Hydraulic vibration isolation device and supporting structure for structure

Abstract

To provide a hydraulic vibration isolation device and a supporting structure for a structure that make a device smaller.SOLUTION: A hydraulic vibration isolation device comprises: a cylinder having a hollow shape, and internally filled with oil; a piston movable inside the cylinder, and partitioning two hydraulic chambers; a rod of which one end part is connected to the piston, and of which the other end part protrudes to the outside of the cylinder; a communication passage for establishing communication between the two hydraulic chambers; and a biasing member for biasing the piston in a direction in which a tip part of the rod comes into contact with a structure and presses it.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a hydraulic vibration isolation device and a support structure for a structure. [Background technology]

[0002] In a nuclear power plant, a nuclear reactor and a steam generator are housed inside a reactor containment vessel. Equipment such as the steam generator is supported by support devices on the walls of the room at multiple positions in the vertical direction. These support structures use hydraulic vibration isolators (also called snubbers), which follow but do not restrain slow displacements such as thermal expansion displacement, and do not follow but restrain fast displacements such as seismic displacement. An example of a conventional hydraulic vibration isolator is described in Patent Document 1 below. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-246207 Summary of the Invention [Problem to be solved by the invention]

[0004] In a conventional hydraulic vibration isolator, one longitudinal end is connected to a wall of a room, and the other end is connected to a structure such as a steam generator. The steam generator or other equipment is placed in a room of a predetermined size, with a space between it and the wall. The support device is placed in a narrow space between the wall of the room and the steam generator. Therefore, from the standpoint of rationality, it is desirable to reduce the size of the support device.

[0005] The present disclosure is devised to solve the above-mentioned problems, and aims to provide a hydraulic vibration isolation device and a support structure for a structure that allows for the miniaturization of the device. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the hydraulic vibration damping device of the present disclosure comprises a hollow cylinder filled with oil, a piston that is movable inside the cylinder and separates two hydraulic chambers, a rod having one end connected to the piston and the other end protruding outside the cylinder, a communication passage that connects the two hydraulic chambers, and a biasing member that biases the piston in a direction in which the tip of the rod contacts and presses against a structure.

[0007] In addition, the support structure for a structure disclosed herein is a support structure for a structure that is arranged adjacent to a wall portion, and the hydraulic vibration isolation device has the cylinder connected to the wall portion and the other end of the rod pressing against the structure. [Effects of the Invention]

[0008] According to the hydraulic vibration isolation device and support structure for a structure disclosed herein, the device can be made smaller. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic front view showing a support structure for a structure using a hydraulic vibration isolation device according to this embodiment. [Figure 2] FIG. 2 is a schematic plan view showing a support structure for a structure using a hydraulic vibration isolation device. [Figure 3] FIG. 3 is a cross-sectional view showing the hydraulic vibration isolation device of this embodiment. [Figure 4] FIG. 4 is a cross-sectional view of a main part showing a modification of the hydraulic vibration damping device of this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Preferred embodiments of the present disclosure will be described in detail below with reference to the drawings. Note that the present disclosure is not limited to these embodiments, and when there are multiple embodiments, the present disclosure also includes configurations that combine the embodiments. Furthermore, the components in the embodiments include those that can be easily imagined by a person skilled in the art, those that are substantially identical, and those that are within the so-called equivalent range.

[0011] <Support structure of the structure> FIG. 1 is a schematic front view showing a structure supporting structure using a hydraulic vibration isolation device according to this embodiment, and FIG. 2 is a schematic plan view showing a structure supporting structure using a hydraulic vibration isolation device.

[0012] As shown in Figures 1 and 2, this embodiment will be described by applying a steam generator 100 as the structure. Note that a ring frame, which will be described later and which accompanies the steam generator 100, is also included in the structure. The hydraulic vibration isolation device 10 of this embodiment supports the steam generator 100. However, the structure is not limited to the steam generator 100, and may be another structure. Also, the ring frame may not be required.

[0013] The steam generator 100 is disposed in a predetermined room 101 in the reactor containment vessel. The room 101 is, for example, a rectangular column-shaped space with an open top, and a wall 102 is disposed on the other side. A ring frame 103 is disposed around the steam generator 100, and the ring frame 103 is suspended and supported by the steam generator 100. A support device 104 is disposed on the wall 102 and supports the ring frame 103 of the steam generator 100.

[0014] The support device 104 has a hydraulic vibration isolator 10 provided on the wall portion 102. A bracket 105 is fixed to a wall surface 102a of the wall portion 102. One end of the hydraulic vibration isolator 10 is fixed to the bracket 105, and the other end contacts and presses against an outer surface 103a of the ring frame 103. The support device 104 has a plurality of block bodies (not shown) provided on the wall portion 102 around the steam generator 100.

