JP2020183679A - Closing device for nuclear power facility - Google Patents

Abstract

To enable holding an open state even if a large load is applied in a vertical direction, and to achieve a layout that allows a pressure inside a building to be easily released in an abnormal situation, in a case where a plurality of shielding doors are arranged close to each other.SOLUTION: A closing device 1 includes shafts 31c and 32c extending in a vertical direction provided between a shielding door 10 and a frame-type frame 20, and hinges 31 and 32 that support the shielding door 10 in a rotatable manner. A driving device 40 is provided at a side of the shielding door 10, in a lower position relative to a vertical direction center part of the shielding door 10.SELECTED DRAWING: Figure 5

Description

The present invention relates to a closing device provided in a nuclear power plant.

Conventionally, nuclear power generation facilities have been a reactor building in which a reactor pressure vessel is stored, a turbine building in which a turbine rotated by steam pumped from the reactor pressure vessel is stored, and an MS tunnel connecting the reactor building and the turbine building. It consists of rooms and the like. The MS tunnel chamber is also called the main steam pipe tunnel chamber (MSIV chamber).

In the reactor building and the MS tunnel room adjacent to it, it is conceivable that the internal pressure will rise significantly in the event of an abnormal situation such as when a steam pipe or the like bursts. Assuming the occurrence of such an abnormal situation, blows on the walls of the reactor building and MS tunnel room to release the internal pressure by pushing it out of the facility when the internal pressure rises abnormally. Safety devices such as an out panel (BOP) and a rupture disc that relieves internal pressure by bursting itself are installed.

If the blowout panel is left off due to the occurrence of an abnormal situation, radioactive substances in the building may continue to leak out of the facility. Therefore, for example, a closing device as disclosed in Patent Documents 1 to 3 It is considered that the opening is closed after the blowout panel is opened. The closing devices of Patent Documents 1 and 2 include a shielding door that can slide to a closed position so as to close the opening after the blowout panel is opened. Further, the closing device of Patent Document 3 includes a shielding door rotatably attached to the upper end of the frame body around a horizontal axis, and after the blowout panel is opened, the shielding door is actuated or the like. It is rotated to a closed position that closes the opening.

Japanese Patent No. 6430055 Japanese Patent No. 6494849 Japanese Patent No. 6494850

By the way, in the closing devices of Patent Documents 1 and 2, since the shielding door has a structure that slides in the horizontal direction, when it is applied to a place where blowout panels and rupture disks are densely packed, the shielding door in an open state at normal times is used. Will be positioned to block the adjacent opening, resulting in a smaller effective opening area, which can be an obstacle to relieving internal pressure in the event of an abnormal situation.

Therefore, as in Patent Document 3, a wide effective opening area can be secured by providing a shielding door that rotates around the horizontal axis so as not to block the adjacent opening when the door is normally open. Therefore, it is considered that the internal pressure is likely to escape when an abnormal situation occurs.

However, Patent Document 3 has a structure in which the shielding door at the time of opening is held in a state of being rotated upward. Then, the shielding door can be kept open even if a large earthquake directly underneath occurs, and the pressure can be released in the event of a sudden pressure rise in the building that may occur thereafter. Must be done. However, assuming the case of a large earthquake directly underneath, it is quite possible that a load that is several times larger than normal will act downward on the shield door, and under such circumstances the shield door will be It is extremely difficult to hold the door so that it does not rotate downward in consideration of the weight of the shielding door, and in the case of Patent Document 3, a large-scale drive device is required.

When the drive unit becomes large-scale, it becomes a problem to lay out the drive unit on the wall of the building so as not to interfere with the release of internal pressure when an abnormal situation occurs. In particular, when it is desired to provide a plurality of shielding doors close to each other, such as in a place where blowout panels and rupture disks are densely packed, the arrangement of the drive device becomes an even more remarkable problem.

The present invention has been made in view of this point, and an object of the present invention is to enable the shielding door to be held in an open state even when a large load is applied in the vertical direction, and to provide a plurality of shielding doors. The purpose of this is to make it possible to realize a layout in which the pressure inside the building can be easily released when an abnormal situation occurs when the components are arranged close to each other.

In order to achieve the above object, in the present invention, the shielding door is rotatably supported with respect to the support by a shaft extending in the vertical direction, and the driving device for driving the shielding door is vertically supported on the side of the shielding door. It is arranged below or above the center.

The first invention is a shielding device for a nuclear power generation facility that closes an opening formed in the wall when a blowout panel or a rupture disk is opened, which is provided on the wall constituting the nuclear power generation facility. It has a door, a support that supports the shielding door, and a shaft that is interposed between the shielding door and the support and extends in the vertical direction, and supports the shielding door rotatably around the shaft. A hinge for switching between a closed state for closing the opening and an open state for opening the opening is arranged on the side of the shielding door below or above the central portion in the vertical direction of the shielding door. It is characterized by including a driving device for driving the shielding door around the shaft.

According to this configuration, the shield door is rotatably supported by the support by the shaft, so that the opening located next to the shield door is not blocked when the shield door is normally open. A wide effective opening area is secured. Further, since the shaft supporting the shielding door extends in the vertical direction, the direction of the load is the axial direction even if a large load acts in the vertical direction. This makes it possible to hold the shielding door in an open state without forming a large-scale structure as compared with the case where it acts around the axis as in Patent Document 3. Therefore, the structure for holding the shielding door in the open state becomes compact, and it does not easily interfere with the release of internal pressure when an abnormal situation occurs.

