JPS6357984A - Earthquakeproof supporter - Google Patents

Abstract

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

Description

Detailed Description of the Invention (a) Purpose of the Invention [Field of Industrial Application] The present invention relates to equipment for nuclear power plants, thermal power plants, chemical plants, etc., support devices for piping, etc. $11 due to swelling etc! This relates to seismic support devices for equipment, piping, etc. that do not restrict sudden displacements, but act as restraints against sudden displacements caused by earthquakes, etc.

[Prior Art] Conventionally, as this type of seismic support device, an oil snubber shown in FIG. 2 and a mechanical snubber shown in FIG. 3 are known.

The oil snubber utilizes the movement of oil back and forth in the piston (movement via the orifice 14) when the piston 13 moves inside the cylinder 12 filled with oil 11. Since the movement of oil can also be followed, the resistance force is small. On the other hand, since the oil movement is restricted by the orifice, it cannot follow the sudden movement of the piston, and the oil in front of or over the piston is compressed, creating a large resistance force. Based on this principle, thermal displacement is not restrained, but sudden displacement due to earthquakes and the like is restrained.

A mechanical snubber converts the translational movement of a rod 21, one end of which is connected to equipment or piping, into the rotational movement of a flywheel 24 using a pole nut 22 and a ball screw 23. For slow movement, the flywheel also rotates. Although the resistance is small, a large resistance force is generated against sudden movement because the rotation of the flywheel is restrained by the resistance due to the rotational inertia of the flywheel itself and the action of the brake 25 that tightens the flywheel from the outer periphery.

In this way, conventionally used oil snubbers and mechanical snubbers do not restrain slow displacements, but are used as seismic support devices that restrain rapid displacements in various industrial fields including chemical plants.

However, in the oil snubber shown in Figure 2,
Sealing performance between piston rod 15 and cylinder 12 (
Although seals 16 such as O-rings are applied, there are problems with damage (deformation), deterioration, and radiation resistance of the seals), sliding properties between the piston and cylinder, and heat resistance of the oil. However, problems such as oil leakage, wear, adhesion, and damage occur, and as a result, periodic inspection and repair are required. Therefore, there is a problem of restrictions such as not being able to be installed in places that are difficult for workers to access (for example, places with high radiation levels) or places with high temperatures.

As described above, in the case of oil snubbers, especially in nuclear power plants, etc., the places where they can be used are limited, and the cost of periodic inspection and repair is required, which in turn causes radiation exposure to workers.

Mechanical snubbers were introduced to solve these problems, but although they did solve problems such as oil deterioration and oil leakage, they required complicated structures such as load transmission mechanisms, resulting in high costs. Furthermore, since lubricating oil was required for the sliding and rotating parts, there remained the problem of oil deterioration in a sense different from the former (oil snubber). Furthermore, when the temperature rises to high temperatures, an uneven rise in temperature occurs, and sticking of the sliding parts due to variations in thermal expansion of each part becomes a problem. As described above, even mechanical snubbers include many failure factors, and like oil snubbers, there is a problem in that the range of use (locations of use) is limited, although there are varying degrees of failure.

[Problems to be Solved by the Invention] This invention has been made in view of the above-mentioned circumstances. The object of the present invention is to provide an earthquake-resistant support device with a simple structure that eliminates problems such as wear and high cost, and requires almost no maintenance or inspection.

(B) Structure of the Invention [Means for Solving the Problem] In response to this objective, the seismic support device of the present invention includes a fixing plate with an orifice as a side fixed to a structure such as a building, and a fixing plate with an orifice. one bellows watertightly fixed to both sides of the fixing plate, and a closing member sealing the other open end of each bellows that is not on the fixing plate side;
and a liquid medium filled in the bellows, and one of the two closing members is connected to a supported body, such as equipment or piping, for seismic support.

Hereinafter, details of the present invention will be explained with reference to the drawings showing one embodiment.