[0015] <Hydraulic vibration isolation device> FIG. 3 is a cross-sectional view showing the hydraulic vibration isolation device of this embodiment.

[0016] The hydraulic vibration damping device 10 includes a cylinder 11, a piston 12, a rod 13, a communication passage 14, and a compression coil spring (biasing member) 15.

[0017] The cylinder 11 has a hollow cylindrical shape centered on an axis O. The cylinder 11 is filled with oil. One side (the right side in FIG. 3) in the axial direction (the left-right direction in FIG. 3) of the cylinder 11 is closed, and a circular opening 11a is formed on the other side (the left side in FIG. 3).

[0018] The piston 12 is supported so as to be freely movable inside the cylinder 11. The piston 12 has a disk shape centered on the axis O, and its outer peripheral surface is fitted into the inner peripheral surface of the cylinder 11, so that the piston 12 is supported so as to be freely movable in the axial direction. The piston 12 divides the interior of the cylinder 11 into two hydraulic chambers 21 and 22. The volumes of the two hydraulic chambers 21 and 22 change as the piston 12 moves inside the cylinder 11. The piston 12 has a recess 23 formed on one axial surface.

[0019] The rod 13 has a cylindrical shape centered on the axis O. One axial end (base end) of the rod 13 is connected to the piston 12, and the other axial end (tip end) protrudes to the outside of the cylinder 11 through the opening 11a. The tip surface of the other end of the rod 13 serves as the pressing surface 13a.

[0020] The communicating passage 14 is formed in the piston 12 along the axial direction. The communicating passage 14 is a through-hole formed in the piston 12 at a position radially outwardly shifted from the axis O, and connects the two hydraulic chambers 21, 22. One or more communicating passages 14 are provided in the piston 12. The communicating passage 14 has an inner diameter smaller than the inner diameter of the cylinder 11, so the speed of the flowing oil is limited. In addition, an excess flow valve 24 is disposed in the communicating passage 14. The excess flow valve 24 opens when oil flows through the communicating passage 14 at a rate less than a predetermined flow rate, and closes when oil flows at a rate equal to or greater than the predetermined flow rate. In addition to the excess flow valve 24, an orifice may be provided.

[0021] In the above description, the communicating passage 14 is a through-hole formed in the piston 12, connecting the two hydraulic chambers 21, 22, but the present invention is not limited to this configuration. For example, the communicating passage 14 may be a conduit that connects the two hydraulic chambers 21, 22 outside the cylinder 11, and the two hydraulic chambers 21, 22 may be connected via an oil reservoir. In this case, the excess flow valve 24 is disposed inside the oil reservoir.

[0022] The compression coil spring 15 is disposed in the hydraulic chamber 22 of the cylinder 11. That is, the compression coil spring 15 is disposed between one surface of the cylinder 11 and one surface of the piston 12. At this time, the other end of the compression coil spring 15 is disposed in the recess 23. By being disposed between the cylinder 11 and the piston 12 in a compressed state, the compression coil spring 15 biases the piston 12 in a direction in which the tip end of the rod 13 contacts and presses the ring frame 103. Note that the biasing member is not limited to the compression coil spring 15, and may be, for example, a leaf spring, a disc spring, a rubber member, a resin member, or the like.

[0023] In the hydraulic vibration isolator 10, one end of the cylinder 11 is fixed to a bracket 105 fixed to a wall portion 102. The hydraulic vibration isolator 10 is urged in a direction in which the tip of the rod 13 protrudes from the cylinder 11 by the urging force of the compression coil spring 15. Therefore, in the hydraulic vibration isolator 10, the pressing surface 13a of the rod 13 contacts and presses the outer surface 103a of the ring frame 103. Note that the ring frame 103 may be eliminated, and the pressing surface 13a of the rod 13 of the hydraulic vibration isolator 10 may directly contact and press the outer surface of the steam generator 100.

[0024] <Modification> FIG. 4 is a cross-sectional view of a main part showing a modification of the hydraulic vibration damping device of this embodiment.

[0025] 4, the hydraulic vibration damping device 10A includes a cylinder 11, a piston 12 (see FIG. 3), a rod 13A, a communication passage 14 (see FIG. 3), and a compression coil spring 15 (see FIG. 3). The cylinder 11, the piston 12, the communication passage 14, and the compression coil spring 15 have the same configuration as in the above-described embodiment.