In addition, when the blowout panel comes off or the rupture disk bursts due to the occurrence of an abnormal situation, the drive device can rotate the shielding door around the axis to close the door. As a result, it is possible to prevent radioactive substances and the like existing in the building from leaking out of the facility.

Further, it is conceivable to increase the total opening area by preparing a plurality of main closing devices and arranging them in close proximity to each other in the horizontal direction. In this case, if the drive device is located on the side of the shield door below the central portion in the vertical direction of the shield door, the drive device is placed upside down by flipping the closing device arranged next to the drive device. Is located on the side of the shielding door above the central portion in the vertical direction of the shielding door. Further, when the drive device is located on the side of the shield door above the central portion in the vertical direction of the shield door, the drive device can be moved upside down by turning the closing device arranged next to it upside down. It will be located on the side of the shielding door below the central part in the vertical direction of the shielding door. That is, in either case, since the drive devices of the adjacent closing devices can be arranged side by side in the vertical direction, the dead space is reduced and the effective opening area is widely secured. As a result, a layout that makes it easy to release the pressure inside the building when an abnormal situation occurs is realized.

The second invention includes an open side elastic member that exerts a repulsive force on the shield door in the open state in the closing direction, and a first lock device that locks the shield door in the open state. It is characterized by.

According to this configuration, when the shielding door is opened, the shielding door is locked by the first locking device. At this time, since the repulsive force acts on the shielding door in the closing direction by the elastic member on the open side, the shielding door is suppressed from shaking and rattling against rolling during an earthquake, for example.

The third invention includes a closing-side elastic member that exerts a repulsive force on the closed door in the opening direction, and a second locking device that locks the closed door. It is characterized by.

According to this configuration, when the shielding door is closed, the shielding door is locked by the second locking device. At this time, since the repulsive force acts on the shielding door in the opening direction by the elastic member on the closing side, the shielding door is suppressed from shaking and rattling against rolling when an earthquake occurs, for example.

In the fourth invention, the support is formed of a frame-shaped frame formed in a frame shape corresponding to the shielding door, and the closing-side elastic member is formed so as to extend along the frame-shaped frame. It is characterized in that it is a gasket interposed between the frame type frame and the shielding door.

According to this configuration, when the shielding door is closed, the closing side elastic member is pressed by the shielding door and the frame formwork and elastically deformed, and the closing side elastic member seals between the shielding door and the frame formwork. Will be done.

In a fifth aspect of the invention, the gasket is attached to one of the frame-shaped frame and the shielding door, and the other of the frame-shaped frame and the shielding door has a ridge portion that contacts an intermediate portion in the width direction of the gasket. Is provided so as to project toward one of the above.

According to this configuration, when the shielding door is closed, the ridge portion abuts on the intermediate portion in the width direction of the gasket, and the contact surface pressure increases.

In the sixth invention, the drive device includes a rotational force generator, a torque limiter to which the output of the rotational force generator is input, and a transmission member for transmitting the rotational force output from the torque limiter to the shaft. It is characterized by having.

According to this configuration, the output of the rotational force generator is input to the hinge shaft via the torque limiter and transmission member, thereby rotating the shielding door from the closed state to the open state and vice versa. Becomes possible. When the shielding door is closed or opened, the shielding door is pressed against other members to stop it. At this time, a torque limiter is placed between the rotational force generator and the shielding door. It is possible to prevent an overload from being applied to each part without performing special speed control. That is, the place where the closing device according to the present invention is installed is an environment in which precision equipment such as an inverter cannot be installed due to temperature, humidity, radioactivity, etc., and it is difficult to perform speed control, but a torque limiter is interposed. By doing so, it is possible to perform reliable operation even in such an environment.

Further, for example, when the shielding door tries to rotate around the axis due to rolling during an earthquake, an unreasonable force is applied to the drive device from the output side. At this time, a torque limiter is applied to each part. The force is reduced.

A seventh invention includes a first control device that controls the drive device and the first lock device that locks the shield door in the open state, and the first control device has the shield door in the open state. It is characterized in that the control for operating the drive device and the control for operating the first lock device after a lapse of a predetermined time after the shield door is opened are performed. ..

According to this configuration, the first lock device can be operated after a predetermined time has elapsed after the shield door is opened, so that the first lock device is operated after the shield door is surely opened. It will be.

The eighth invention includes a second control device that controls the drive device and the second lock device that locks the shield door in the closed state, and the second control device has the shield door closed. It is characterized in that the control for operating the drive device and the control for operating the second lock device after a lapse of a predetermined time after the shield door is closed are performed. ..

According to this configuration, the second lock device can be operated after a lapse of a predetermined time after the shield door is closed, so that the second lock device is operated after the shield door is surely closed. It will be.

A ninth aspect of the present invention is characterized in that the drive device includes an electric motor, a storage box for accommodating the electric motor, and a heat insulating material disposed inside the storage box.

According to this configuration, the electric motor can be protected from external heat by storing the electric motor in a storage box having heat insulating properties. As a result, it is not necessary to use a special motor, and a general-purpose motor can be used.

In a tenth invention, the drive device includes an output shaft protruding in the vertical direction, a drive sprocket fixed to the output shaft, a driven sprocket fixed to the shaft of the hinge, the drive sprocket, and the driven sprocket. It is characterized by having a transmission chain that is wound around a sprocket.

