JP2012047319A - Device for detecting valve opening and closing state - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily mount and dismount an manual valve without disassembling the same.SOLUTION: A device for detecting a valve opening and closing state has a displacement unit abutting on a valve rod of the manual valve moving by the rotation of a handle from the outside and changing the position with the movement of the valve rod, a detection unit for detecting the position change of the displacement unit, and a determination unit for determining at least one state of the opening state and the closing state of the valve element of the manual valve according to the detected position change of the displacement unit.

Description

  The present invention relates to a valve opening / closing state detection device that detects a valve opening / closing state of a manual valve.

  Generally, a manual valve installed in a nuclear power plant or a chemical plant performs an opening / closing operation for the purpose of isolating a flow path for inspection and repair of devices, equipment, specific areas, and the like. In such a manual valve, it is necessary to constantly monitor the opening / closing state as it should be, to monitor the maintenance of the planned state, and to ensure safety, and it is different from the opening / closing state as it should be. It is important to minimize accidents by detecting changes to conditions and taking early measures.

  Therefore, a ring member that concentrically surrounds the periphery of the handle shaft is fixed integrally to the handle shaft, and a plurality of objects to be detected such as permanent magnets interlocking with the opening / closing operation of the manual valve are attached to the ring member. In addition to being arranged at equal intervals in the direction, a sensor for detecting the movement of the object to be detected is provided on the pipe side in a different position in the rotation direction of the ring member so that the open / closed state of the valve can be detected. Manual open / close valves have been proposed (see, for example, Patent Document 1).

JP-A-8-285130

  However, since the above-described prior art is equipped with a detection device for disassembling the handle or the valve body and detecting the valve opening / closing state, it requires specialized knowledge relating to the manual valve, and the user can easily detect the detection device. There is a problem that cannot be attached or removed.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a valve open / closed state detection device that can be easily attached and detached without disassembling a manual valve.

  In order to solve the above problems, a valve opening / closing state detection device of the present invention includes a transition portion that abuts from the outside on a valve stem of a manual valve that moves by rotation of a handle, and that changes position as the valve stem moves. A detection unit that detects a change in the position of the shift unit; and a determination unit that determines at least one of an open state and a closed state of the valve body of the manual valve according to the detected change in the position of the shift unit. It is characterized by comprising.

  According to the present invention, the manual valve can be easily attached and detached without disassembling.

It is a figure which shows the structure of the valve opening / closing state detection apparatus which concerns on one Embodiment of this invention. It is a figure which shows the structure of the valve opening / closing state detection apparatus which concerns on 2nd Embodiment. It is a figure which shows the structure of the valve opening / closing state detection apparatus which concerns on 3rd Embodiment. It is a figure which shows the structure of the valve opening / closing state detection apparatus which concerns on 4th Embodiment. It is a figure which shows the structure of the valve opening / closing state detection apparatus which concerns on 5th Embodiment. It is a figure which shows the structure of the valve opening / closing state detection apparatus which concerns on 6th Embodiment. It is a figure which shows the structure of the valve opening / closing state detection apparatus which concerns on 7th Embodiment.

(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a valve open / closed state detection device 20 according to an embodiment of the present invention.

  As shown in FIG. 1, the manual valve 10 in this embodiment includes, for example, a manual ball valve, and includes a valve rod 11 that is orthogonal to a pipe (not shown) through which fluid flows. The valve stem 11 is supported by a yoke 12 so as to be able to be lifted and lowered. A ring-shaped handle 13 is fixed to the upper end of the valve stem 11, and the valve stem 11 rotates the handle 13 so that a valve body (not shown) fixed at the tip is placed in the pipe. Open and close with. In this embodiment, the handle 13 is formed integrally with the valve stem 11, and when the handle 13 is rotated in the direction in which the valve stem 11 is raised, the valve body is opened and the valve stem 11 is lowered. When the valve is rotated, the valve body is closed.

  The valve open / closed state detection device 20 is bent so that one end 21a is horizontal and the other end 21b is vertical, and moves up and down in conjunction with the valve stem 11; A coil spring 22 that presses and contacts one end 21a against the lower surface of the handle, detection switches 23 and 24 that detect a change in the position of the other end 21b of the arm portion 21 that moves up and down, and a holding member in which the detection switches 23 and 24 are disposed. 25 and a fixing jig 26 to which the holding member 25 is integrally fixed. Further, in addition to these basic configurations, the valve open / closed state detection device 20 receives a state signal by wirelessly transmitting a state signal indicating a change in position detected by the detection switches 23 and 24, and receives the state signal. And a management device 30 that manages the open / close state.

  The arm portion 21 is bent at two locations, the first and second bending points 21c and 21d, and is composed of three straight portions including one end 21a and the other end 21b. The shaft on the other end 21 b side of the arm portion 21 bent at the first bending point 21 c is slidably supported by the holding member 25. One end 21a of the arm portion 21 is formed to be bifurcated so that the valve rod 11 can be sandwiched between the one end 21a and the second bending point 21d, and is opposed to the arm portion 21 of the handle 13 by being pressed by the coil spring 22. Abutting the surface 13a.

