JP6534274B2 - Remote monitoring device for piping vibration control - Google Patents

Description

  The present invention supports a pipe in a nuclear power plant, a thermal power plant, a chemical plant or the like on a support such as a structure, and allows a slow movement of the pipe against thermal displacement etc. while attenuating vibration due to earthquake etc. Detection of the stroke position of the rod to prevent excessive displacement of the pipe.

  Conventionally, a hydraulic vibration isolator is provided with a cylinder tube and a piston rod inserted into the cylinder tube so as to be freely moved in and out. There is one that performs a vibration damping action by hydraulic pressure based on the above (Patent Document 1). The hydraulic isolator is provided with a locking device for fixing the rod at a predetermined relative position to the cylinder tube in order to attach it to the pipe. The locking device fixes one end of the indicator having a length scale to the rod, extends the other end in the moving direction of the rod toward the cylinder tube, and moves the indicator along the guide member fixed to the cylinder tube, Align the guide member to the predetermined scale position of the indicator and lock it with a butterfly bolt to fix the rod. While installing the anti-vibration device in the fixed state of the rod, after installation, loosen the butterfly bolt and release the restraint of the indicator to allow the rod to move freely, enabling the use of the anti-vibration device and preventing The amount of displacement of the rod associated with the displacement of the vibration target can be read on the scale of the indicator. In addition, the indicator strokes the rod's stroke position simply by coloring the normal operating range, the caution range, and the boundary of the stroke limit on both sides, centering on the stroke position of the rod at the time of installation of the hydraulic vibration isolator The one that can be visually checked is actually used.

Japanese Patent Application Laid-Open No. 10-196707

In the above conventional hydraulic vibration isolator, it is necessary to go directly to the installation site and visually check the indicator in order to confirm whether it is operating properly. For example, since facilities in the power plant require hydraulic shock absorbers for earthquake resistance, and many hydraulic shock absorbers are installed particularly for piping facilities, it is necessary to check the stroke position that is an indication of normal operation. A great deal of time and effort is spent, and the maintenance burden is heavy. In addition, depending on the operating conditions of the power plant and the installation target of the hydraulic vibration isolator, the installation position may be a no-entry area, and it may not be possible to realistically check the stroke position.
Therefore, according to the present invention, the relative displacement of the rod with respect to the cylinder member of the vibration isolator is confirmed at a remote position without going to the installation site, and the vibration isolator and hence the remote monitoring of the vibration isolator for piping is monitored. It is an issue to provide an apparatus.

In order to solve the above-mentioned problems, in the present invention, a rod D2 is connected to one of a support or a pipe and has a cylinder D1 internally filled with hydraulic fluid, and a rod D2 coupled to a piston partitioning the inside into a hydraulic chamber Insert and connect the other of the support or piping to the rod D2 to suppress sudden relative movement of the rod D2 with respect to the cylinder D1 to prevent vibration of the piping, while allowing slow relative movement to thermally cool the piping A remote monitoring device 1 is configured to detect a displacement of a pipe by detecting a relative displacement amount of a rod D2 with respect to a cylinder D1 in a hydraulic damper D which enables a displacement or the like. The remote monitoring device 1 is fixed to the rod D2 and is movable according to the relative displacement of the rod D2 displaced with the pipe relative to the cylinder D1, and at a predetermined position on the way of movement corresponding to the predetermined displacement of the rod D2. The detection circuit 10a includes a switch member 2 that operates, and generates a warning signal by the operation of the switch member 2. The communication device 4 transmits the warning signal of the detection circuit 10a to a remote position.
The switch member 2 includes a trigger piece 5 made of a magnet fixed on the cylinder D1, a movable holder 6 that linearly displaces the proximity position of the trigger piece 5 on the cylinder D1 with the rod D2, and the movable holder 6 And a pair of reed switches 7 and 7 which are fixed at intervals in the moving direction and operated by the magnetic field of the trigger piece 5 which approaches with the displacement of the movable holder 6. The operation of the reed switch 7 causes the detection circuit 10a to warn It was configured to emit a signal.

  In the present invention, it is possible to confirm the stroke position of the hydraulic vibration isolator at a remote position without going to the installation site of the hydraulic vibration isolator, and it takes time and effort to check the state of many hydraulic vibration isolators installed in the power plant. This can be done easily and can reduce the cost of the hydraulic vibration isolator and the maintenance surface targeted for vibration isolation. In addition, even if the installation place of the hydraulic vibration isolator is in a non-entry area, the stroke position can be confirmed safely.

It is a perspective view of the vibration control for piping which attached the remote monitoring apparatus which concerns on this invention. It is a front view of the remote monitoring apparatus of FIG. It is the side view which notched one part of the remote monitoring apparatus of FIG. It is a longitudinal cross-sectional view of a movable holder.

An embodiment of the present invention will be described with reference to the drawings.
In FIG. 1 to FIG. 3, the hydraulic vibration isolator D has one end connected to a support such as a structure, and is slidable so as to divide the hydraulic chamber into the cylinder D1 and the cylinder D1 filled with the hydraulic fluid. The piston D inserted into one end is coupled to one end, and the cylinder D1 is inserted in and out freely, and the other end includes a rod D2 connected to a pipe that is an object of vibration isolation. The hydraulic vibration damper D suppresses sudden relative movement of the rod D2 to the cylinder D1 to prevent vibrations such as earthquakes, while allowing slow relative movement of the rod D2 so as not to disturb displacement of the pipe due to temperature change. .

  Attached to the side of the hydraulic vibration isolator D is a remote monitoring device 1 that warns of abnormal operation by detecting the stroke position of the rod D2. The remote monitoring device 1 includes a switch member 2 fixed to the rod D2, and a transmission unit 4 built in a rectangular case 3 fixed to the side surface of the cylinder D1.

  The switch member 2 is, as shown in FIG. 4, a trigger piece 5 fixed on the cylinder D1, a movable holder 6 fixed to the rod D2, and a pair of the members fixed at intervals on the movable holder 6. The reed switches 7 and 7 are provided.

  The trigger piece 5 is made of a ring-shaped permanent magnet material and is fitted to the holding recess of the bracket 8 which is laterally protruded and screwed to the end wall of the insertion side of the rod D2 in the cylinder D1, and the lid plate 9 is bolted It clamps and is inserted between the brackets 8.

  The movable holder 6 is made of a steel pipe, one end of which is bolted to the fixed flange D3 so as to be displaceable together with the rod D2, the middle part passes through the bracket 8, the trigger piece 5 and the lid plate 9 and the other end is via the adapter 12 Is connected to the cable 13. The cable 13 is connected to the substrate 10 in the case 3 via the connector 14 fixed to the back plate of the case 3.

  The reed switches 7 are fixed in the movable holder 6 at a distance in the longitudinal direction. When the center position between the reed switches 7 coincides with the trigger piece 5 in the initial state of the rod D2, and the movable piece 6 approaches the trigger piece 5 due to the displacement of the movable holder 6, the contact is magnetized and turned on to close the detection circuit 10a. Generate a warning signal.

  The transmission unit 4 comprises a substrate 10 constituting a detection circuit 10 a incorporating a button battery holder and other electric elements, and a wireless module 11 mounted on the substrate 10. The detection circuit 10a on the substrate 10 forms a warning signal by the opening and closing operation of the reed switch 7 using the battery mounted on the button battery holder as a power supply. The wireless module 11 is electrically connected to the detection circuit 10a, transmits a warning signal from the detection circuit 10a, is separately disposed at a monitoring place such as a control management room at a remote position, and receives the warning signal. Construct a communicator with the receiver. A rod-shaped antenna 15 fixed to the front plate of the case 3 is connected to the wireless module 11.

  In the remote monitoring device 1, when the rod D2 is relatively displaced with respect to the cylinder D1 of the hydraulic vibration isolator D due to thermal displacement of piping, the movable holder 6 is displaced together with the rod D2, and the movement amount of the rod D2 is If it is a predetermined movement amount from the caution range to near the stroke limit, one reed switch 7 is turned on by approaching the trigger piece 5, the detection circuit 10a is closed through the cable 13, and a warning signal is output, The wireless module 11 sends a warning signal to the receiver at the monitoring location. Thereby, the displacement amount of the rod D2 of the hydraulic vibration isolator D can be confirmed at the remote position, and the countermeasure can be taken promptly.

  The reed switch 7 may perform an operation to change the open / close state of the contact due to the magnetization along with the approach of the trigger piece 5, and the detection circuit 10a may generate a warning signal in the type where the contact is magnetized and turned off. .

Reference Signs List 1 remote monitoring device 2 switch member 3 case 4 transmission unit 5 trigger piece 6 movable holder 7 reed switch 8 bracket 9 cover plate 10 base plate 10a detection circuit 11 wireless module 12 adapter 13 cable 14 connector 15 antenna D hydraulic isolator D1 cylinder D2 rod

Claims (1)

A cylinder connected to one of a support or a pipe and having a hydraulic oil filled therein, a piston partitioning an oil pressure chamber in the cylinder, and the other of a support or a pipe, and coupled to the piston And a rod which is inserted in and out freely from one end of the pipe to suppress sudden relative movement of the rod with respect to the cylinder to prevent vibration of the pipe while allowing slow relative movement to prevent thermal displacement of the pipe, etc. In a remote monitoring device for warning of reaching the vicinity of the stroke limit of the rod with respect to the cylinder in the enabling hydraulic damper,
A switch member interposed between the rod and the cylinder and operating at a predetermined relative position between the rod and the cylinder as the pipe is displaced ;
A detection circuit that issues a warning signal by the operation of the switch member;
And a communication device for transmitting a warning signal of the detection circuit to a remote position,
The switch member is a trigger piece formed of a ring-shaped magnet protruding to the side of the cylinder;
A movable holder, one end of which is fixed to the rod and extends in the axial direction of the cylinder, and the middle portion of which is a tube that freely penetrates the trigger piece;
The movable holder is fixed at a distance in the moving direction, and when the intermediate position of each other corresponds to the position of the trigger piece in the initial state of the rod and the rod moves within a predetermined warning range near the stroke limit. What is claimed is: 1. A remote monitoring device for a piping anti-vibration device , comprising: a pair of reed switches operated by approaching a trigger piece .

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