JP2007032771A - Field valve monitoring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-site valve monitoring device that does not require an external power source to detect opening and closing of an on-site valve.
A disk 14 rotates in conjunction with a handle 12 of a field valve 11 and has a slit on a surface thereof. The first piezoelectric sensor 16a contacts the disk 14 at the fully open position of the stroke of the valve stem 13, and the disk 14 slits when the handle 13 of the field valve 11 is rotated between the fully open position and the fully closed position. It moves between the fully open position and the fully closed position while being vibrated. The second piezoelectric sensor 16b is in contact with the disk 14 at the fully closed position of the stroke of the valve rod 13, and vibration is generated at the slit of the disk 14 when the handle 12 of the on-site valve 11 is rotated at the fully closed position. Given. The open / close determination device 18 determines the open / close state of the on-site valve 11 based on the electric power generated by the first piezoelectric sensor 16a and the second piezoelectric sensor 16b.
[Selection] Figure 1

Description

  The present invention relates to an on-site valve monitoring device that monitors an open / close state of an on-site valve installed on the site.

  Many plants, such as nuclear power plants, use fluids for control, so many valves are used, but it is difficult to visually determine the open / closed state of valves that are manually operated, such as needle valves. For this reason, currently, a system that hangs a tag representing the current open / close state when the valve is opened / closed is used. In this method, there is a case where the valve operation is erroneously performed due to an oversight of an inspector or a worker, and introduction of a method for reliably determining the open / closed state of the valve is desired from the viewpoint of safety.

To detect and manage valve opening and closing, a disk is attached to the valve stem of the manual valve, and the disk presses a contactless pressure switch to monitor the valve opening and closing status, and a solar cell is installed to There is one in which each device is driven by using (see, for example, Patent Document 1).
JP 2002-188754 A

  However, the place where the on-site valve is installed may be in a dark room, and in the case of a dark room, a sufficient amount of light cannot be secured, so that charging with a solar cell may not be possible. In that case, each device may not be driven.

  An object of the present invention is to provide an on-site valve monitoring device that does not require an external power source to detect opening and closing of an on-site valve.

  The field valve monitoring device of the present invention is a disk having a slit which is rotated in conjunction with a handle of a field valve installed on the field and has a slit on the surface thereof, and is in contact with the disk at a fully open position of a valve stem stroke. The first piezoelectric sensor that moves between the fully open position and the fully closed position while being vibrated by the slit of the disk when the disk is rotated between the fully open position and the fully closed position, and the stroke of the valve stem A second piezoelectric sensor that comes into contact with the disk in the fully closed position and a vibration of the slit of the disk is given when the handle of the field valve is rotated in the fully closed position; the first piezoelectric sensor; And an open / close determination device for determining an open / close state of the on-site valve based on electric power generated by the piezoelectric sensor.

  According to the present invention, the open / close state of the on-site valve is monitored using the first piezoelectric sensor and the second piezoelectric sensor, and at that time, the power generation by the first piezoelectric sensor and the second piezoelectric sensor accompanying the opening / closing operation is performed. Since the open / closed state is determined by the electric power generated by, the on-site valve can be monitored without requiring any external power supply.

  Embodiments of the present invention will be described below. FIG. 1 is a configuration diagram of an on-site valve monitoring apparatus according to an embodiment of the present invention. The on-site valve 11 rotates the handle 12 to change the stroke of the valve stem 13 to perform full opening and full closing operations. A disc 14 that rotates in conjunction with the handle 12 is attached to the valve stem 13 below the handle 12, and a slit is formed on the surface of the disc 14.

  In addition, the first piezoelectric sensor 16 a and the second piezoelectric sensor 16 b are held on a holding table 15 provided at a position facing the disk 14. The first piezoelectric sensor 16a is attached to the holding base 15 via an elastic body 17, and when the handle 12 is rotated and moved between the fully open position and the fully closed position, the first piezoelectric sensor 16a is It moves between the fully open position and the fully closed position in conjunction with the handle 12 via the disk 14.

  That is, when the elastic body 17 is fully extended, the first piezoelectric sensor 16 a is in the fully open position of the stroke of the valve rod 13 and is in contact with the disk 14. When the handle 12 is rotated in the fully closed direction from this state, the elastic body 17 is compressed by receiving a pressing force from the disk 14 while maintaining contact with the rotating disk 14, and the first piezoelectric sensor 16a is fully closed. Move in the direction. Conversely, the first piezoelectric sensor 16a moves in the fully open direction while the compression of the elastic body 17 is released in the fully open direction from the fully closed position. As a result, the first piezoelectric sensor 16a moves between the fully open position and the fully closed position while being vibrated by the slit of the disk 14.