  The other end 21b of the arm portion 21 is formed in a disk shape having a diameter larger than the diameter of the arm member 21, and the detection switch 23 corresponding to the fully open position and the fully closed position of the valve body with the valve rod 11 moving up and down. And 24. The arm portion 21 moves up and down by the rotation of the handle 13, contacts the valve stem 11 of the manual valve 10 from the outside, and functions as a transition portion that changes its position as the valve stem 11 moves.

  The coil spring 22 is inserted between the upper surface of the holding member 25 and the first bending point 21c, and presses the arm portion 21 toward the handle 13 side. Thereby, the one end 21a of the arm part 21 can always be in contact with the upper end of the valve stem 11 to which the handle 13 is fixed. Further, when the handle 13 is lowered, the coil spring 22 is pushed down toward the holding member 25 by the arm portion 21 interlocked therewith. The coil spring 22 functions as an elastic body that presses the transition portion so that the transition portion is separated from the holding portion and contacts the handle 13.

  The detection switch 23 detects the open state of the valve body, in this embodiment, the disk-shaped position of the other end 21b of the arm portion 21 corresponding to the fully open position, and the detection switch 24 indicates the closed state of the valve body. In the embodiment, the disk-shaped position of the other end 21b of the arm portion 21 corresponding to the fully closed position is detected. The detection switch 23 is disposed at a predetermined position of the holding member 25, that is, a position of the side surface of the side plate 25a of the holding member 25 corresponding to the fully opened position of the valve body, and the other end 21b of the rising arm portion 21 contacts. The detection switch 24 is disposed at a predetermined position of the holding member 25, that is, a position of the side surface of the side plate 25a of the holding member 25 corresponding to the fully closed position of the valve body, and the other end 21b of the descending arm portion 21 contacts. . The detection switches 23 and 24 are composed of, for example, microswitches, and when the other end 21b of the arm portion 21 comes into contact, the detection switches 23 and 24 are in an electrically conductive on state and output a state signal indicating the on state. When released, it goes off. The detection switches 23 and 24 function as a detection unit that detects a change in the position of the transition unit.

  The holding member 25 is configured by integrally fixing a side plate 25a and an upper plate 25b so as to form a substantially inverted L shape on the upper side of the side plate 25a. On one side surface of the side plate 25a, detection switches 23 and 24 are arranged at predetermined intervals in the vertical direction. The other end 21b of the arm portion 21 is penetrated through a through hole provided in a direction perpendicular to the upper plate 25b. With this configuration, the other end 21 b of the arm portion 21 can be moved up and down along a line connecting the detection switches 23 and 24. One end of a coil spring 22 interposed between the upper surface of the upper plate 25b and the first bending point 21c is engaged.

  The fixing jig 26 has a substantially C-shape that can be fitted to the yoke 12 from the lateral direction. The holding member 25 is disposed on one outer surface of the substantially C-shape, and the other end 21b of the arm portion 21 is vertical. Fix to be. The fixing jig 26 is detachably fitted to the yoke from the lateral direction, and is positioned and fixed at a predetermined position of the yoke 12 with, for example, screws. A wireless communication unit 27 is attached to the outer surface of the fixing jig 26. The fixing jig 26 may be always screwed to the yoke 12 or may be screwed to the yoke 12 only when it is necessary to detect the open / closed state of the valve body. The holding member 25 and the fixing jig 26 are detachably disposed on a support member that supports the valve stem 11 of the manual valve 10 and function as a holding unit that holds the detection unit.

  The wireless communication unit 27 is wired to the detection switches 23 and 24 and is wirelessly connected to the management device 30. The wireless communication unit 27 wirelessly transmits a state signal indicating the ON state from the detection switches 23 and 24 to the management device 30. The wireless communication unit 27 wirelessly communicates the position change of the transition unit detected by the detection unit to the determination unit.

  The management device 30 receives the state signal from the wireless communication unit 27, and determines whether the valve body of the manual valve 10 is open or closed according to the state signal. The management device 30 is provided separately from the manual valves 10, receives a plurality of state signals indicating the open state or the closed state of the plurality of manual valves 10 installed in the same plant, and opens / closes each manual valve 10. Discriminating and managing. The management device 30 functions as a determination unit that determines the open state and the closed state of the valve body of the manual valve 10 according to the detected position change of the shift unit.

Hereinafter, the operation of the valve opening / closing state detection device 20 will be described with reference to FIG.
When the valve opening / closing state detection device 20 is attached to the manual valve 10 in a closed state, for example, the coil spring 22 is compressed and the valve rod 11 is sandwiched between the forked portions of the one end 21a of the arm portion 21, and the upper surface of the handle 13 is Make contact with the bottom. Next, the fixing jig 26 is screwed and fixed to a screw hole provided at a predetermined position of the yoke 12.