According to this configuration, since the output shaft protrudes in the vertical direction, the drive sprocket fixed to the output shaft and the driven sprocket fixed to the hinge shaft are shielded by a simple configuration in which the conduction chain is wound. It becomes possible to rotate the door.

According to the first invention, since the shielding door is rotatably supported around an axis extending in the vertical direction, the shielding door can be held in an open state even when a large load is applied in the vertical direction. Further, since the drive device for driving the shielding door around the axis is arranged on the side of the shielding door below or above the central portion in the vertical direction of the shielding door, a plurality of shielding doors are arranged close to each other. When installed, the drive devices can be arranged side by side in the vertical direction to reduce dead space. As a result, it is possible to realize a layout in which the pressure inside the building can be easily released when an abnormal situation occurs.

According to the second invention, the repulsive force can be applied in the closing direction by the elastic member on the open side while the shield door in the open state is locked. Therefore, for example, the shield door is subjected to rolling during an earthquake. The structure can withstand an earthquake by suppressing the shaking and rattling of the door.

According to the third invention, the repulsive force can be applied in the opening direction by the elastic member on the closing side while the shielding door in the closed state is locked. Therefore, for example, the shielding door against rolling during an earthquake. The structure can withstand an earthquake by suppressing the shaking and rattling of the door.

According to the fourth invention, the closed door and the frame type frame can be sealed by the closed side elastic member.

According to the fifth invention, a gasket is attached to one of the frame type frame and the shielding door, and a ridge portion is provided on the other so that the gasket is brought into contact with the intermediate portion in the width direction, so that the sealing property can be improved. it can.

According to the sixth invention, since the drive device includes a torque limiter, it is possible to prevent damage by preventing overload on each part when opening / closing or when an earthquake occurs.

According to the seventh invention, since the lock device can be operated after the shield door is surely opened, the shield door can be surely locked in the open state.

According to the eighth invention, since the locking device can be operated after the shielding door is securely closed, the shielding door can be reliably locked in the closed state.

According to the ninth invention, since the heat insulating material is arranged inside the storage box for accommodating the electric motor, the electric motor can be protected from the external heat and the failure due to the heat of the electric motor can be prevented.

According to the tenth invention, since the output shaft of the drive device protrudes in the vertical direction, the conduction chain is simply wound around the drive sprocket fixed to the output shaft and the driven sprocket fixed to the hinge shaft. The shield door can be switched between the open state and the closed state with various configurations.

It is the schematic of the nuclear power generation facility provided with the closing device which concerns on embodiment of this invention. FIG. 5 is a perspective view showing a case where the closing devices according to the embodiment are used side by side vertically and horizontally, and each closing device is in the closed state. It is a figure corresponding to FIG. 2 when the closing device is in an open state. It is a block diagram of a closing device. It is a front view of one closing device. It is a front view which shows the case where two closing devices are arranged close to each other to the left and right. It is a top view which shows the case where two closing devices are arranged close to each other to the left and right. It is a side view of the closing device in a closed state. It shows the case where the closing device is in an open state, and is the cross-sectional view corresponding to line IX-IX in FIG. FIG. 5 is a cross-sectional view taken along line X-X in FIG. It is an enlarged view of the part A of FIG. FIG. 5 is a sectional view taken along line XII-XII in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is essentially merely an example and is not intended to limit the present invention, its application or its use.

(Structure of nuclear power generation facility 100)
FIG. 1 is a side view of a nuclear power plant 100 provided with a closing device according to an embodiment of the present invention. The nuclear power generation facility 100 includes a reactor building 102 in which the reactor pressure vessel 101 is stored, a turbine building 104 in which a turbine device 103 rotated by steam pumped from the reactor pressure vessel 101 is stored, and a reactor building 102. It is equipped with an MS tunnel chamber 105 that connects the reactor building 104 and the turbine building 104. A main steam pipe 106 is connected to the reactor pressure vessel 101, and the main steam pipe 106 extends through the MS tunnel chamber 105 to the turbine building 104 and is connected to the turbine device 103.

An operation floor 102a is provided on the top floor of the reactor building 102. An opening 102b is formed on the wall of the operation floor 102a of the reactor building 102 to release internal pressure in the event of an abnormal situation such as when the main steam pipe 106 or the like ruptures. Further, on the wall of the operation floor 102a, when the pressure inside the reactor building 102 rises abnormally, the blow is pushed out of the reactor building 102 and released to release the internal pressure from the opening 102a. A safety device called an out panel (BOP) 110 is provided. Instead of the blowout panel 110, a safety device such as a rupture disk that releases internal pressure by bursting itself can be provided. Since the blowout panel 110 and the rupture disc have been well known in the past, detailed description thereof will be omitted.

Further, an operation floor 104a is also provided on the uppermost floor of the turbine building 104, and an opening (not shown) for releasing internal pressure in the event of an abnormal situation is formed on the wall of the operation floor 104a. At the same time, a safety device such as a blowout panel or a rupture disc can be provided.

Further, although not shown, the wall of the MS tunnel chamber 105 is also provided with an opening for releasing internal pressure when an abnormal situation occurs, and a safety device such as a rupture disk can be provided. The MS tunnel chamber 105 is also called a main steam pipe tunnel chamber (MSIV chamber).