[0026] A spherical seat 31 is connected to the other end of the rod 13A. A spherical recess 13b is formed at the other end of the rod 13A. The spherical seat 31 is configured by integrally forming a spherical protrusion 32 and a plate-shaped flange portion 33. It is desirable that the recess 13b of the rod 13A and the protrusion 32 of the spherical seat 31 have the same curvature, but the curvature of the protrusion 32 may be larger than the curvature of the recess 13b of the rod 13A. The rod 13A has a female thread portion 13c formed in the recess 13b along the axis O. The spherical seat 31 has a through hole 32a formed in the protrusion 32 along the axis O, and a through hole 33a formed in the flange portion 33 along the axis O. The through hole 32a of the protrusion 32 and the through hole 33a of the flange 33 communicate with each other, and the inner diameter of the through hole 33a of the flange 33 is larger than the inner diameter of the through hole 32a of the protrusion 32.

[0027] Spherical seat 31 is connected to the other end of rod 13A by a fixing bolt 34. Spherical seat 31 has convex portion 32 that fits into concave portion 13b of rod 13A. Fixing bolt 34 is inserted from the spherical seat 31 side into through hole 33a of flange portion 33, passes through through hole 32a of convex portion 32, and threaded portion 34a is screwed into female threaded portion 13c of rod 13A.

[0028] Because the outer diameter of the threaded portion of the fixing bolt 34 is smaller than the inner diameter of the through-hole 32a of the convex portion 32, a gap is secured between the outer peripheral surface of the threaded portion 34a of the fixing bolt 34 and the inner peripheral surface of the through-hole 32a of the convex portion 32. Furthermore, when the threaded portion 34a of the fixing bolt 34 is threadedly engaged with the female threaded portion 13c of the rod 13A, a gap is secured between the head 34b of the fixing bolt 34 and the stepped portions of the through-holes 32a, 33a. Therefore, the spherical seat 31 is free to swing along the spherical direction relative to the rod 13A. Furthermore, the tip of the flange portion 33 of the spherical seat 31 forms a pressing surface 31a.

[0029] <Support structure of the structure> As shown in FIGS. 2 and 3, the hydraulic vibration isolation devices 10, 10A have a cylinder 11 fixed to a bracket 105 on a wall portion 102, and rods 13, 13A contacting and pressing against a ring frame 103 attached to the steam generator 100.

[0030] When the temperature of the steam generator 100 rises, the thermal expansion of the equipment and piping causes the steam generator 100 to move horizontally. As a result, the rods 13, 13A in contact with the ring frame 103 of the hydraulic vibration isolators 10, 10A are pushed and moved, causing the pistons 12 to move. The pistons 12 move to the right in FIG. 3, and oil in the hydraulic chambers 22 moves to the hydraulic chambers 21 through the communicating passages 14. At this time, the hydraulic vibration isolators 10, 10A maintain a state in which the rods 13, 13A are in contact with the ring frame 103.

[0031] On the other hand, when the temperature of the steam generator 100 drops, the thermal contraction of the equipment and piping causes the steam generator 100 to move horizontally. As a result, in the hydraulic vibration isolators 10, 10A, the rods 13, 13A in contact with the ring frame 103 move together with the ring frame 103, and the pistons 12 move. The pistons 12 move to the left in FIG. 3, and the oil in the hydraulic chambers 21 moves to the hydraulic chambers 22 through the communicating passages 14. At this time, the hydraulic vibration isolators 10, 10A maintain a state in which the rods 13, 13A are in contact with the ring frame 103.

[0032] Furthermore, when horizontal displacement is applied to the steam generator 100 due to an earthquake or the like, the ring frame 103 also displaces horizontally. In the hydraulic vibration isolation devices 10, 10A, the pressing surfaces 13a, 31a of the rods 13, 13A are constantly in contact with the outer peripheral surface 113a of the ring frame 103 due to the biasing force of the compression coil spring 15. Therefore, when the ring frame 103 displaces horizontally, the rods 13, 13A and the piston 12 are displaced, and oil inside the cylinder 11 moves between the hydraulic chambers 21 and 22 through the communicating passage 14. When a rapid displacement is applied, the movement of the oil flowing through the communicating passage 14 is restricted by the excess flow prevention valve 24, thereby restricting the movement of the piston 12 and the rods 13, 13A. This restricts the movement of the rods 13, 13A that are in contact with the ring frame 103, and therefore restricts the displacement of the ring frame 103 and the steam generator 100.

[0033] The hydraulic vibration damping device 10A is connected to the spherical seat 31 at the tip of the rod 13A. Therefore, even if the angle of the outer surface 103a of the ring frame 103 changes, the spherical seat 31 swings relative to the rod 13A, allowing the hydraulic vibration damping device 10A to properly support the ring frame 103.