At this time, the fixing position of the fixing jig 26 is adjusted so that the disk shape of the other end 21 b of the arm portion 21 is a position where the detection switch 24 is pressed.
It should be noted that the detection switches 23 and 24 can be mounted so as to be movable in the vertical direction, or the fixing jig 26 can be mounted in case the relative position between the other end 21b of the arm portion 21 and the detection switches 23 and 24 is finely adjusted. A plurality of screw holes are formed in the vertical direction of the side surface, and the relative position between the other end 21b of the arm portion 21 and the detection switches 23 and 24 is finely adjusted by adjusting the screw fixing position by selecting the screw hole. can do.

  Next, by rotating the handle 13 to the right, for example, when the valve stem 11 is raised, the valve body is opened, and the arm portion 21 is pushed by the coil spring 22 and is raised accordingly. Due to this rise, the other end 21 b of the arm portion 21 reaches the position of the detection switch 23 and presses the detection switch 23. Thereby, the detection switch 23 outputs a state signal indicating the ON state to the wireless communication unit 27.

When the state signal is input from the detection switch 23, the wireless communication unit 27 wirelessly transmits this state signal to the management device 30.
When receiving the state signal from the wireless communication unit 27, the management device 30 determines whether the valve body of the manual valve 10 is open or closed according to the state signal. Here, since the state signal is detected by the detection switch 23, the management device 30 determines that the valve body of the manual valve 10 is in the open state, and records and manages this.

  Further, when the valve rod 11 is lowered by rotating the handle 13 counterclockwise, for example, the arm portion 21 is lowered against the pressing force of the coil spring 22. Due to this lowering, the other end 21 b of the arm portion 21 reaches the detection switch 24 and presses the detection switch 24. Thereby, the detection switch 24 outputs a state signal indicating the ON state to the wireless communication unit 27. The wireless communication unit 27 wirelessly transmits this status signal to the management device 30.

  When the received status signal is a status signal detected by the detection switch 24, the management device 30 determines that the valve body of the manual valve 10 is closed and records and manages this. The management device 30 can acquire and manage information on the open / closed states of the plurality of manual valves 10 installed in the plant by wirelessly communicating with the valve open / closed state detection device 20 attached to each manual valve 10. .

  In this embodiment, the management device 30 is provided with the function of a determination unit that determines the open / close state of the manual valve. However, the present invention is not limited to this. For example, the wireless communication unit is provided with the function of this determination unit. The valve opening / closing state signal may be wirelessly transmitted to the management device 30. In this case, the management device 30 has only a function of managing the received information on the open / close state of each manual valve.

  Further, as another configuration for finely adjusting the fixing positions of the detection switches 23 and 24, for example, the positions of the detection switches 23 and 24 in the ascending / descending direction of the other end 21b of the arm portion 21 are arranged on the side surface of the holding member 25, for example. It is also possible to provide an adjustable mounting mechanism. Thereby, the fixed position of the detection switches 23 and 24 can be finely adjusted according to the open position and the closed position of the valve body.

  As described above, the valve open / close state detection device 20 of this embodiment is detachably attached to the yoke 12 and fixed, and detects the position change of the arm portion 21 interlocked with the valve stem 11 to detect the valve of the manual valve 10. The open / closed state can be determined. As a result, it is possible to easily attach and detach the valve open / close state detection device 20 without disassembling the manual valve. As a result, the operation time for installing and removing the valve open / close state detection device 20 is reduced. For example, when the valve open / close state detection device 20 is attached to or removed from the manual valve 10 installed in the radiation control section, The amount can be reduced.

(Second Embodiment)
FIG. 2 is a diagram illustrating a configuration of the valve open / close state detection device 20 according to the second embodiment.
As shown in FIG. 2, the valve opening / closing state detection device 20 according to this embodiment is different from the first embodiment in that only the detection switch 24 is provided among the detection switches, and the other configuration is the same as that of the first embodiment. It is the same.

  That is, when the state of the valve body that should be the original of the manual valve 10 is closed, it may be only necessary to determine whether or not the valve body is closed. Therefore, the detection switch 23 is omitted and only the detection switch 24 is replaced. It arrange | positions in the holding member 25 according to the closed position of a valve body.

  Here, when the valve stem 11 is lowered by rotating the handle 13 counterclockwise, for example, the arm portion 21 is lowered by the pressing of the handle 13. Due to this lowering, the other end 21 b of the arm portion 21 contacts the detection switch 24, that is, presses the detection switch 24, so that the detection switch 24 outputs a state signal indicating an ON state to the wireless communication unit 27.

  The wireless communication unit 27 wirelessly transmits a state signal indicating the ON state from the detection switch 24 to the management device 30, and the management device 30 indicates that the valve body of the manual valve 10 is closed according to the received state signal. Determine that there is.

  As described above, according to the valve open / closed state detection device 20 of this embodiment, the same effect as that of the first embodiment can be obtained, and since only a single detection switch is provided, the number of components can be reduced.

