JPH0412294Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This is a spring-type vibration suppressor that protects long pipes used in plants, power stations, etc. from vibration, and eliminates the need for on-site welding work during installation. The purpose is to

[Prior Art] A known technique will be described with reference to FIG. Outer tube 51
is provided with flanges 51a at both ends, and has a diametrically long hole 51b bored in the center in the axial direction. One end of the locking tube 52 is slidably inserted into the outer tube, and the other end serves as a locking end. The inner tube 53 is slidably inserted into the other end of the outer tube, and the outer end is a locking end. Further, a pin 54 that protrudes through the elongated hole 51b is fixed to the inner end, and a spring bearing ring 55 is locked to the outer end of the pin. A spring 56 is inserted between the spring receiving ring and the collar.

This device is installed on piping in operation, that is, on hot pipes. First, both retaining ends are secured to the structure and piping, respectively. The outer tube moves in and out of the retaining tube, and the distance between the two retaining ends can be adjusted freely. Next, the retaining tube is welded to the outer tube to obtain the state shown in FIG. 3. Only by welding can damping function be achieved.

During this time, the spring bearing ring is located at the center of the elongated hole from beginning to end, and the piping is not affected by the spring in the hot state.
Therefore, the vibration of the piping is damped equally in both forward and reverse directions. When the piping becomes cold, the piping becomes deflected, the balance of spring force is broken, and one-way pressure is constantly applied to the piping. This is not good for piping. However, in general, piping is normally operated continuously 24 hours a day, and cold conditions are only used during periodic inspections, so this is not a major problem.

[Problem to be solved] To perform installation work on hot piping,
There are many other difficulties such as securing footholds, but pipe vibrations during operation make welding work extremely difficult.
Installation work without welding has been long-awaited.

[Solution] Advances in piping technology have made it possible to calculate the deviation length between a cold pipe and a hot pipe quite accurately using diagram calculations. Based on this progress, the installation work was carried out on cold pipes, and when the temperature change of the pipe progresses and reaches a certain level, the sliding inner and outer pipes will automatically lock. We decided to provide a pair of scissors that can be fitted together.

[Example] Fig. 1 will be described. The outer tube 1 has flanges 1a on both ends.
A long hole 1b is provided in the axial direction on the diameter line. One end of the retaining tube 2 is fixed to the outer tube end, and the other end forms a retaining end 2a. The inner tube 3 is slidably inserted into the outer tube, a pin 4 passing through the long hole 1b is fixed to the inner end, and a pair of symmetrical notch windows 3a are provided in the center.
is open.

The spring bearing ring 5 is slidably inserted into the outer tube and the pin 4
is locked. A pair of springs 6 are inserted into the tube with the collar 1a on both sides of the spring bearing ring. The scissor ring 7 consists of a pair of semicircular clamps hinged at one end, biased toward closure by an attached spring 8, and fitted into the cutout window 3a. The retaining tube 9 is slidably inserted into the open end of the inner tube, has an annular groove 9a in its center that can be engaged with a scissor ring, and has an outer end as a retaining end 9b. This device is used by locking one of the locking ends to the bracket B of the structure and the other to the pipe clamp C.

This device is installed on cold pipes. FIG. 1 shows the state at that time. It is assumed that the piping deviates to the right in the figure by a length L due to temperature rise. The number L is calculated in advance. Annular groove 9
The length L is set between a and the scissor ring 7. Therefore, when the pipe P rises to a predetermined temperature, the annular groove and the scissors engage, and the inner pipe and the stopper pipe 9
is locked.

[Effect] Can be installed on cold pipes without welding. In a hot tube, the left and right spring pressures are balanced, providing the most effective damping effect against vibrations.

[Brief explanation of the drawing]

FIG. 1 is a front view of the damper, FIG. 2 is a side view of the scissors, and FIG. 3 is a front view of a known damper. 1... Outer pipe, 1a... Tsuba, 1b... Long hole, 2...
...Retaining pipe, 3...Inner pipe, 3a...Notch window, 4...
Pin, 5... Spring bearing ring, 6... Spring, 7... Scissor ring, 8... Spring, 9... Stop tube, 9a... Annular groove, B... Bracket, C... Clamp, P... …
Piping, 51... Outer pipe, 51a... Tsuba, 51b...
Long hole, 52... Retaining pipe, 53... Inner pipe, 54...
Pin, 55...spring bearing ring, 56...spring.

Claims (1)

[Scope of utility model registration request] An outer tube with flanges at both ends and a diametrically elongated hole in the axial direction, a locking tube with one end fixed to the outer tube end and the other end as a locking end, and an inner tube that is slidably inserted into the outer tube. an inner tube having a pin passing through the elongated hole fixed to its end and having a pair of symmetrical notched windows in the central part; a spring bearing ring slidably inserted into the outer tube and locked to the pin; and an outer tube. It consists of a pair of springs inserted between the collar of the pipe and the spring bearing ring, and a pair of semicircular clamp pieces with one end hinged, and the clamp is biased to close by an attached spring and fitted into the cutout window. It consists of a scissor ring and another locking tube that is slidably inserted into the open end of the inner tube, has an annular groove in the center that can be engaged with the scissor ring, and has a locking end at the outer end. A spring-type vibration damper in which one end of the toe is secured to the object to be damped and the other end is secured to the structure.