(Function and arrangement of closing device 1)
When an abnormal situation occurs in the reactor building 102 and the internal pressure exceeds a predetermined value, the blowout panel 110 comes off or the rupture disk bursts and the opening 102b is opened. Similarly, in the turbine building 104 and the MS tunnel chamber 105, when the internal pressure exceeds a predetermined value, the blowout panel 110 comes off or the rupture disk bursts and the opening is opened. This can prevent large-scale damage to the reactor building 102, turbine building 104 and MS tunnel chamber 105, but if the blowout panel 110 remains detached or the rupture disk remains ruptured, There is a risk that radioactive materials in the buildings 102 and 104 and in the MS tunnel room 105 will continue to leak out of the facility. On the other hand, the closing device 1 shown in FIGS. 2 and 3 can be provided in the buildings 102, 104 and the MS tunnel room 105, and the opening 102b opened when an abnormality occurs can be closed by the closing device 1. To do so. FIG. 2 shows a closed state in which the opening 102b opened when an abnormal situation occurs is closed, and FIG. 3 shows a normal state (open state).

As shown in FIGS. 2 and 3, the closing device 1 may be provided on the indoor side of the reactor building 102 or on the outdoor side of the building. When the closing device 1 is provided on the walls of the turbine building 104 and the MS tunnel chamber 105, it may be provided inside the wall or outside the wall in the same manner. Further, the closing device 1 can be attached to an airtight wall 200 provided inside the wall of the reactor building 102. As shown in FIG. 3, the airtight wall 200 is formed with an opening 201 corresponding to the opening 102b formed in the wall of the reactor building 102. Therefore, when the closing device 1 is in the open state, the opening 201 of the airtight wall 200 and the opening 102b of the wall of the reactor building 102 are opened, so that the pressure when an abnormal situation occurs is , The opening 201 of the airtight wall 200 and the opening 102b of the wall of the reactor building 102 can escape to the outside. The airtight wall 200 does not have to be a complete wall structure, and may be formed by combining, for example, frame-shaped members.

The closing device 1 can be provided so as to be arranged in the vertical direction and can be provided so as to be arranged in the horizontal direction. The larger the number of closing devices 1 provided, the larger the effective opening area can be. The effective opening area can be set to be substantially the same as the opening 102b of the wall of the reactor building 102. It is conceivable to increase the effective opening area by increasing the size of the closing device 1, but since the workability during manufacturing, transportation, and installation deteriorates, in the present embodiment, these workability are not significantly impaired. As described above, a plurality of relatively small closing devices 1 are used, and they are arranged in a state of being close to each other so as to obtain a desired effective opening area. A gap may or may not be provided between the adjacent closing devices 1.

In particular, a plurality of pipes such as the main steam pipe 106 penetrate through the wall of the MS tunnel chamber 105, and it is difficult to provide a large closing device 1 on this wall due to the layout. Therefore, a small closing device A plurality of 1's are provided. As a result, the closing device 1 can be laid out to obtain a desired effective opening area while avoiding the main steam pipe 106 and the like.

In the following description, a case where the closing device 1 is provided on the wall of the reactor building 102 will be described, but the present invention can also be applied to the turbine building 104 and the MS tunnel chamber 105. In the description of this embodiment, as shown in each figure, the inside of the reactor building 102 is simply referred to as the inside, the outside of the reactor building 102 is simply referred to as the outside, and when facing from the inside to the outside, it is to the right. The side that becomes the left side is simply called the right side, and the side that becomes the left side when facing from the inside to the outside is simply called the left side.

(Structure of closing device 1)
As shown in FIG. 5, the closing device 1 includes a shielding door 10 that closes the opening 102b of the wall of the reactor building 102, a frame-shaped frame 20 as a support for supporting the shielding door 10, and the shielding door 10. The first hinge 31 and the second hinge 32 supported on the frame type frame 20, the drive device 40 for driving the shielding door 10, the control device 50 shown in FIG. 4, the operation switch 51, the open side limit switch 52, and the like. It includes a closing side limit switch 53, a locking side limit switch 54, an unlocking side limit switch 55, an open state holding member 60 (shown in FIGS. 8 and 9), and a closing state holding member 70.

The lock-side limit switch 54 is a switch that detects that the first cannuki 11 and the second cannuki 12 are in the locked position. The unlock side limit switch 55 is a switch that detects that the first cannuki 11 and the second cannuki 12 are in the unlocked position. When the shielding door 10 changes from the locked state in the open state to the locked state in the closed state, the electric motor 41 is first driven to further press the shielding door 10 in the open position in the opening direction. When a predetermined time (for example, 1 second) elapses after the electric motor 41 starts outputting in the opening direction, the cannuki drive device 13 is driven in the unlocking direction, and the first cannuki 11 and the second cannuki 12 move to the unlocked position. To start. When the unlock side limit switch 55 is closed, the pressing of the electric motor 41 in the opening direction is stopped, and the driving of the Kannuki drive device 13 in the unlocking direction is also stopped. After that, it operates so that the shielding door is closed.

When the shielding door 10 changes from the locked state in the closed state to the locked state in the open state, the electric motor 41 is first driven to further press the shielding door 10 in the closed position in the closing direction. .. When a predetermined time (for example, 1 second) elapses after the electric motor 41 starts outputting in the closing direction, the cannuki drive device 13 is driven in the unlocking direction, and the first cannuki 11 and the second cannuki 12 move to the unlocked position. To start. When the unlock side limit switch 55 is closed, the pressing of the electric motor 41 in the closing direction is stopped, and the driving of the Kannuki drive device 13 in the unlocking direction is also stopped. After that, the shielding door 10 is operated so as to be in the open state.