  In addition, when the state of the original valve body of the manual valve 10 is an open state, it may be only necessary to determine whether or not the valve body is in an open state. Therefore, the detection switch 24 is omitted and only the detection switch 23 is replaced. It is also possible to arrange it on the holding member 25. Also in this case, the same effects as those of the second embodiment can be obtained.

(Third embodiment)
FIG. 3 is a diagram illustrating a configuration of the valve open / close state detection device according to the third embodiment.
As shown in FIG. 3, in this embodiment, a potentiometer 29 disposed on the side surface of the holding member 25 and a power source (not shown) are provided as a detection unit for detecting the position of the valve stem 11 to constitute an electric circuit. Furthermore, a current flows through the electric circuit in a state where the other end 21 b of the arm portion 21 is an electrical contact and is in contact with the potentiometer 29. Then, the other end 21b of the arm portion 21 slides corresponding to the raising and lowering of the valve rod 11, so that the voltage value of the electric circuit changes. Therefore, the voltage value is measured, and the valve corresponding to the current value is measured. It enables detection of the opening degree of the body, for example, the opening state of 0 to 100%.

  Here, when the valve stem 11 is lifted by rotating the handle 13 to the right, for example, the arm portion 21 is lifted by the pressing of the coil spring 22. Due to this rise, the other end 21 b of the arm portion 21 comes into contact with the potentiometer 29, that is, rises and slides while being pressed by the potentiometer 29. Further, when the valve stem 11 is lowered by rotating the handle to the left, for example, the arm portion 21 is lowered. By this lowering, the other end 21 b of the arm portion 21 is lowered and slides while being pressed by the potentiometer 29. A voltage signal that changes according to the slide is output to the wireless communication unit 27.

  The wireless communication unit 27 wirelessly transmits a voltage signal from the potentiometer 29 to the management device 30, and the management device 30 determines the opening state of the valve body of the manual valve 10 according to the received voltage signal.

  As described above, according to the valve open / close state detection device 20 of this embodiment, the same effect as that of the first embodiment can be obtained, and the opening degree of the valve body of the manual valve 10 according to the voltage signal changed by the potentiometer 29. Since the state can be determined, the open / close state of the manual valve 10 can be easily determined from the opening state.

(Fourth embodiment)
FIG. 4 is a diagram illustrating a configuration of a valve open / closed state detection device 60 according to the fourth embodiment.
As shown in FIG. 4, the manual valve 50 includes a valve rod 51 that is orthogonal to a pipe (not shown) through which fluid flows. This valve stem 51 is supported so as to be able to move up and down by screwing into the yoke 52. The handle 53 is rotatably disposed at a predetermined position on the yoke 52 by a holding nut 54. The valve stem 51 rotates the handle 53 to open and close a valve body (not shown) fixed at the tip in the pipe. In this embodiment, the valve stem 51 and the handle 53 are formed separately, and when the handle 53 is rotated in the direction in which the valve stem 51 rises, only the valve stem 51 rises to open the valve disc. . When the handle 53 is rotated in the direction in which the valve stem 11 is lowered, only the valve stem 51 is lowered and the valve body is closed.

  The valve open / closed state detection device 60 detects a change in position of the transition portion 61 provided on the valve stem 51, the holding portion 62 placed on the handle 53, and the transition portion 61 that moves up and down in conjunction with the valve stem 51. A protective cover portion 65 that covers the switches 63 and 64, the transition portion 61, and the holding portion 62 is provided. Furthermore, the valve opening / closing state detection device 60 includes a wireless communication unit 66 and a management device 68 as in the first embodiment.

  The transition part 61 is formed in a disc shape and is provided concentrically with, for example, the upper end of the valve stem 51. The shift portion 61 moves up and down in conjunction with the valve stem 11 to change the position, and enables contact with the detection switches 63 and 64 disposed in the holding portion 62.

The holding unit 62 includes a pedestal 62 a and a holding body 62 b and is detachably mounted on the handle 53.
The pedestal 62 a is formed in a hollow disk shape, is fitted on the outer peripheral surface of the presser nut 54, and is detachably mounted on the handle 53. The pedestal 62a is positioned and fixed to the holding nut 54 with screws or the like, for example.

  The holding body 62b has two bridge piers 62b1 and 62b2 fixed to the pedestal 62a, and a bridge 62b3 bridged by the bridge piers 62b1 and 62b2. Detection switches 63 and 64 are held on the side facing the. The bridge piers 62b1 and 62b2 are formed in such a length that the transition part 61 does not come into contact with the bridge part 62b3 even when the valve stem 51 is raised to the maximum.

  The detection switch 63 detects the position of the transition portion 61 corresponding to the open state of the valve body, in this embodiment, the fully open position, and the detection switch 24 corresponds to the closed state of the valve body, in this embodiment, the fully closed position. The position of the transition part 61 is detected. The detection switch 63 is disposed at a predetermined position of the one pier part 62b1, that is, a position of the side surface of the pier part 62a1 corresponding to the fully open position of the valve body, and the rising transition part 61 contacts. The detection switch 64 is disposed at a predetermined position of the pier part 62b1, that is, a position on the side surface of the pier part 62a1 corresponding to the fully closed position of the valve body (side closer to the handle 53 than the detection switch 63) and descends. The transition part 61 contacts. The detection switches 63 and 64 are configured by microswitches, for example, like the detection switches 23 and 24 of the first embodiment. When the transition portion 61 comes into contact, the detection switches 63 and 64 are brought into an electrically conductive on state. When released, it goes off. The detection switches 63 and 64 function as a detection unit that detects a change in the position of the transition unit.