FIG. 1 is a cross-sectional view of an earthquake-resistant support device according to an embodiment of the present invention. In the figure, 1 is a structure B such as 1lt1.
The fixing plate 1 is provided with an orifice 2 in the center.

Bellows 3 and 4 are watertightly attached to both sides (center of the front) of the fixed plate 1 with the orifice 2 in between. (In other words, the inside of the bellows 3 and the inside of the bellows 4 are in communication with each other via the orifice 2.) Reference numerals 5 and 6 are closing members, and the closing members 5 and 6 are the insides of the bellows 3 and 4. il release end, that is, the other end that is not on the fixed plate side, one of which (reference numeral 5 in the figure) is connected to a supported body (e.g., equipment) via a connecting member (e.g., rod) C. or piping)A
connected to. Reference numeral 7 is a liquid medium (working medium),
A liquid medium 7 (for example, silicone oil, etc.) is filled so that the entire area within the bellows is filled. Reference numeral 8 denotes a reinforcing ring. The reinforcing ring 8 is installed as necessary, and is installed in the valley of the bellows to increase the pressure resistance of the bellows.

The fixing plate, the bellows, and the closing member are generally made of metal plates, and the fixing plate and the closing member are preferably made of iron or stainless steel, and the bellows is preferably made of a thin stainless steel plate. In addition, although not shown, the vicinity of the tip of the support side bellows (bellows 3 in the figure) is suspended from the ceiling with a chain or the like so that the midpoint between the supported body A and the fixed plate 1 does not sag. You may. Alternatively, the closing member may be made larger than the outer diameter of the bellows, and a guide hole may be provided in that portion.
On the other hand, by attaching a guide rod parallel to the axis of the bellows to the fixed plate and letting this guide rod pass through the guide hole, it is also possible to support the bellows and the connecting member from sagging due to their own weight. In any case, since the scale of the support device (such as the size of the bellows) varies depending on the model to which the support device is applied, such prevention of downward jamming is not essential, but may be provided as needed.

[Operation] When a displacement that compresses the bellows occurs (that is, when the supported body is displaced toward the bellows side in the figure), the liquid medium in the bellows 3 passes through the orifice as shown by the arrow in the figure, and flows into the other bellows. It flows into the 4th side. At this time, the flow resistance caused by the orifice acts as a restraining force, so slow displacements due to thermal expansion etc. are not restrained, and sudden displacements due to earthquakes etc. cannot be followed by the throttling effect of the orifice, resulting in a large drag. , and restrains the displacement of the supported body.

In other words, the principle is the same as the conventional oil snubber, but
Sliding parts like oil snubbers (between piston and cylinder)
Since there are no seals or seals (between the rod and cylinder), sticking and oil leakage will not occur.

(c) Effect of the invention According to this invention, there is no sliding part at all, and therefore the layer 11
Since it is possible to obtain an earthquake-resistant support device with a simple structure and no oil seals, it not only reduces costs, but also requires almost no maintenance and inspection, so it is especially suitable for use in places with high radiation levels such as nuclear power plants, or in high-temperature areas. It can be installed anywhere in the environment, eliminating the problem of restrictions on installation locations, and reducing the problem of radiation exposure for workers, which has extremely beneficial effects industrially.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of an earthquake-resistant support device according to an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of an oil snubber that is a conventional earthquake-resistant support device, and FIG. 3 is a vertical cross-sectional view showing an example of a mechanical snubber. It is a front view. 1... Fixed plate 2... Orifice 3, 4...
・Bellows 5, 6...Closing member 7...Liquid medium A...Supported body B...Structure (building, etc.)
C...Connection member

Claims (1)

[Claims] A fixed plate having an orifice, a bellows watertightly fixed to both sides of the fixed plate across the orifice, a closing member sealing the other end of each of the bellows, and a liquid medium filled in the bellows. An earthquake-resistant support device characterized by comprising: