JPH0353504B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a power plant, a chemical plant, etc.
The present invention relates to a stationary hydraulic vibration isolator that supports a supported object such as a piping system from vibrations caused by an earthquake or the like in a vibration-isolating manner on a support such as the floor of a building.

Conventionally, it is used as a vibration isolator that allows slow displacement due to thermal expansion of supported objects such as piping systems without difficulty, and restrains high-acceleration displacement due to earthquakes etc. to suppress vibration amplification. , hydraulic vibration isolators using hydraulic resistance and mechanical vibration isolators using inertial resistance are known. However, the former requires frequent maintenance and inspection to prevent oil leakage due to wear and deterioration of the sealing material, and the installation position is not constant, so it is necessary to install a separate oil reservoir and adjust its mounting position. In addition, the latter has a relatively complicated mechanism and requires precision machining of parts, making it expensive.

The present invention has been made in view of the above-mentioned problems, and aims to provide a hydraulic vibration isolator at a low cost as a fixed type with a simple structure and robustness, and to eliminate the need for oil leakage countermeasures after installation. .

Embodiments of the invention will be described below with reference to the figures. The oil case 1 is fixed horizontally on a support S such as the floor of a building. A cover 3 having an opening 2 is mounted on the oil case 1. Further, the oil case 1 contains hydraulic oil 0 such as silicone oil.

The cylinder 4 is housed in hydraulic oil 0 within the oil case 1 so as to be horizontally movable. A partition wall 5 that divides the inside of the cylinder 4 into two is provided in the center of the cylinder 4, and a pair of air vent holes 6, 6 are provided in the upper part of the cylinder wall on both sides of the partition wall. These air vent holes 6, 6 are normally plugged with plug 7, respectively.
It is blocked by 7. However, cylinder 4 is
It is supported by a holder 8 having a bracket 9 projecting from the oil case 1 at the top thereof, and is connected to a supported body such as a piping system via a connecting member 10 whose one end is pivotally supported by the bracket 9.

The piston bodies 11 and 12 are provided so as to protrude oppositely from each other inside the longitudinal side walls 1a and 1b of the oil case 1, and their inner sides are slidably inserted into both sides of the cylinder 4, respectively. Two oil chambers 13 and 1 are formed on both sides of the partition plate 5 inside the cylinder 4 by the piston bodies 11 and 12.
4 is formed. Each piston body 11, 12 is provided with oil passages 15, 16 which communicate the oil chambers 13, 14 with the outside.
7 and 18 are attached. Check valve 17, 18
When the hydraulic oil 0 that is about to flow out from each oil chamber 13, 14 reaches a predetermined speed or higher, it is pushed by this and closes the oil passages 15, 16.

The sliding cover 19 is fitted into the bracket 9 and placed on the cover 3, and is slidable.

Next, the effect will be explained. When the cylinder 4 moves in the horizontal direction in conjunction with a supported body (not shown), one of the oil chambers 13 and 14 expands, and the other contracts. The oil in the reduced oil chambers 13 and 14 tries to flow into the case 1 through the oil passages 17 and 18, but if the cylinder 4 moves rapidly,
The check valves 17 and 18 are closed by hydraulic pressure, and the cylinder 4 is closed.
prevent relative movement of This becomes the vibration damping force of the supported body. On the other hand, oil in the case 1 is sucked into the expanding oil chambers 14 and 13 through oil passages 18 and 17 without resistance. When the supported body is slowly displaced due to thermal expansion or the like, the cylinder 4 slowly moves relatively. Therefore, the oil in the oil chambers 13, 14 is discharged from the oil passages 15, 16 without closing the check valves 17, 18. Therefore, slow displacement of the supported body is allowed without difficulty.

The air vent hole 6 is used to vent air from the oil chambers 13 and 14 when hydraulic oil 0 is introduced into the case 1 incorporating the cylinder and piston body.

As explained above, the present invention provides support S
an oil case 1 which is fixed horizontally to the container, contains 0 hydraulic oil inside, and has an opening at the top; the top is connected to a supported body;
A cylinder 4 is housed in the hydraulic oil 0 in the oil case 1 so as to be horizontally movable in the axial direction, and a cylinder 4 protrudes inward from opposite side walls 1a and 1b of the oil case 1, respectively.
Oil passages that are slidably inserted into both sides of the cylinder 4, form two oil chambers 13 and 14 on both sides of the partition wall 5, and communicate the oil chambers 13 and 14, respectively, with hydraulic oil 0 outside the cylinder 4. 15, 16 and each oil passage 1
Check valves 17 and 18 are interposed between the oil passages 15 and 16 to detect the rapid flow of hydraulic oil and close the respective oil passages 15 and 16.
A pair of opposing fixed piston bodies 11 and 12 having
Because it has a structure that includes these, it can be stably installed on the support S, there is no risk of oil leakage because 0 hydraulic oil is contained in the oil case 1, and the overall structure is simple and robust. It has the effect of being obtained at low cost.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view, and FIG. 2 is a sectional view of FIG. 1. 1...Oil case, 2...Opening, 4...Cylinder, 5...
Partition wall, 11, 12... Piston body, 13, 14...
Oil chamber, 15, 16... Oil passage, 17, 18... Check valve, S... Support body.

Claims (1)

[Scope of Claims] 1. An oil case horizontally fixed to a support body, containing hydraulic oil inside and having an opening at the top; and a cylindrical oil case connected to the supported body at the top and having a partition wall in the middle. and a cylinder housed in the hydraulic oil in the oil case so as to be horizontally movable in an axial direction; Two oil chambers are formed on both sides of the partition wall, and an oil passage that communicates the oil chamber with the hydraulic oil outside the cylinder, and an oil passage that is interposed between each oil passage and detects the rapid flow of hydraulic oil and separates each oil passage. A stationary hydraulic vibration isolator comprising a pair of opposing fixed piston bodies having a check valve that closes the piston body.