  The protective cover portion 65 is formed in a hollow cylindrical shape that covers the transition portion 61 and the holding portion 62, and is detachably mounted on the handle 53. The lower end of the protective cover portion 65 is fitted to the outer peripheral surface of the pedestal 62a, and is fixed to the pedestal 62a with screws or the like, for example.

  The wireless communication unit 66 is formed in a disc shape having the same diameter as the outer diameter of the protective cover unit 65, and is arranged and fixed on the upper end of the protective cover unit 65. Similar to the wireless communication unit 27 of the first embodiment, the wireless communication unit 66 is wired to the detection switches 63 and 64 and is wirelessly connected to the management device 68. The wireless communication unit 66 wirelessly transmits a state signal indicating the ON state from the detection switches 63 and 64 to the management device 68. The wireless communication unit 66 has a function of wirelessly communicating the change in position of the transition unit detected by the detection unit to the determination unit.

  Similar to the management device 30 of the first embodiment, the management device 68 receives the state signal from the wireless communication unit 66 and determines whether the valve body of the manual valve 50 is open or closed according to this state signal. This management device 68 is provided separately from the manual valve 50, and receives a plurality of state signals indicating the open state or the closed state of a plurality of manual valves 50 installed in the same plant, and the open / close state of each manual valve 50 is received. Are discriminated and managed. The management device 68 functions as a determination unit that determines the open state and the closed state of the valve body in accordance with the detected position change of the shift unit 61.

Hereinafter, the operation of the valve opening / closing state detection device 60 will be described with reference to FIG.
In this valve open / closed state detection device 60, for example, when attached to the closed manual valve 50, the transition portion 61 is fitted to the upper end of the valve rod 51 and the holding portion 62 is disposed on the handle 53. Next, the fixing jig 26 is screwed and fixed to a screw hole provided at a predetermined position of the holding nut 54.

At this time, the fixing position of the detection switch 24 is adjusted so that the disc shape of the transition portion 61 is a position where the detection switch 64 is pressed.
In this embodiment, the relative positions of the transition portion 61 and the detection switches 63 and 64 can be finely adjusted by attaching the detection switches 23 and 24 so as to be movable in the vertical direction.

  Next, when the valve rod 51 is raised by rotating the handle 53 to the right, for example, the valve body is opened. Due to this rise, the transition part 61 reaches the position of the detection switch 63 and presses the detection switch 63. Thereby, the detection switch 63 outputs a state signal indicating the ON state to the wireless communication unit 66. The wireless communication unit 66 wirelessly transmits this status signal to the management device 68.

  When the received status signal is a status signal detected by the detection switch 63, the management device 68 determines that the valve body of the manual valve 50 is closed, and records and manages this.

  Further, when the valve rod 51 is lowered by rotating the handle 53 counterclockwise, for example, the valve body is closed. Due to this lowering, the transition part 61 reaches the position of the detection switch 64 and presses the detection switch 64. As a result, the detection switch 64 outputs a state signal indicating the ON state to the wireless communication unit 66. The wireless communication unit 66 wirelessly transmits this status signal to the management device 68.

  When the received status signal is a status signal detected by the detection switch 64, the management device 68 determines that the valve body of the manual valve 50 is closed, and records and manages this. The management device 68 can acquire and manage the open / close states of the plurality of manual valves 50 installed in the plant by wireless communication with the valve open / close state detection devices 60 attached to the manual valves 50.

  As described above, the valve open / close state detection device 60 of this embodiment is detachably mounted on the handle 53 and fixed, and detects a change in the position of the transition portion 61 interlocked with the valve stem 51 to detect the manual valve 50. The valve opening / closing state can be determined. As a result, it is possible to easily attach and remove the valve opening / closing state detection device 60 without disassembling the manual valve. As a result, the operation time for attaching and removing the valve open / close state detection device 60 is reduced. For example, when the valve open / close state detection device 60 is attached to or detached from the manual valve 50 installed in the radiation control section, The amount can be reduced.

(Fifth embodiment)
FIG. 5 is a diagram illustrating a configuration of a valve open / closed state detection device according to a fifth embodiment.
As shown in FIG. 5, the valve open / close state detection device 60 according to this embodiment is different from the fourth embodiment in that only the detection switch 64 is provided among the detection switches, and the other configuration is the same as that of the fourth embodiment. It is the same. In this embodiment, when the state of the original valve body of the manual valve 50 is closed, it is determined whether or not the valve body is closed.

