits a low resistance to moderate deformation stress. Therefore, by using this together with the elastic coil spring 16 provided on the pipe 2 side,
The elastic coil spring 16 exerts a good damping effect by exhibiting a large resistance force against a large deformation stress transmitted from the pipe 2 to the elastic coil spring 16 due to an earthquake or the like, and also allows the elastic coil spring 16 to gently move due to thermal expansion of the pipe 2 or the like. On the other hand, it slowly deforms to allow this.

Next, the operation of the above embodiment will be described.

The vibration damping device for piping 1 of the present invention comprises the above-mentioned superplastic coil member 15
And the elastic coil spring 16 are used in combination,
The superplastic coil member 15 and the elastic coil spring 16 connect the pipe 2 and the fixed side 3 to each other to the cylinder 4 described above.
In order to regulate the sliding amount (stroke defined by the elongated hole 8) between the piston rod 5 and the piston rod 5, when one is subjected to compression deformation, the other is subjected to tensile deformation. As a result, the superplastic coil member 15 and the elastic coil spring 16 receive the same weight, and a reaction force equivalent to that when they are provided in parallel is generated. As shown in FIG. 1, the superplastic coil member 15 and the elastic coil spring 16 are morphologically provided in series, but the pin 9 and the guide ring 10 for displacing them have a sliding amount. Since it is formed so as to be positioned at the center of the stroke of the elongated hole 8 to be determined, a reaction force equivalent to that when these are provided in parallel is generated.

The relationship between the displacement amount δ of the superplastic coil member 15 and the reaction force P corresponding thereto draws a hysteresis loop 17 as shown in FIG. 2 to positively absorb and attenuate the vibration energy. Further, the elastic coil spring 16 imparts linearity to the hysteresis loop 17 and facilitates the linear analysis for demonstrating the seismic resistance of the pipe described above. Therefore, if you want to increase the vibration damping effect,
If the superplastic coil member 15 is strongly set and the approximate value of the linear analysis is desired to be closer to the actual value, the elastic coil spring 16 is used.
Should be set strongly.

[Advantages of the Invention] In short, according to the present invention, it is possible to easily perform linear analysis for demonstrating the seismic resistance of piping and positively dampen vibrations.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the vibration damping device for piping of the present invention, and FIG. 2 is a graph showing the operation of the vibration damping device for piping of the present invention. In the figure, 1 is a vibration damping device for piping, 2 is piping, 3 is a fixed side, 4
Is a cylinder, 5 is a piston rod, 15 is a superplastic coil member, and 16 is an elastic coil spring.

Claims (1)

[Scope of utility model registration request] 1. A pipe vibration damping device for supporting a pipe from a fixed side in order to damp vibration such as an earthquake, wherein the pipe and the fixed side are connected by a cylinder and a piston rod that slides inside thereof. A vibration damping device for pipes, characterized in that a superplastic coil member and an elastic coil spring are provided so as to regulate the sliding amount between these cylinders and piston rods so that when one is subjected to compressive deformation, the other is subjected to tensile deformation. apparatus.