[0034] [Effects of this embodiment] The hydraulic vibration damping device of the first embodiment comprises a hollow cylinder 11 filled with oil, a piston 12 that is movable within the cylinder 11 and separates two hydraulic chambers 21, 22, rods 13, 13A that have one end connected to the piston 12 and the other end protruding outside the cylinder 11, a connecting passage 14 that connects the two hydraulic chambers 21, 22, and a compression coil spring (biasing member) 15 that biases the piston 12 in the direction in which the tip of the rod 13 contacts and presses against a ring frame 103 (steam generator 100) as a structure.

[0035] According to the hydraulic vibration isolation device of the first aspect, when the steam generator 100 and ring frame 103 as structures are displaced in the horizontal direction, the displacement is transmitted to the rods 13, 13A that are constantly in contact with the outer peripheral surface 113a of the ring frame 103, displacing the piston 12. At this time, the flow rate of the oil flowing through the communicating passage 14 is limited, so the movement of the piston 12 and the rods 13, 13A is limited, and the displacement of the steam generator 100 can be restrained.

[0036] In this case, the hydraulic vibration isolators 10, 10A do not need to be connected, as the rods 13, 13A simply contact the ring frame 103. Therefore, the hydraulic vibration isolators 10, 10A do not need a connecting structure between the rods 13, 13A and the ring frame 103, which simplifies the structure and shortens the overall length, making it possible to apply the devices to narrow spaces.

[0037] The hydraulic vibration damping device according to the second aspect is the hydraulic vibration damping device according to the first aspect, and further includes a recess 23 formed in the piston 12, and a compression coil spring 15 disposed in the recess 23. This allows the compression coil spring 15 to be disposed efficiently, thereby shortening the axial length of the cylinder 11.

[0038] The hydraulic vibration damping device according to the third aspect is the hydraulic vibration damping device according to the first or second aspect, and further includes an excess flow valve 24 disposed in the communication passage 14. This allows the excess flow valve 24 to limit the speed of the oil flowing through the communication passage 14, allowing an appropriate restraining force to be generated.

[0039] The hydraulic vibration damping device according to the fourth aspect is the hydraulic vibration damping device according to any one of the first to third aspects, and further has the rod 13A connected to the other end thereof with a spherical seat 31. As a result, even if the angle between the steam generator 100 and the outer surface 103a of the ring frame 103 changes, the spherical seat 31 swings relative to the rod 13A, so that the pressing surface 31a appropriately contacts the outer surface 103a of the ring frame 103, and displacement of the steam generator 100 can be restrained.

[0040] The support structure for a structure according to the fifth aspect is a support structure for a steam generator (structure) 100 arranged adjacent to a wall 102, and in the hydraulic vibration isolation device 10, 10A according to any one of the first to fourth aspects, the cylinder 11 is connected to the wall 102, and the other end of the rod 13, 13A presses against the ring frame 103 of the steam generator 100. As a result, the hydraulic vibration isolation device 10, 10A does not require a connecting structure between the rod 13, 13A and the ring frame 103, which simplifies the structure and shortens the overall length, allowing the device to be made more compact and applicable to narrow spaces.

[0041] In addition, in the above-described embodiment, the structure is the steam generator 100, but it may be another structure. The hydraulic vibration isolation device of the present invention is effective for a configuration in which the gap between the structure and supporting members such as surrounding walls is short. [Explanation of symbols]

[0042] 10,10A Hydraulic vibration isolation device 11 cylinders 12 pistons 13,13A Rod 14 Communication path 15 Compression coil spring (biasing member) 21,22 Hydraulic chamber 23 Recess 24 Excess flow prevention valve 31 Spherical seat 100 Steam generator (structure) 102 Wall 103 Ring Frame (Structure) 104 Support device

Claims

1. a hollow cylinder filled with oil; a piston that is movable within the cylinder and that divides two hydraulic chambers; a rod having one end connected to the piston and the other end protruding outside the cylinder; a communication passage that communicates the two hydraulic chambers; a biasing member that biases the piston in a direction in which the tip end of the rod contacts and presses against a structure; A hydraulic vibration isolation device comprising:

2. The piston has a recess, and a compression coil spring serving as the biasing member is disposed in the recess.

2. The hydraulic vibration isolation device according to claim 1.

3. The communication passage is provided with an excess flow prevention valve.

2. The hydraulic vibration isolation device according to claim 1.

4. The rod has a spherical seat connected to the other end thereof. The hydraulic vibration isolation device according to any one of claims 1 to 3.

5. A support structure for a structure disposed adjacent to a wall portion, In the hydraulic vibration isolation device according to claim 1, the cylinder is connected to the wall portion, and the other end of the rod presses against the structure. Support structure of the structure.

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