  Here, when the valve stem 51 is lowered by rotation of the handle 53, for example, left rotation, the transition portion 61 is lowered in conjunction with it. Due to this lowering, the transition unit 61 contacts the detection switch 64, that is, presses the detection switch 64, so that the detection switch 64 outputs a state signal indicating the ON state to the wireless communication unit 66.

  The wireless communication unit 66 wirelessly transmits a state signal indicating the ON state from the detection switch 64 to the management device 68, and the management device 68 indicates that the valve body of the manual valve 50 is closed according to the received state signal. Determine that there is.

  As described above, according to the valve open / closed state detection device 60 of this embodiment, the same effect as that of the fourth embodiment can be obtained, and since only a single detection switch is provided, the number of parts can be reduced.

  In addition, when the state of the original valve body of the manual valve 50 is an open state, it may be only necessary to determine whether or not the valve body is in an open state. Therefore, the detection switch 64 is omitted, and only the detection switch 63 is replaced. It is also possible to arrange in the holding part 62. In this case, the same effect as that of the fourth embodiment can be obtained.

(Sixth embodiment)
FIG. 6 is a diagram illustrating a configuration of the valve open / close state detection device according to the sixth embodiment.
As shown in FIG. 6, in this embodiment, a potentiometer 67 disposed on the side surface of the holding unit 62 and a power source (not shown) are provided as a detection unit for detecting the position of the valve stem 51 to constitute an electric circuit. Furthermore, a current flows through the electric circuit in a state where the transition 61 is an electrical contact and abuts against the potentiometer 67. Then, since the voltage value of the electric circuit changes as the transition portion 61 slides corresponding to the raising / lowering of the valve rod 51, the voltage value is measured, and the opening of the valve body corresponding to the current value is measured. For example, it is possible to detect an opening state of 0 to 100%.

  Here, when the valve stem 51 is lifted by rotating the handle 53 to the right, for example, the shift portion 61 contacts the potentiometer 67, that is, slides upward while being pressed by the potentiometer 67. A voltage signal that changes due to the slide is output to the wireless communication unit 66.

  The wireless communication unit 66 wirelessly transmits the voltage signal from the potentiometer 67 to the management device 68, and the management device 68 determines the opening state of the valve body of the manual valve 50 according to the received voltage signal.

  As described above, according to the valve open / closed state detection device 60 of this embodiment, the same effect as that of the fourth embodiment is obtained, and the opening degree of the valve body of the manual valve 50 according to the voltage signal changed by the potentiometer 67. Since the state can be determined, the open / close state of the manual valve 50 can be easily determined from the opening state.

(Seventh embodiment)
FIG. 7 is a diagram illustrating a configuration of a valve open / closed state detection device according to a seventh embodiment. Since the manual valve 50 has the same configuration as the manual valve of the fourth embodiment, the description thereof is omitted here.
As shown in FIG. 7, the valve open / closed state detection device 70 can slide the switch receiving plate 71 disposed on the presser nut 54, the holding jig 72 provided on the valve stem 51, and the holding jig 72. , A detection switch 74 and 75 for detecting a change in position of the holding jig 72 that moves up and down, and a spring spring 76 that presses the support bar 73. Further, the valve open / close state detection device 70 wirelessly transmits a state signal indicating a position change detected by the detection switches 74 and 75, and a management device that receives the state signal and manages the open / close state of the valve body. 80.

  The switch receiving plate 71 is formed in a disc shape. A central portion of the switch receiving plate 71 is inserted into the valve stem 51 and is detachably disposed on the presser nut 54. The switch receiving plate 71 is fixed to the upper surface of a pressing nut 54 for pressing the handle 53, for example, by screwing.

  The holding jig 72 is formed in a disc shape and is provided concentrically with the upper end of the valve stem 51. The holding jig 72 changes its position by moving up and down in conjunction with the valve stem 51, and enables contact with the detection switch 74 and contact between the switch receiving plate 71 and the detection switch 75. The holding jig 72 has a hole 72a that penetrates the upper surface 72b and the lower surface 72c. That is, the holding jig 72 has a hole 72 a and is provided in the valve stem 51, and has a function of a transition portion that moves as the valve stem 51 moves.

  The support rod 73 is inserted into the hole 72a of the holding jig 72 and is slidably supported. A detection switch 74 is attached to the support rod 73 at the upper end. For example, the support rod 73 is lowered by the weight of the holding spring 72 corresponding to the fully opened state of the valve body due to its own weight and the spring spring 76 being pressed, and the holding jig 72 and the detection switch 74 are Enable contact. When the valve stem 51 is lowered, the lower end of the support rod 73 comes into contact with the switch receiving plate 71, and the support rod 73 is prevented from descending. On the other hand, since the valve stem 51 continues to descend to the lowered position corresponding to the fully closed state of the valve body, the holding jig 72 and the detection switch 74 are separated from each other. Further, when the valve rod 51 is raised, the support rod 73 maintains a contact state between the lower end and the switch receiving plate 71, and the support position with the holding jig 72 is changed upward, and the holding jig 72 is detected. The contact of the switch 74 is made possible. That is, the support rod 73 has a function of penetrating through the hole 72a and slidably supported by the hole 72a and having one end abutting against the handle receiving plate 71.