As shown in FIG. 3, the frame type frame 20 is a member attached to the airtight wall 200. A plurality of openings 201 are formed in the airtight wall 200. FIG. 3 shows an example in which six openings 201 are formed in the airtight wall 200, but the number and arrangement of the openings 201 are not limited to those shown in FIG. The airtight wall 200 is provided with a support column 202 extending in the vertical direction and a horizontal partition 203 extending in the horizontal direction in order to form a plurality of openings 201. The strut portion 202 is formed so that the openings 201 are arranged in the horizontal direction, and the horizontal partition portion 203 is formed so that the openings 201 are arranged in the vertical direction.

As shown in FIG. 3, the frame type frame 20 is provided on the first frame material 21 extending in the horizontal direction along the upper edge of the opening 201 of the airtight wall 200 and the lower edge of the opening 201 of the airtight wall 200. On the second frame material 22 extending horizontally along the third frame material 23 extending vertically along the left edge of the opening 201 of the airtight wall 200, and on the right edge of the opening 201 of the airtight wall 200. It is provided with a fourth frame material 24 extending in the vertical direction along the line. The upper end of the third frame material 23 is connected to the left end of the first frame material 21, and the upper end of the fourth frame material 24 is connected to the right end of the first frame material 21. Further, the lower end of the third frame material 23 is connected to the left end of the second frame material 22, and the lower end of the fourth frame material 24 is connected to the right end of the second frame material 22. As a result, a frame-shaped frame 20 having a rectangular frame shape long in the vertical direction is configured so as to correspond to the shape of the shielding door 10. As shown in FIG. 5, the width of the fourth frame material 24 is set wider than the widths of the first frame material 21, the second frame material 22, and the third frame material 23. The frame type frame 20 may have a rectangular shape that is long in the left-right direction.

As shown in FIGS. 7 and 10, a gasket (closing side elastic member) 25 interposed between the frame type frame 20 and the shielding door 10 is provided on the inner side surface of the frame type frame 20. The gasket 25 is formed in a rectangular shape extending along the first frame material 21, the third frame material 23, the second frame material 22, and the fourth frame material 24 of the frame type frame 20, and the entire frame type frame 20 is formed. It is continuous over the circumference. The gasket 25 is made of an elastic material such as rubber or a thermoplastic elastomer, and is formed in a hollow shape as shown in FIG. The frame 20 side of the gasket 25 is fixed to the frame 20 via a fixing member 26. When the shielding door 10 is in the open state, the shielding door 10 is not in contact with the gasket 25, and the gasket 25 has a shape as shown by a virtual line in FIG.

As shown in FIGS. 2, 3 and 5, the shielding door 10 has a rectangular shape that is long in the vertical direction as a whole, and has an outer shape that is larger than the inner shape of the frame type frame 20. When the shielding door 10 is in the closed state, the entire inside of the frame type frame 20 can be closed by the shielding door 10.

As shown in FIG. 5, a first hinge 31 and a second hinge 32 are interposed between the shielding door 10 and the fourth frame member 24 of the frame type frame 20. The first hinge 31 is a member that supports a portion above the central portion in the vertical direction of the shielding door 10, and the second hinge 32 is a member that supports a portion below the central portion in the vertical direction of the shielding door 10. Is. The number of hinges is not limited to two, and may be three or more.

The first hinge 31 has a door-side fixing plate 31a fixed to the inner surface side of the shielding door 10, a frame-side fixing plate 31b fixed to the frame-type frame 20, and a vertical direction fixed to the door-side fixing plate 31a. It has an extending shaft 31c. In this embodiment, the upper portion of the shaft 31c is fixed so as not to rotate relative to the door side fixing plate 31a, and the lower portion of the shaft 31c is rotatably supported with respect to the frame side fixing plate 31b. Has been done. The second hinge 32 has a door-side fixing plate 32a fixed to the inner surface side of the shielding door 10, a frame-side fixing plate 32b fixed to the frame-type frame 20, and a vertical direction fixed to the door-side fixing plate 32a. It has an extending shaft 32c. In this embodiment, the lower portion of the shaft 32c is fixed so as not to rotate relative to the door side fixing plate 32a, and the upper portion of the shaft 32c is rotatably supported with respect to the frame side fixing plate 32b. Has been done. The lower portion of the shaft 32c is formed so as to project downward from the door-side fixing plate 32a. The first hinge 31 and the second hinge 32 can switch between a closed state in which the shielding door 10 is rotatably supported around the shafts 31c and 32c to close the opening 102b and an open state in which the opening 102b is opened. It has become. The structures of the first hinge 31 and the second hinge 32 described above are examples, and any hinge may have any structure, but the shaft of the upper hinge and the shaft of the lower hinge are opposite to each other. By adopting the protruding structure, for example, it is possible to prevent the shielding door 10 from moving in the vertical direction with respect to the frame type frame 20 at the time of an earthquake, and it is possible to improve the earthquake resistance.

