JPH0429143Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention was developed in order to protect piping systems, etc. from vibrations caused by earthquakes in nuclear power plants, etc., by installing pipes interposed between them and supporting bodies such as structures. This invention relates to improvements in valve devices used in hydraulic vibration isolators.

(Prior Art) For example, as shown in FIG. 3, the hydraulic vibration isolator 21 has a piston 23 inserted into a cylinder 22, and oil chambers on both sides of the piston 23 are connected to each other through a pair of valve devices 24 in opposite directions. Either the cylinder 22 or the piston rod 25 is connected to a piping system, and the other is connected to a support such as a structure. As the valve device 24, for example,
It is known that a substantially cylindrical valve body 27 having a flow hole 27a is inserted into a valve box 26. In this valve device 24, the hydraulic oil that has flowed into the valve body 27 from the inlet 26a at a speed higher than a predetermined speed is transferred to the flow hole 27.
The flow resistance when passing through a causes the valve body 27 to move against the spring force and close the inlet port 26b, thereby stopping the flow of hydraulic oil and restraining the movement of the piston 23 to provide a vibration-proofing effect. It's something you get.

(Problems to be Solved by the Invention) In the conventional valve device 24 described above, the hydraulic oil speed at which the valve closes is adjusted by the size of the flow hole 27a of the valve body 27. Bento box 2
Since an orifice effect occurs due to the flow of hydraulic oil also in the gap between the outlet port 26b of There is a problem in that changes no longer affect the operating sensitivity of the valve device 24, making it impossible to adjust the sensitivity of the valve device 24.

In addition, the valve lift, which affects the operating sensitivity of the valve device, varies due to manufacturing errors, so it is not easy to obtain the desired valve lift, resulting in an error in the operating sensitivity between a pair of valve devices. There is also the problem that the effect phenomenon tends to occur. That is, in the case of a normal one-side rod type hydraulic vibration isolator, the cross-sectional area of the oil chambers on both sides of the piston 23 differs due to the presence of the rod 25, and the rod 25 moves in and out under the same conditions of moving speed and distance of the piston 23. When moving, it is necessary to set the orifice cross-sectional area and valve lift of the two valve devices 24, 24 in accordance with the cross-sectional area ratio of the oil chambers on both sides. As shown in FIG. 3, the conventional valve device has the problem that the orifice cross-sectional area and the valve lift must be adjusted separately, and these adjustments are extremely difficult.

This invention solves the above-mentioned conventional problems and allows adjustment of the valve lift and orifice to be performed at the same time, and as a result, it is possible to change the operating sensitivity of the valve regardless of machining errors. The present invention aims to provide a valve device for a hydraulic vibration isolator that can be used in a hydraulic vibration isolator.

(Means for Solving the Problems) In order to solve the above-mentioned conventional problems, this invention provides a valve body 1 having a hydraulic oil inlet 2 and an outlet 3 communicating therewith, and The annular valve seat surface 5 provided on the inlet port 2 side of the valve body 1 and the flange 6b can be moved in the axial direction so as to move toward and away from the valve seat surface 5, and the threaded portion 6c is removed from the valve body 1. A valve body 6 protruding outward in the axial direction, this valve body 6 and the valve body 1
A spring 8 is interposed between the spring 8 and the spring 8 that biases the collar 6b away from the valve seat surface 5, and the spring 8 is screwed onto the threaded portion 6c of the valve body 6 on the outside of the valve body 1. Adjustment nut 7 for adjusting the lift
A valve device for a hydraulic vibration isolator was constructed.

(Function) Hydraulic vibration isolator 1 due to vibration of supported objects such as piping systems
When the first piston 14 moves, hydraulic oil attempts to enter and exit between the oil chambers on both sides of the cylinder 12 via the valve device. However, when the flow velocity of the hydraulic oil is higher than a predetermined value, the flange 6b of the valve body 6 and the valve seat surface 5
The valve body 6 is pushed by the flow resistance of the oil flowing through the gap between the valve body 6 and the flow passage, thereby blocking the flow of hydraulic oil. Therefore, the movement of the piston 14 is restricted, and a vibration damping effect can be obtained.

In this valve device, in order to adjust the flow rate of hydraulic oil for operating the valve, the position of the valve body 6 may be changed by turning the adjustment nut 7. In this way, the cross-sectional area of the orifice between the collar 6b of the valve body 6 and the valve seat surface 5 and the valve lift can be adjusted at the same time.

Note that when the supported body is slowly displaced due to temperature changes or the like, the flow rate of the hydraulic oil is low and the valve body 6 cannot be operated. Therefore, the supported body is easily displaced.

(Example) The valve box 1 has a hydraulic oil inlet 2 and an outlet 3 communicating with the inlet. The outflow port 3 opens at a position of 90° with respect to the inflow port 2. Also, valve box 1
A through hole 4 is formed straight from the inlet 2 in the axial direction thereof, and an annular valve seat surface 5 is provided near the inlet 2.

The valve body 6 includes a valve stem 6a and a flange 6b formed at one end thereof, and is provided in the valve body 1 so as to be freely movable in the axial direction by inserting the valve stem 6a into the through hole 4. Then, the valve body 6 moves in the axial direction,
The collar 6b can be brought into contact with and separated from the valve seat surface 5. A threaded portion 6c is formed at the other end of the valve stem 6a, and an adjustment nut 7 is screwed into this threaded portion that protrudes from the valve body.

The push spring 8 is inserted into the valve stem 6a, and between the collar 6b and the valve box 1, urges the collar 6b in a direction away from the valve seat surface 5.

Therefore, this valve device is used, for example, in a hydraulic vibration isolator 11 as shown in FIG. The hydraulic vibration isolator 11 in this embodiment has a cylinder 12 and a casing 13, and the cylinder 12 is immersed in hydraulic oil in the casing 13.

A piston 14 is inserted into the cylinder 12, and its piston rod 14a is inserted into the cylinder 12.
2. It passes through one end wall 12a, 13a of the casing 13 and extends outward.

The valve device includes both end walls 12a, 12 of the cylinder 12.
b, facing in opposite directions.
That is, both end walls 12a and 12b themselves constitute a valve box 1, a hydraulic oil outlet 2 opens into the cylinder 12, and an outlet 3 opens into the hydraulic oil in the casing 13 outside the cylinder 12. It's open.

Next, the operation of this embodiment will be explained.

First, before installing the hydraulic vibration isolator 11, the operating sensitivity of the valve, that is, the flow rate of the hydraulic oil to be operated is set. This is done by turning adjustment nut 7.
This is done by changing the position of the valve body 6. In this way, the cross-sectional area of the orifice between the collar 6b of the valve body 6 and the valve seat surface 5 and the valve lift can be adjusted at the same time.

In this case, since the orifice is formed only between the collar 6b and the valve seat surface 5, there is no need to consider unexpected orifice effects in other parts. Therefore, the above adjustment allows the operation of the valve device to be completely controlled. can be controlled.

The hydraulic vibration isolator 11 is used by, for example, connecting the casing 13 to a structure and the piston rod 14a to a piping system. When the piping system vibrates and the piston 14 moves, hydraulic oil attempts to flow in and out from the oil chambers on both sides of the cylinder 12 via the valve device. However, when the flow velocity of the hydraulic oil is higher than a predetermined value, the flange 6b of the valve body 6 and the valve seat surface 5
Due to the flow resistance of the oil flowing through the gap between the valve body 6
is pushed and cuts off the flow path, cutting off the flow of hydraulic fluid. Therefore, the movement of the piston 14 is restricted, and a vibration damping effect is performed.

(Effect of the invention) As explained above, in this invention, the hydraulic oil inlet 2 and the outlet 3 communicating with the hydraulic oil inlet 2
A valve box 1 having a valve box 1, an annular valve seat surface 5 provided on the inlet 2 side in the valve box 1, and a collar 6b moved in the axial direction so as to move toward and away from the valve seat surface 5. The threaded portion 6c is interposed between the valve body 6 and the valve body 1, and the threaded portion 6c protrudes outward from the valve body 1 in the axial direction. A valve for a hydraulic vibration isolator is provided with a biasing spring 8 and an adjustment nut 7 which is screwed onto the threaded portion 6c of the valve body 6 outside the valve body 1 and adjusts the valve lift by the relative position thereof. Because of the structure of the device, the orifice cross-sectional area and valve lift can be adjusted simultaneously, and the valve operating sensitivity can be adjusted regardless of processing errors. Moreover, it has the effect that this adjustment is easy.

Therefore, when this valve device is used in a one-sided rod-type hydraulic vibration isolator, when the moving speed and distance of the piston are the same in both the tension direction and the compression direction of the rod, two Since the valve device can be operated easily and accurately, the performance of the one-sided rod type hydraulic vibration isolator can be dramatically improved to have the same performance as the double-sided rod type.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a valve device to which this invention is applied.
FIG. 2 is a sectional view of a hydraulic vibration isolator using the valve device, and FIG. 3 is an explanatory diagram of a conventional hydraulic vibration isolator. 1...Valve box, 2...Inflow port, 3...Outflow port, 5
...Valve seat surface, 6... Valve body, 6b... Tsuba, 6c...
Threaded part, 7...Adjusting nut, 8...Spring, 11...
…Hydraulic vibration isolator.

Claims (1)

[Scope of utility model registration request] A valve box having a hydraulic oil inlet and an outlet communicating with the inlet, an annular valve seat surface provided on the inlet side of the valve box, and a flange that is brought into contact with and separated from the valve seat surface. A valve body that is movable in the axial direction and has a threaded portion protruding from the valve body in the axial direction, and a valve body that is interposed between the valve body and the valve body and that moves the flange away from the valve seat surface. A valve device for a hydraulic vibration isolator, comprising: a spring biasing the valve body; and an adjustment nut screwed onto a threaded portion of the valve body outside the valve body.