  The detection switch 74 detects the position of the valve stem 51 corresponding to the open state of the valve body, in this embodiment, the fully open state. As described above, the detection switch 74 is disposed at the upper end of the support rod 73, that is, at the upper end position of the support rod 73 corresponding to the fully open position of the valve body, and is in contact with the upper surface of the holding jig 72 so as to be separated. . The detection switch 74 functions as a first detection unit that detects a relative position change between the transition unit and the support rod 51.

  The detection switch 75 detects a change in the position of the holding jig 72 corresponding to the closed state of the valve body, in this embodiment, the fully closed state. The detection switch 75 is attached to the lower surface 72 b of the holding jig 72 and moves up and down in conjunction with the raising and lowering of the valve stem 51. The detection switch 75 is lowered in conjunction with the valve stem 51. When the valve stem 51 reaches a position corresponding to the fully closed position of the valve body, the detection switch 75 comes into contact with the switch receiving plate 71. The detection switch 75 is disposed on a surface 72c facing the handle 53, and moves with the movement of the valve stem 51, and detects a relative position change between the shift portion and the handle 53. Function as.

  Like the detection switches 23 and 24 of the first embodiment, the detection switches 74 and 75 are constituted by, for example, microswitches. When the detection switches 74 and 75 come into contact with the holding jig 72 and the switch receiving plate 71, the detection switches 74 and 75 are in an electrically conductive on state. When this contact is released, the state is turned off.

  The fire spring 76 has a spring end and is configured by winding a steel wire like a coil. The spring spring 76 is disposed at the upper end of the support rod 73, and the spring end is connected to the upper surface of the holding jig 72. The spring spring 76 presses the support bar 73 toward the handle 53 side, and prevents the support bar 73 from being detached from the hole 72a of the holding jig 72. The spring spring 76 has one end connected to the transition portion, the other end connected to the other end of the support rod 73, and the support rod 73 so that one end of the support rod 73 contacts the switch receiving plate 71. It functions as an elastic body that presses 73. Note that instead of the spring spring 76, a coil spring is used to connect one end to the upper surface of the holding jig 72 and the other end to the upper end of the support bar 73, and press the support bar 73 toward the handle 53 side. Is also possible.

  The wireless communication unit 77 is disposed on the upper surface of the holding jig 72, is wired to the detection switches 74 and 75, and is wirelessly connected to the management device 80. The wireless communication unit 77 wirelessly transmits a state signal indicating the ON state from the detection switches 74 and 75 to the management device 80. The wireless communication unit 77 has a function of wirelessly communicating the change in position of the transition unit detected by the detection unit to the determination unit.

  Similar to the management device 30 of the first embodiment, the management device 80 receives the state signal from the wireless communication unit 77 and determines whether the valve body of the manual valve 50 is open or closed according to this state signal. This management device 80 is provided separately from the manual valve 50, and receives a plurality of state signals indicating the open state or the closed state of the plurality of manual valves 50 installed in the same plant, and the open / close state of each manual valve 50 is received. Are discriminated and managed. The management device 80 functions as a determination unit that determines the open state and the closed state of the valve body in accordance with the detected position change of the transition unit.

Hereinafter, the operation of the valve opening / closing state detection device 70 will be described with reference to FIG.
In this valve open / closed state detection device 70, for example, when attached to the opened manual valve 50, the switch receiving plate 71 is fixed on the presser nut 54, and the support rod 73, the detection switches 74 and 75, the wireless communication unit 77, and the like. The holding jig 72 provided with is fitted and fixed to the upper end of the valve stem 51.

At this time, the fitting position of the holding jig 73 at the upper end of the valve rod 51 is adjusted so that the detection switch 74 contacts the holding jig 72 and the lower end of the support rod 73 contacts the switch receiving plate 71.
In this embodiment, the holding jig 73 is screwed onto the valve stem 51, and the relative position between the switch receiving plate 71 and the detection switches 74 and 75 is finely adjusted by adjusting the screwing position. be able to.

  Next, when the valve rod 51 is raised by rotating the handle 53 to the right, for example, the holding jig 72 is raised in conjunction with this. In response to this rise, the support rod 73 is restrained to the handle 53 side, so that the holding jig 72 approaches and contacts the detection switch 74 and presses the detection switch 74. Thereby, the detection switch 74 outputs a state signal indicating the ON state to the wireless communication unit 77. The wireless communication unit 77 wirelessly transmits this status signal to the management device 80.

  If the received status signal is a status signal detected by the detection switch 74, the management device 80 determines that the valve body of the manual valve 50 is closed, and records and manages this.

  When the valve rod 51 and the holding jig 72 are lowered by rotating the handle 53, for example, counterclockwise, the holding jig 72 is separated from the detection switch 74, and the switch receiving plate 71 contacts the detection switch 75. The detection switch 75 is pressed. By this pressing, the detection switch 75 outputs a state signal indicating the on state to the wireless communication unit 77. The wireless communication unit 77 wirelessly transmits this status signal to the management device 80.

  When the received status signal is a status signal detected by the detection switch 75, the management device 80 determines that the valve body of the manual valve 50 is in an open state, and records and manages this. The management device 80 can acquire and manage the open / closed states of the plurality of manual valves 50 installed in the plant by wirelessly communicating with the valve open / closed state detection devices 70 attached to the manual valves 50.

  Thus, the valve open / close state detection device 70 of this embodiment detects the position change of the holding jig 72 that is detachably fitted to the upper end of the valve stem 51 to determine the valve open / close state of the manual valve 50. can do. As a result, it is possible to easily attach and remove the valve open / close state detection device 70 without disassembling the manual valve. As a result, the operation time for attaching and removing the valve open / close state detection device 60 is reduced. For example, when the valve open / close state detection device 60 is attached to or detached from the manual valve 50 installed in the radiation control section, The amount can be reduced.

  In this embodiment, the switch receiving plate 71 is fixed on the presser nut 54 and the support rod 73 and the detection switch 75 can be brought into contact with the presser nut 54. However, the present invention is not limited to this. For example, the switch receiving plate 71 is eliminated, the length of the support rod 73 and the height of the detection switch 75 are changed and adjusted, and the support rod 73 and the detection switch 75 are configured to contact the handle 53, so It is also possible to detect a change in the position of the tool 72. In this case, the number of parts can be reduced, and attachment and removal operations can be further facilitated.

  Similarly to the second embodiment, it is possible to provide only one of the detection switches 74 or 75 according to the necessity of the open state or the closed state of the valve body. Also in this case, the same effects as those of the second embodiment can be obtained.

  In these embodiments, contact type detection switches are used. However, in the present invention, for example, a non-contact type detection switch using a laser beam or the like can be used.

  In addition, this invention is not limited only to the said embodiment, You may deform | transform a component in the range which does not deviate from the summary in an implementation stage. In addition, various inventions can be configured by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  DESCRIPTION OF SYMBOLS 10,50 ... Manual valve, 11,51 ... Valve rod, 12,52 ... Yoke, 13,53 ... Handle, 20,60,70 ... Valve opening / closing state detection device, 21 ... Arm part, 22 ... Coil spring, 23,24 , 63, 64, 74, 75 ... detection switch, 25 ... holding member, 26 ... fixing jig, 27, 66, 77 ... wireless communication unit, 29 ... potentiometer, 30, 68, 80 ... management device, 54 ... holding nut , 61 ... Transition section, 62 ... Holding section, 62a ... Pedestal, 62b ... Holding body, 62b1, 62b2 ... Bridge pier section, 62b3 ... Bridge section, 65 ... Protection cover section, 67 ... Potentiometer, 71 ... Switch receiving plate, 72 ... Holding jig, 72a ... hole, 73 ... support rod, 76 ... fire spring.

Claims (7)

A transition part that abuts from the outside on the valve stem of a manual valve that moves by the rotation of the handle, and changes its position as the valve stem moves;
A detection unit for detecting a change in position of the transition unit;
A discriminating unit for discriminating at least one of an open state and a closed state of the valve body of the manual valve in accordance with the detected position change of the transition unit;
A valve open / closed state detection device comprising: The handle moves in conjunction with the valve stem;
The valve opening / closing state detection device is:
A holding part that is detachably disposed on a support member that supports the valve stem of the manual valve, and holds the detection part;
An elastic body that presses the transition portion so as to separate the transition portion from the holding portion and contact the handle;
The valve open / closed state detection device according to claim 1, further comprising: The transition portion is disposed on the valve stem, and changes its position with the moving valve stem,
A holding unit that is detachably disposed on the handle and holds the detection unit;
The valve open / closed state detection device according to claim 1. The transition part has a hole and is disposed on the valve stem,
The valve opening / closing state detection device is:
A support rod that penetrates the hole and is slidably supported by the hole, and one end of which is in contact with the handle;
One end is connected to the transition portion, the other end is connected to the other end of the support rod, and an elastic body that presses the support rod so that one end of the support rod abuts the handle;
Further comprising
2. The valve open / closed state detection device according to claim 1, wherein the detection unit includes a first detection unit that detects a relative position change between the transition unit and the support rod. The transition portion has a surface facing the handle,
The detection unit further includes a second detection unit that is disposed on the surface, moves with the movement of the valve stem, and detects a relative position change of the transition unit and the handle. The valve open / closed state detection device according to claim 1 or 4. The first detection unit detects one of an open state or a closed state of the valve body of the manual valve according to the detected position change of the transition unit,
6. The valve opening / closing state according to claim 5, wherein the second detection unit detects the other of the open state or the closed state of the valve body of the manual valve in accordance with the detected position change of the transition unit. Detection device. A wireless communication unit that wirelessly communicates the position change of the transition unit detected by the detection unit to the determination unit;
The valve open / closed state detection apparatus according to claim 1, further comprising:

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