As shown in FIG. 11, the peripheral edge of the shielding door 10 is provided with a ridge portion 16 that comes into contact with the widthwise intermediate portion of the gasket 25 when the shielding door 10 is in the closed state. The ridge portion 16 projects from the outer surface of the shielding door 10 in a direction approaching the frame type frame 20, and extends in a continuous annular shape along the peripheral edge portion of the shielding door 10. As shown in FIG. 12, the amount of protrusion of the ridge portion 16 allows the gasket 25 to be elastically deformed when the shielding door 100 is in the closed state so as to be brought into close contact with the tip portion of the ridge portion 16. In that state, the gasket 25 is set so as not to cause bottoming out. When the tip end portion of the ridge portion 16 comes into contact with the intermediate portion in the width direction of the gasket 25, the contact surface pressure is increased, whereby the sealing property can be improved. When the shielding door 10 is in the closed state and the ridge portion 16 comes into contact with the gasket 25, the gasket 25 exerts a repulsive force in the opening direction on the shielding door 10 in the closed state. Further, although not shown, a gasket may be provided on the shielding door 10 and a ridge portion may be provided on the frame type frame 20.

As shown in FIG. 5 and the like, the shielding door 10 is provided with a first cannuki 11 and a second cannuki 12. The first cannuki 11 is supported so as to be movable in the vertical direction with respect to a portion of the shielding door 10 distant from the first hinge 31, and has a locking position protruding upward from the upper end of the shielding door 10 and the shielding door 10. It can be switched to a non-locking position located below the upper end. The second cannuki 12 is supported so as to be movable in the vertical direction with respect to a portion of the shielding door 10 away from the second hinge 32, and has a locking position protruding downward from the lower end of the shielding door 10 and the shielding door 10. It can be switched to a non-locking position located above the lower end.

The shielding door 10 is provided with a cannuki drive device 13 for driving the first cannuki 11 and the second cannuki 12. The Kannuki drive device 13 is composed of, for example, an electric motor and a well-known cam mechanism that converts the rotational motion of the electric motor into a linear motion in the vertical direction. By rotating the electric motor in a predetermined direction by a predetermined amount, the first is The first cannuki 11 and the second cannuki 12 can be set to the locked position, and the first cannuki 11 and the second cannuki 12 in the locked position can be set to the unlocked position by reversing the electric motor. it can. The Kannuki drive device 13 can also be configured by, for example, a linear actuator, a ball screw mechanism, or the like.

The first cannuki 11, the second cannuki 12, and the cannuki drive device 13 constitute a second lock device that locks the shield door 10 in the closed state, and a first lock device that locks the shield door 10 in the open state. Is configured. The lock device that locks the shield door 10 in the closed state and the lock device that locks the shield door 10 in the open state may be the same or may be configured separately. Since the closed state and the open state can be locked by the same first cannuki 11 and second cannuki 12, the structure can be simplified as compared with the case where separate cannuki are provided.

A closed state holding member 70 is provided on each of the first frame material 21 and the second frame material 22 of the frame type frame 20. The closed state holding member 70 of the first frame member 21 is arranged directly above the first cannuki 11 of the shield door 10 in the closed state, and when the first cannuki 11 protrudes upward and becomes a locking position. It has a cannuki insertion hole 70a to be inserted into. When the first cannuki 11 is inserted into the cannuki insertion hole 70a from below, the first cannuki 11 is locked to the closed state holding member 70 of the first frame member 21. Further, the closed state holding member 70 of the second frame member 22 is arranged directly below the second cannuki 12 of the shield door 10 in the closed state, and the second cannuki 12 projects downward to be in the locking position. It has a cannuki insertion hole 70a to be inserted at the time. When the second cannuki 12 is inserted into the cannuki insertion hole 70a from above, the second cannuki 12 is locked to the closed state holding member 70 of the second frame member 22. The shielding door 10 is held in the closed state by engaging the first cannuki 11 and the second cannuki 12 with the closed state holding member 70 of the first frame material 21 and the closed state holding member 70 of the second frame material 22. ..

On the other hand, as shown in FIG. 8, the airtight wall 200 is provided with lateral members 210 and 210 extending inward at intervals in the vertical direction so as to correspond to the height dimension of the closing device 1. The inner ends of the horizontal members 210 and 210 are fixed to the vertical members 211 arranged inwardly away from the airtight wall 200. Further, the inner ends of the horizontal members 210 and 210 are connected to each other by a connecting member 212 extending in the vertical direction.

The upper and lower lateral members 210 and 210 are each provided with an open state holding member 60. The open state holding member 60 of the upper horizontal member 210 is arranged directly above the first cannuki 11 of the shielding door 10 in the open state, and when the first cannuki 11 protrudes upward and becomes a locking position. It has a cannuki insertion hole 60a to be inserted into the door. When the first cannuki 11 is inserted into the cannuki insertion hole 60a from below, the first cannuki 11 is locked to the open state holding member 60 of the upper lateral member 210. Further, the open state holding member 60 of the lower lateral member 210 is arranged directly below the second cannuki 12 of the shielding door 10 in the open state, and the second cannuki 12 projects downward to the locking position. It has a cannuki insertion hole 60a to be inserted when it becomes. When the second cannuki 12 is inserted into the cannuki insertion hole 60a from above, the second cannuki 12 is locked to the open state holding member 60 of the lower lateral member 210. The shielding door 10 is held in the open state by locking the first cannuki 11 and the second cannuki 12 to the upper and lower open state holding members 60.

As shown in FIG. 5, an open side limit switch 52 and a closing side limit switch 53 are provided on the upper portion of the shielding door 10. The open side limit switch 52 is provided closer to the first hinge 31 than the first cannuki 11, and has a first rod-shaped portion 52a arranged so as to project upward from the upper end portion of the shielding door 10. ing. The first rod-shaped portion 52a is provided so as to be movable in the vertical direction with respect to the main body of the open side limit switch 52, and is constantly urged upward by an urging member such as a spring (not shown) and protrudes upward. Is to be maintained. Further, the closing side limit switch 53 is provided on the side far from the first hinge 31, and has a second rod-shaped portion 53a arranged so as to project upward from the upper end portion of the shielding door 10. Like the first rod-shaped portion 52a, the second rod-shaped portion 53a is constantly urged upward by an urging member.

The first frame material 21 of the frame type frame 20 is provided with a closing side contact member 71. The closing side contact member 71 is arranged directly above the closing side limit switch 53 of the shielding door 10 in the closed state, and comes into contact with the second rod-shaped portion 53a of the closing side limit switch 53 to contact the second rod-shaped portion. It is a member for pushing 53a downward. Therefore, when the shielding door 10 is in the closed state, the second rod-shaped portion 53a of the closing side limit switch 53 abuts on the closing side contact member 71 and is pushed downward, whereby the closing side limit switch 53 is closed. On the other hand, when the shielding door 10 is opened, the second rod-shaped portion 53a moves upward and the closing side limit switch 53 opens. The opening and closing of the closing side limit switch 53 may be reversed.

It is also possible to provide an interlock function that operates as follows. For example, when all of the following conditions are satisfied, the operation of locking the shielding door 10 in the open state can be started. If each switch is operated while the following conditions are not met, a buzzer or the like is sounded to notify the user, although not shown.
Condition 1: The open side limit switch 52 is OFF or the lock side limit switch 54 is OFF.
Condition 2: The electric motor 41 is stopped Condition 3: The Kannuki drive device 13 is stopped When all of the following conditions are satisfied, the shielding door 10 can be started to lock in the closed state. If each switch is operated while the following conditions are not met, a buzzer or the like is sounded to notify the user.
Condition 1: The closing side limit switch 53 is OFF or the lock side limit switch 54 is OFF.
Condition 2: The electric motor 41 is stopped Condition 3: The Kannuki drive device 13 is stopped As shown in FIG. 8, the lateral member 210 on the upper side of the airtight wall 200 is provided with the open side contact member 61. The open-side abutting member 61 is arranged directly above the open-side limit switch 52 of the shield door 10 in the open state, and comes into contact with the first rod-shaped portion 52a of the open-side limit switch 52 to contact the first rod-shaped portion. It is a member for pushing 52a downward. Therefore, when the shielding door 10 is in the open state, the first rod-shaped portion 52a of the open side limit switch 52 abuts on the open side contact member 61 and is pushed downward, whereby the open side limit switch 52 is closed. On the other hand, when the shielding door 10 is closed, the first rod-shaped portion 52a moves upward and the open side limit switch 52 opens. The opening and closing of the open side limit switch 52 may be reversed.

The open side limit switch 52 and the closed side limit switch 53 are open / closed state detection units that detect the open / closed state of the shielding door 10. Although not shown, the open / closed state detection unit may be composed of a sensor or the like other than the limit switch. Further, the location where the open / closed state detection unit is arranged is not limited to the upper side of the shielding door 10, but may be the lower side or the intermediate portion in the vertical direction. Further, the open / closed state detection unit may be provided on the hinges 31, 32 and the like.

As shown in FIG. 5, on the side of the shielding door 10 away from the hinges 31 and 32, an opening-side elastic member 18 for applying a repulsive force in the closing direction to the shielding door 10 in the open state is provided. Has been done. The open-side elastic members 18 are arranged at the upper end and the lower end of the inner surface of the shielding door 10, respectively, and are formed so as to project from the inner surface. Examples of the material constituting the open-side elastic member 18 include rubber, a thermoplastic elastomer, and a spring. As shown by a virtual line in FIG. 7, when the shielding door 10 is in the open state, the protruding end portion of the open side elastic member 18 comes into contact with the lateral member 210 of the airtight wall 200, whereby the shielding door in the open state It acts so as to exert a repulsive force on 10 in the closing direction.

As shown in FIG. 5, on the inner surface side of the shielding door 10, a main body portion of the opening side limit switch 52 and the closing side limit switch 53, and a storage box 14 for accommodating the Kannuki drive device 13 are provided. As shown in FIG. 10, the storage box 14 is provided so as to reach the lower end portion from the upper end portion of the shielding door 10. Although not shown in FIG. 10, the storage box 14 is formed so as to be able to store the first cannuki 11 and the second cannuki 12 in the unlocked position. Further, as shown in FIG. 10, the storage box 14 is provided on the side of the shielding door 10 away from the first hinge 31 and the second hinge 32. Inside the storage box 14, a heat insulating material 14a is arranged so as to cover the inner surface of the storage box 14. The heat insulating material 14a is arranged so as to come into contact with the side wall portion of the storage box 14 and the wall located inside. The heat insulating material 14a is made of glass wool or the like, which has been well known in the past. As a result, it becomes possible to protect the main body portion of the open side limit switch 52 and the closed side limit switch 53 and the cannuki drive device 13 from heat. Further, an oil seal may be attached to the shaft penetrating portion of the first rod-shaped portion 11, the second cannuki 12, the first rod-shaped portion 52a, the second rod-shaped portion 53a in the storage box 14, and the shaft penetrating portion of the output shaft 43a of the storage box 4. it can. This protects the electrical components from heat and moisture.

