JPS6330533B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oil refilling device for a hydraulic vibration isolator that allows an oil reservoir of the hydraulic vibration isolator to be refilled with oil from a remote location.

For example, in chemical plants, nuclear power plants, etc., hydraulic vibration isolators are sometimes used to isolate piping and various equipment from vibration. An example of this type of vibration isolator is shown in FIG. That is, a piston 2 is slidably housed in a cylinder 1, and the piston 2 partitions the inside of the cylinder into a first oil chamber 3 and a second oil chamber 4. and the first oil chamber 3 and the second oil chamber
The oil chambers 4 are communicated with each other via a circulating oil path 5, and automatic on-off valves 6 and 7 having the same structure are provided at two locations in the middle of this oil path 5. Each automatic on-off valve 6, 7 has valve bodies 8, 9 facing in opposite directions. These valve bodies 8, 9 are normally operated by springs 10,
It is separated from the valve seats 12 and 13 by the elastic force of the piston 11, allowing the passage of the hydraulic oil 14, but as the speed of the piston 2 increases, the pressure of the hydraulic oil causes the valve bodies 8 and 9 to separate. The valve body that receives pressure moves in the valve closing direction to restrict the flow of hydraulic oil. That is, when the piston 2 moves slowly, the valve bodies 8 and 9 open to allow the movement of the piston 2, but when the piston 2 moves at high speed, the flow of the hydraulic oil 14 is suppressed and a reaction force is applied to the piston 2. It happens.

Therefore, movement of the pipe or equipment is allowed without producing harmful reaction forces against slow movement of the pipe or equipment due to thermal expansion or the like. On the other hand, in the case of relatively high-frequency vibrations such as earthquakes, fluctuations in fluid flowing in pipes, or wind damage, the piston 2 moves relatively at high speed, so it is not possible to exert damping force for the above reasons. can. In FIG. 1, reference numeral 15 indicates an oil reservoir into which hydraulic oil is taken in and out in response to changes in the volume of hydraulic oil in the oil chamber and oil leakage to the outside, and reference numeral 16 indicates an oil passage leading to this oil reservoir 15.

As you can see from the above explanation, a hydraulic vibration isolator only works if it is filled with oil (hydraulic oil).
It can exhibit sufficient vibration damping ability. However, as described above, internal pressure is generated in the oil as the piston moves, and the oil also flows, so it is difficult to completely eliminate leakage at seals and the like. Furthermore, when the seal wears out and deteriorates, the amount of leakage increases. As a result, the oil stored in the oil reservoir is used up, and air enters the cylinder, which is undesirable because it causes a reduction in the vibration damping effect.

Moreover, hydraulic vibration isolators can be installed in various positions and directions for the purpose of damping vibrations in piping, equipment, etc. Therefore, it is not always possible to easily monitor and check the amount of oil in the oil reservoir. For example, if a hydraulic vibration isolator is installed near the ceiling or in a location without scaffolding, it may be necessary to construct scaffolding to monitor the oil level. This required dangerous work and a great deal of labor, and especially in the case of nuclear power plants, there was a restriction on exposure time, making the work extremely inefficient. Furthermore, even when a shortage of oil is discovered, replenishment cannot be easily carried out.

The present invention was made based on the above circumstances, and
The purpose is to display the oil level in the oil reservoir in a monitoring area where it can be easily inspected, and also to allow oil to be refilled remotely, reducing inspection and refilling man-hours and stabilizing work. To provide an oil replenishing device for a hydraulic vibration isolator that can ensure performance.

That is, the gist of the present invention is to provide a liquid level detection mechanism in which a sensor section is provided in the oil reservoir of a hydraulic vibration isolator, and a liquid level detection mechanism that is provided at a position different from the hydraulic vibration isolator and is controlled by the liquid level detection mechanism. a liquid level indicator that displays the detected liquid level position of the oil reservoir;
A replenishment tank also provided at a different position from the hydraulic vibration isolator and connected to the oil reservoir through an oil replenishment passage, a supply valve that can be opened and closed provided in the middle of the oil replenishment passage, and the liquid level detection When the mechanism detects that the liquid level in the oil reservoir is below a set value, the supply valve opens and the oil in the replenishment tank is automatically supplied to the oil reservoir up to the set value. A supply mechanism is provided.

According to the above configuration, since the oil reservoir can be monitored and oil refilled at a remote location away from the installation site of the hydraulic vibration isolator, the man-hours for inspection and replenishment can be reduced, and there is no need to go to adverse environments, making it safer. be. In addition, we erected scaffolding for monitoring and inspection,
If you make a hole in the ceiling, there is no need for a hole. Furthermore, in the past, for example, in nuclear power plants, it was not possible to check the reservoir oil level during reactor operation due to radiation dose, and there were some locations that could only be checked during periodic inspections, but with the present invention, the reservoir oil level can be checked at all times. It plays a very important role in improving the reliability of hydraulic vibration isolators because it can monitor and automatically replenish oil.

An embodiment of the present invention will be described below with reference to FIG. In the figure, 20 indicates a hydraulic vibration isolator. The structure of this hydraulic vibration isolator 20 may be similar to that of FIG. 1 described above. That is,
The cylinder 1 is filled with oil (hydraulic oil), and a piston 2 is slidably inserted therethrough. For example, the connector 22 provided on the support structure such as a building, etc.
They are now connected to each other.

The oil reservoir 15 communicating with the cylinder 1 is provided with a sensor section 24 that constitutes a part of the liquid level detection mechanism 23. The liquid level detection mechanism 23 detects the liquid level in the oil reservoir 15 using a principle known as an air micrometer. More specifically, 25 in the figure represents the sensor section 2.
This air supply pipe 24 is an air supply pipe that sends compressed air to the level sensing relay 26.
It is connected to the. Compressed air is supplied to the level sensing relay 26 from a compressed air source 28 through an air pipe 27. Then, the level sensing relay 26 is used to amplify the pressure change depending on the liquid level position that occurs when the compressed air is ejected from the sensor section 24 into the reservoir 15.
It is designed to be displayed on the liquid level indicator 30. The liquid level indicator 30 is placed in a monitoring area different from the installation site of the hydraulic vibration isolator 20, for example in a nuclear power plant, in a monitoring area shielded from radiation by a shielding wall 31, etc. The liquid level can be constantly monitored even when the reactor is operating.

Also, a replenishment tank 32 with a relatively large capacity is provided at a location away from the hydraulic vibration isolator 20. This replenishment tank 32 is of a closed type that can store oil and compressed air therein, and is connected to the oil reservoir 15 through an oil replenishment passage 33. This oil replenishment passage 33
As shown in FIG. 2, a plurality of systems are provided, each of which is connected to the oil reservoir of a separate system of hydraulic vibration isolators (not shown).

Further, the replenishment tank 32 includes a drain valve 35,
Purge valve 36, oil fill valve 37, air supply valve 3
8, etc., and a liquid level indicator 3.
9 is also provided.

Supply valves 40 are provided in the middle of the oil replenishment passages 33, respectively. These supply valves 40... are connected to the level sensing relay 26
The opening/closing is controlled pneumatically by signals from the Further, the air supply valve 38 is also controlled to open and close by pneumatic pressure in response to a signal from the level sensing relay 26. The supply valve 40 and the air supply valve 38 are constructed so that they can be opened and closed manually.

The above level sensing relay 26 and supply valve 40
The air supply valve 38 and the like also constitute an automatic oil supply mechanism 41. That is, the automatic oil supply mechanism 41 opens the supply valve 40 and the air supply valve 38 when the liquid level detection mechanism 23 detects that the liquid level in the oil reservoir 15 is below the set value. The oil in the replenishment tank 32 is pumped to the oil reservoir 15 through the oil replenishment passage 33 by compressed air pressure. If it is detected that the liquid level in the oil reservoir 15 has reached the set value, the supply valve 40 and the air replenishment valve 38
is configured to close and stop replenishment.

Further, the automatic oil supply mechanism 41 is provided with a counter 42 for counting the number of times the supply valve 40 is operated.

In order to replenish the replenishment tank 32 with oil, open the purge valve 36 to bring the inside of the tank to atmospheric pressure, and then inject oil from the oil injection valve 37 while watching the liquid level indicator 39.

According to the above embodiment, not only can the amount of oil in the oil reservoir 15 be constantly monitored in a safe monitoring area, but also oil can be automatically replenished even when the amount of oil in the reservoir decreases, which saves time and effort. It doesn't hang. Additionally, oil can be refilled manually if necessary.

Furthermore, since the counter 42 allows the number of times the supply valve 40 is operated to be known, the hydraulic vibration isolator 2
You can know the extent of oil leakage that occurred in 0.
This makes it possible to accurately judge the state of deterioration of the seal and the timing of seal replacement.

Further, since a means such as an air micrometer that constantly sends air into the oil reservoir 15 is adopted as the liquid level detection mechanism 23, the pressure inside the oil reservoir 15 is always higher than atmospheric pressure.
Therefore, it is possible to prevent foreign substances such as moisture and dust in the atmosphere from entering the hydraulic vibration isolator 20 through the oil reservoir 15.

Furthermore, since the liquid level detection mechanism 23, the supply valve 40, the air replenishment valve 38, etc. are pneumatically controlled, it is resistant to electrical noise and provides high reliability.

Note that the present invention can be similarly applied to any hydraulic vibration isolator other than the structure shown in FIG. 1, as long as it is equipped with an oil reservoir. In addition to air control, gas (e.g.
_N2 , etc.) may be used.

As described above, according to the present invention, the labor required for inspecting and refilling the oil reservoir is greatly simplified.
It is also very effective in making inspection and replenishment work safer.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing an example of the structure of a hydraulic vibration isolator, and FIG. 2 is a system diagram of an oil refilling device showing an embodiment of the present invention. 15...Oil reservoir, 20...Hydraulic vibration isolator, 23...Liquid level detection mechanism, 24...Sensor section,
30...Liquid level indicator, 32...Replenishment tank, 33
... Oil replenishment passage, 40 ... Supply valve, 41 ...
Oil automatic supply mechanism, 42...counter.

Claims (1)

[Claims] 1. A liquid level detection mechanism including a sensor section in an oil reservoir of a hydraulic vibration isolator, and a liquid level detection mechanism provided at a position different from the hydraulic vibration isolator and detected by the liquid level detection mechanism. a liquid level indicator that displays the liquid level position of the oil reservoir; a replenishment tank that is also located at a different position from the hydraulic vibration isolator and is connected to the oil reservoir through an oil replenishment passage; When the liquid level detection mechanism detects that the liquid level in the oil reservoir is below a set value, the supply valve is opened and the replenishment tank is opened. An oil replenishing device for a hydraulic vibration isolator, comprising: an automatic oil supply mechanism that supplies oil within the oil reservoir up to a set value. 2. The oil replenishing device for a hydraulic vibration isolator according to claim 1, wherein the automatic oil supply mechanism includes a counter that counts the number of times the supply valve is operated. 3. Claim 1 or 3, characterized in that the liquid level detection mechanism is an air micrometer that measures the liquid level position based on pressure changes while feeding compressed air into the oil reservoir. 2. The oil replenishment device for a hydraulic vibration isolator according to item 2.