  On the other hand, the second piezoelectric sensor 16 b is provided at the fully closed position of the stroke of the valve stem 13, and contacts the disk 14 at the fully closed position of the stroke of the valve stem 13. When the handle 12 of the on-site valve 11 is rotated at the fully closed position, vibration is given by the slit of the disk 14.

  In this way, the first piezoelectric sensor 16a and the second piezoelectric sensor 16b are installed so as to contact the disk 14 attached to the valve stem 13 at the maximum and minimum strokes of the valve stem 13, respectively. At that time, the field valve 11 is fully opened when the stroke of the valve stem 13 is maximum, and is fully closed when the stroke is minimum. When the handle 12 of the on-site valve 11 is rotated, the disk 14 fixed to the valve rod 13 is also rotated in association with the first piezoelectric sensor 16a or the second piezoelectric sensor 16b by the slit.

  The first piezoelectric sensor 16a and the second piezoelectric sensor 16b generate a weak current when vibration is applied. The open / close determination device 18 is generated by the first piezoelectric sensor 16a and the second piezoelectric sensor 16b. The power to be input is input, and the open / close state of the on-site valve is determined based on this power. The storage battery 19 stores the electric power generated by the first piezoelectric sensor 16a and the second piezoelectric sensor 16b, and is used as a drive power source for the open / close determination device 18, the wireless communication device 20, the storage device 21 and the like disposed in the field. Supply.

  The place where the on-site valve 11 is installed may not be able to use an external power supply, so the electric power generated by the first piezoelectric sensor 16a and the second piezoelectric sensor 16b is stored in the storage battery 19 and placed on-site. It is used as a drive power source for the open / close determination device 18, the wireless communication device 20, the storage device 21, and the like. For example, in the case of a rechargeable battery instead of the storage battery 19, it is necessary to replace it regularly, and it is difficult to determine the replacement time because the remaining amount of the rechargeable battery varies. On the other hand, it is conceivable to supply power using a solar cell, but in the case of a solar cell, the place where the on-site valve 11 is installed is not necessarily a bright place, and it is also necessary to ensure a sufficient amount of light for power generation. It is also difficult. Therefore, the storage battery 19 is charged with the electric power generated by the first piezoelectric sensor 16a and the second piezoelectric sensor 16b.

  The wireless communication device 20 transmits the open / close determination result of the open / close determination device 18 to the relay base station 22 by wireless communication, and the storage device 21 stores the on-site valve 11 such as the installation location and valve number of the on-site valve 11. Information is stored.

  The wireless communication device 20 is driven by the power stored in the storage battery 19 and transmits the open / close determination result of the open / close determination device 18 to the relay base station 22 by wireless communication. In this case, the wireless communication device 20 performs wireless communication using a different communication frequency for each on-site valve 11. This is to enable simultaneous communication of the open / close determination results from the plurality of on-site valves 11 provided on the site.

  In this manner, the opening / closing information of the on-site valve 11 obtained by the opening / closing determination device 18 is transmitted to the relay base station 22 by the wireless communication device 20 using wireless communication. Since the place where the field valve 11 is installed may be a place where a wire cannot be drawn, the wireless communication device 20 is used for the relay base station 22 where the opening / closing information of the field valve 11 obtained by the opening / closing determination device 18 is installed in the same room. And transmit. The opening / closing information received by the relay base station 22 is transmitted to the monitoring room by wire. Thereby, even when the site valve 11 is located away from the relay base station 22, the open / closed state of the site valve can be transmitted. Note that a wireless communication system such as a wireless LAN or specific low power may be used.

  In order to be able to detect the open / closed state of a plurality of on-site valves 11 at the same time, in wireless communication by the wireless communication device 20, communication is performed with a plurality of objects by changing the communication frequency in a limited area. Therefore, in the embodiment of the present invention, even when a plurality of on-site valves 11 are installed in the same room, simultaneous communication with a plurality of on-site valves is performed by setting different communication frequencies. .

  Here, the storage device 21 stores information such as the installation location and valve number of the on-site valve 11 and the current open / closed state. Each on-site valve 11 has a valve number, and an instruction to open or close the on-site valve to an inspector or an operator is performed using the valve number. Therefore, information such as the valve number is stored in the storage device 21, and when the open / close state of the on-site valve 11 is transmitted by wireless communication, the valve number stored in the storage device 21 is also transmitted. .

  Next, an opening / closing state display device 23 is provided at the site, and the opening / closing determination result of the opening / closing determination device 18 is displayed. For example, the open / close state display device 23 includes a display unit and a button. When the current open / close state of the on-site valve 11 is displayed, the open / close state of the on-site valve 11 is displayed on the display unit by pressing the button. . Although it is difficult to visually determine the current open / closed state of the on-site valve, in the embodiment of the present invention, the current open / closed state is stored in the storage device 21, and is displayed using that information. In addition, it is displayed only when the button is pressed to suppress power consumption. In addition, by reading the open / close state stored in the storage device 21, the current open / close state can be confirmed on site. Note that a device such as a RAM may be used as the storage device 21.

  Next, the determination process of the open / close determination device 18 will be described. FIG. 2 is a flowchart showing the determination processing contents of the open / close determination device 18. First, it is determined whether or not the first piezoelectric sensor 16a is in a power generation state (S11). In the power generation state, vibration is applied to the first piezoelectric sensor 16a by the slit of the disk 14, and the handle 12 is being operated.

  Therefore, when the first piezoelectric sensor 16a is generating power, the second piezoelectric sensor 16b determines whether or not it is in a power generation state (S12). When both the first piezoelectric sensor 16a and the second piezoelectric sensor 16b are in the power generation state, the handle 12 has reached the fully closed position, so that the fully closed information is transmitted to the wireless communication device 20 and the storage device 21. (S13). On the other hand, when only the first piezoelectric sensor 16a is in the power generation state, it is determined that the opening / closing operation is being performed (S14), and it is determined whether or not the first piezoelectric sensor 16a has stopped generating power (S15). When the first piezoelectric sensor 16a stops power generation from the power generation state, the handle 12 has reached the fully open position, and therefore the fully open information is transmitted to the wireless communication device 20 and the storage device 21 (S16). Thereby, the open / close determination device 18 can detect the open / closed state of the on-site valve 11.

  According to the embodiment of the present invention, the opening / closing state of the on-site valve 11 is detected by the first piezoelectric sensor 16a and the second piezoelectric sensor 16b, and at the opening / closing operation, the first piezoelectric sensor 16a and the second piezoelectric sensor 16b are used. The generated power is charged in the storage battery 19, and the open / close determination device 18 and the wireless communication device 20 are driven using the power to transmit the open / close information to the indoor relay base station 22. This makes it possible to detect the open / closed state of the on-site valve 11 without using any external power supply.

The block diagram of the on-site valve monitoring apparatus concerning embodiment of this invention. The flowchart which shows the determination processing content of the opening / closing determination apparatus in embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Site valve, 12 ... Handle, 13 ... Valve rod, 14 ... Disk, 15 ... Holding stand, 16 ... Piezoelectric sensor, 17 ... Elastic body, 18 ... Opening / closing judgment device, 19 ... Storage battery, 20 ... Wireless communication device, 21 ... Storage device, 22 ... Relay base station, 23 ... Open / close state display device

Claims (6)

A disk with a slit on the surface that rotates in conjunction with the handle of the field valve installed on the site, and the disk valve contacts with the disk at the fully open position of the stroke of the valve stem. A first piezoelectric sensor that moves between a fully open position and a fully closed position while being vibrated by the slit of the disk when rotated between the disk and the disk at the fully closed position of the valve stem stroke. When the handle of the field valve is rotated in the fully closed position, the second piezoelectric sensor that is vibrated by the slit of the disk, and the electric power generated by the first piezoelectric sensor and the second piezoelectric sensor An on-site valve monitoring device comprising: an open / close determination device for determining an open / close state of the on-site valve based on the opening / closing determination device. The on-site valve monitoring apparatus according to claim 1, further comprising a storage battery that stores electric power generated by the first piezoelectric sensor and the second piezoelectric sensor. The field valve monitoring according to claim 2, further comprising: a wireless communication device that is driven by electric power stored in the storage battery and transmits an open / close determination result of the open / close determination device to a relay base station by wireless communication. apparatus. The on-site valve monitoring device according to claim 3, wherein the wireless communication device performs wireless communication using a different communication frequency for each on-site valve. The on-site valve monitoring device according to any one of claims 1 to 4, further comprising a storage device for storing on-site valve information such as an on-site valve installation location and a valve number. The on-site valve monitoring device according to any one of claims 1 to 4, further comprising an open / close state display device that displays an open / close determination result of the open / close determination device.

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