As shown in FIG. 10, the storage box 14 is provided with a lid member 14b that closes the emergency opening. The lid member 14b is normally attached to the storage box 14, but for example, when the Kannuki drive device 13 does not operate, the lid member 14b can be removed to open the emergency opening. For example, it is possible to operate the Kannuki drive device 13 by inserting a tool or the like into the inside of the storage box 14 through the emergency opening.

(Structure of drive device 40)
The drive device 40 is for driving the shielding door 10 around the shafts 31c and 32c of the first hinge 31 and the second hinge 32, and as shown in FIG. 5, the electric motor 41 constituting the rotational force generator A speed reducer 42, a torque limiter 43 into which the output of the speed reducer 42 is input, and a storage box 47 for storing these are provided. The storage box 47 is arranged on the right side of the shielding door 10, and in this embodiment, it is located adjacent to the right side of the fourth frame member 24 of the frame type frame 20. The storage box 47 has a shape that is long in the vertical direction. The upper end of the storage box 47 is the upper end of the drive device 40, and is located below the central portion of the shielding door 10 in the vertical direction. As a result, the drive device 40 is arranged on the side of the shielding door 10 below the central portion in the vertical direction of the shielding door 10.

The electric motor 41 has a posture in which the rotation shaft extends in the vertical direction, and is arranged on the upper side in the storage box 47. The speed reducer 42 is a well-known gear speed reducer, and has a posture in which the rotation shaft extends in the vertical direction, and is arranged in the intermediate portion in the vertical direction in the storage box 47, that is, below the electric motor 41. The rotational force of the electric motor 41 is input to the speed reducer 42 and output from the speed reducer 42. The torque limiter 43 has been well known in the past, and is configured to be able to mechanically cut off the transmission of torque when a torque equal to or higher than a predetermined value is applied. The structure of the torque limiter 43 is not particularly limited, and various torque limiters can be used.

The torque limiter 43 is arranged on the lower side in the storage box 47, that is, below the speed reducer 42. The output shaft of the speed reducer 42 is connected to the input side of the torque limiter 43. Further, an output shaft 43a is connected to the output side of the torque limiter 43. The output shaft 43a projects downward from the lower wall of the storage box 47. A drive sprocket 44 is fixed to the lower end of the output shaft 43a. A driven sprocket 45 is fixed to the lower end of the shaft 32c of the second hinge 32. The drive sprocket 44 and the driven sprocket 45 are arranged at the same height. A transmission chain (transmission member) 46 made of a roller chain or the like is wound around the drive sprocket 44 and the driven sprocket 45. The output shaft 43a, the drive sprocket 44, the driven sprocket 45, and the transmission chain 46 are members that constitute the drive device 40.

Therefore, the rotational force of the electric motor 41 is input to the torque limiter 43 after being increased by the speed reducer 42, and the rotational force output from the torque limiter 43 acts to rotate the drive sprocket 44 via the output shaft 43a. To do. When the drive sprocket 44 rotates, the driven sprocket 45 rotates via the transmission chain 46, and the rotational force of the driven sprocket 45 is transmitted to the shaft 32c of the second hinge 32. Since the shaft 32c is fixed to the door-side fixing plate 32a, the shielding door 10 can be rotated by the rotational force of the shaft 32c. The rotation direction of the shielding door 10 can be changed by switching the rotation direction of the electric motor 41.

As shown in FIGS. 10 and 12, a heat insulating material 47a is arranged inside the storage box 47. The heat insulating material 47a is configured in the same manner as the heat insulating material 14a of the storage box 14, and is arranged so as to come into contact with the side wall portion of the storage box 47 and the wall located inside. This makes it possible to protect the electric motor 41, the reduction gear 42, and the torque limiter 43 from heat. The heat insulating material 47a is also a member constituting the drive device 40. In FIGS. 10 and 12, the electric motor 41, the speed reducer 42, and the torque limiter 43 are omitted.

(Configuration of control device 50)
The control device 50 shown in FIG. 4 is for controlling the electric motor 41 and the Kannuki drive device 13 of the drive device 40. An operation switch 51, an open side limit switch 52, and a closed side limit switch 53 are connected to the control device 50. The operation switch 51 is a switch for opening and closing the shielding door 10, but is not limited to this, and the shielding door 10 can be received in any trigger signal, and the shielding door 10 is opened or closed by receiving a predetermined trigger signal. You may choose to. Further, the control device 50 can determine whether the shielding door 10 is in the open state or the closed state by detecting the open / closed state of the open side limit switch 52 and the closed side limit switch 53.

When the control device 50 detects the operation of the operation switch 51 and closes the shield door 10 in the open state, the cannuki drive device 13 is operated to unlock the first cannuki 11 and the second cannuki 12. After the position is set, the rotation control in the closing direction is performed on the electric motor 41 of the drive device 40. As a result, the shielding door 10 rotates in the closing direction, and the closing side limit switch 53 is eventually closed by the closing side contact member 71.

When the closing side limit switch 53 is closed, it means that the shielding door 10 is in the closed state. Therefore, the control device 50 detects when the shielding door 10 is closed by the closing side limit switch 53. Can be done. For example, the drive device 40 is operated in the direction of closing the shielding door 10, and the lock device 13 is operated after a predetermined time has elapsed after the closing side limit switch 53 detects that the shielding door 10 is in the closed state. Can be made to. This can be done with the second controller. For example, the control device 50 can operate the drive device 40 until the lock side limit switch 54 is closed after the shielding door 10 is closed, so that the shielding door 10 is held in the closed state. However, the cannuki drive device 13 can be operated after a lapse of a predetermined time. