JPS6121667Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is designed to keep the displacement within an allowable range so that when piping in power plants, etc. undergoes slow displacement due to expansion and contraction due to temperature changes, the piping will not be destroyed due to excessive displacement. The purpose is to

Examples will be described with reference to the drawings. The tubular body 1 has a handle 1a at one end, is open at the other end, and has a stationary ring 1b fixed to the outer periphery near the open end. One end of the retractable rod 2 is inserted into the tubular body 1 so as to be freely removable, and a retractable ring 2a having the same diameter is fixed at an appropriate position in correspondence with the stationary ring 1b. Moreover, the other end constitutes another pull part. That is, the band 4 is connected via the mounting rod 3 fixed to the end of the entry/exit rod. Grip this band 4 and the pipe P. The stopper wheel 5 has the same diameter as the retractable wheel 2a, and the retractable rod 2 is located on the opposite side of the stationary wheel 1b with respect to the retractable wheel.
It is inserted into the outer periphery of the shaft so that it can be moved in and out in the axial direction. A plurality of bolts 6 are arranged at equal angles around the outer circumference of the entry/exit rod 2 and have a birdcage shape. That is, it passes through the removable ring 2a in a freely removable manner, one end is fixed to the stationary ring 1b, and the other end passes through the stopper ring 5 and is locked with a nut 7. The inlet/outlet ring can move between the stationary ring and the stopper ring, but this interval is to keep the displacement due to temperature changes of the pipe P within an allowable range, and to prevent the pipe from breaking due to excessive displacement. After moving, it can be restrained.

The present invention is constructed as described above. FIG. 2 shows an example in which the device R and the spring support device S are installed between the structure and the piping at important points in the piping P leading from the boiler B to the turbine T. It is possible to estimate to some extent the force applied to each important point during operation of the power plant and the direction of displacement caused by it, and by adjusting the distance between the stationary wheel and the stopper wheel and the mounting direction of this device accordingly. It can protect piping from destruction.

In piping systems that do not have this device, thermal stress causes excessive displacement of the pipe at certain locations beyond the permissible range, leading to pipe failure. Since this device restricts the displacement at that location within an allowable range, the stress is dispersed and spread to other locations, allowing the entire pipe to expand and contract in a balanced manner. It is obvious that this device also effectively acts on one-way reaction forces caused by safety valve release or piping defects.

As is typically found in nuclear power plants, critical piping requires numerous support devices to safely support it. However, not all of them need to be expensive damping devices. In particular, for piping that is not very important, such as small-diameter pipes, there are many places where it is possible to limit the displacement of the piping within a certain space even if it does not have a damping effect. For this reason, restraint devices are currently being developed that enclose the outer periphery of the piping at appropriate intervals. However, this device requires a considerable amount of space around the outer periphery of the piping due to its configuration, and is not necessarily inexpensive. In contrast, the present invention is a rod-shaped body that includes a birdcage-shaped entry and exit part. It is inexpensive and easy to install even in narrow spaces. A feature of the present invention is that it can be easily and generously installed in all required locations.

[Brief explanation of the drawing]

FIG. 1 is a front view of the present invention, and FIG. 2 is an explanatory diagram of the installed state. 1...tube body, 1a...handle, 1b...stationary ring,
2...Mounting rod, 2a...Mounting rod, 3...Mounting rod,
4... Band, 5... Stop ring, 6... Bolt, 7... Nut, P... Piping, B... Boiler,
T... Turbine, R... Restraint device, S
...Spring support device.

Claims (1)

[Scope of utility model registration request] A tube body is provided with a handle at one end, the other end is open, and a fixed ring is fixed to the outer periphery of the open end, and one end is inserted into the tube body so as to be able to move in and out of the tube body, and at an appropriate position, a retractable ring corresponding to the fixed ring is fixed. The other end is a take-out rod that forms another handle, and a stopper ring that is inserted into and out of the outer circumference of the take-out rod at a position opposite to the stationary ring relative to the take-in and take-out ring;
It is arranged at equal angles around the outer circumference of the entry/exit rod, passes through the entry/exit ring freely, and consists of a fixed ring and a bolt secured to the stopper ring at both ends, with one handle connected to the fixed body and the other handle connected to the piping. A movement-limiting restraint device.