JPH0353503B2 - - Google Patents

Description

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

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 leaks due to wear and deterioration of the rubber sealing material, etc., and the mounting position is not constant, so a separate oil reservoir must be installed and its mounting position must be adjusted. 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. Case 1 has an elongated box shape, and supports S such as the floor of a building.
It is fixed horizontally on top. A cover 3 having an opening 2 is placed over the case 1. At the center of the bottom plate 4 of the case 1, a partition protrusion 5 is provided to protrude orthogonally to the longitudinal direction. A groove 6 is formed on the partition protrusion 5, into which a leaf spring 7 and a seal fitting 8 are fitted. The case 1 contains hydraulic oil 0 having an appropriate viscosity, such as silicone oil.

The sliding frame 9 has a box shape and is fitted face down inside the case 1 so as to be slidable in the longitudinal direction. A groove 10 is formed at the lower end of the side wall of the sliding frame 9, and a leaf spring 11 and a seal fitting 12 are fitted into the groove. The seal fitting 12 is slidably in close contact with the bottom surface of the case 1, and the seal fitting 8 of the partition protrusion 5 is also slidably in close contact with the bottom surface of the top plate 13 of the sliding frame 9.
The inside of the sliding frame 9 is divided into two pressure chambers 14 and 15 by the partition protrusion 5. Narrow hydraulic oil flow gaps 17, 17 serving as oil passages are formed between the inner surfaces of both side walls 16, 16 extending in the longitudinal direction of the sliding frame 9 and both side end surfaces of the partition protrusion 5. do.

Communication holes 1 are provided on both sides of the top plate 13 of the sliding frame 9.
8 and 19 are bored, and a check valve 2 is installed in each of these.
0 and 21 are provided. Check valve 20,2
1 opens when the sliding frame 9 moves and the working oil pressure in the pressure chambers 14, 15 drops below a certain value to suck in working oil outside the pressure chambers.

A bracket 22 is fixed on the top plate 13 of the sliding frame 9, and one end of a connecting member 23 connected to a supported body such as a piping system is pivotally supported at the upper end of the bracket 22. Further, a sliding cover 24 is fitted into the bracket 22 so as to be slidable over the cover 3 of the case 1.

Next, the effect will be explained. When the sliding frame 9 moves in the horizontal direction in conjunction with a supported body (not shown), the volume of one of the pressure chambers 14, 15 expands, and the volume of the other decreases. The hydraulic oil in the reduced pressure chambers 14, 15 moves to the other pressure chambers 15, 14 through the flow gaps 17, 17 between the partition protrusion 5 and the side walls 16, 16 of the sliding frame 9. do. However, since the hydraulic oil flow gap 17 is narrow, an orifice effect occurs, and the movement of the sliding frame 9 is suppressed due to the flow resistance of the hydraulic oil. This becomes the vibration damping force of the supported body. On the other hand, the hydraulic pressure in the expanding pressure chambers 14 and 15 decreases, and when this reaches a certain pressure or less, the check valves 20 and 21 open and the sliding frame 9
Suction external hydraulic oil 0 from communication holes 18 and 19,
Prepare for the next displacement of the supported body in the opposite direction. When the supported body is slowly displaced due to thermal expansion or the like, the hydraulic oil 0 in the pressure chambers 14, 15 can move back and forth across the flow gap 17 with almost no resistance, so this can be easily tolerated.

Note that the present invention is not limited to the illustrated embodiment; for example, the sliding frame 9 is not limited to a box-like shape as long as it can form two pressure chambers 14 and 15 together with the partition protrusion 5. , two pressure chambers 14,
The narrow oil passage communicating between the hydraulic oil flow gaps 17 and 15 is not limited to the hydraulic oil flow gaps 17, 17.

As explained above, the present invention provides support S
A box-shaped case 1 that is fixed horizontally to the housing, contains 0 hydraulic oil inside, has an opening 2 at the top, and has a partition protrusion 5 on the bottom plate 4 that is perpendicular to the longitudinal direction.
and the upper part is connected to the supported body, and it slides horizontally in the longitudinal direction in the hydraulic fluid 0 in the case 1 so as to form two pressure chambers 14 and 15 that are partitioned in the longitudinal direction by the partition protrusion 5 on the inside. The sliding frame 9 is freely fitted into the sliding frame 9, and the sliding frame is configured to open when the hydraulic pressure in the two pressure chambers 14, 15 becomes below a certain value, and suck in hydraulic oil 0 into each pressure chamber 14, 15. 9, and the two pressure chambers 14, 15 are communicated with each other by narrow oil passages 17, 17 that create appropriate flow resistance. Therefore, it can be installed stably,
Since zero hydraulic oil is contained in the box-shaped case 1, there is no fear of oil leakage, the overall structure is simple and robust, and it has the effect of being inexpensive.

[Brief explanation of drawings]

1 is a longitudinal sectional front view, FIG. 2 is a sectional view taken from FIG. 1, and FIG. 3 is a sectional view taken from FIG. 1. 1... Case, 2... Opening, 4... Bottom plate, 5... Partition protrusion, 9... Sliding frame, 14, 15... Pressure chamber, 17... Distribution gap (oil passage), 20, 21... Check valve, 0
…hydraulic oil.

Claims (1)

[Scope of Claims] 1. A box-shaped case that is horizontally fixed to a support, contains hydraulic oil inside, has an opening at the top, and has a partition protrusion perpendicular to the longitudinal direction on the bottom plate; A sliding member whose upper part is connected to the supported body and which is fitted into the hydraulic oil in the case so as to be slidable horizontally in the longitudinal direction so as to form two pressure chambers partitioned in the longitudinal direction by the partition protrusion on the inner side. a frame; and two check valves provided on the sliding frame so as to open and suck hydraulic oil into each pressure chamber when the hydraulic pressure in the two pressure chambers falls below a certain value, A stationary hydraulic vibration isolator characterized in that the chambers are communicated with each other by a narrow oil passage that generates appropriate flow resistance.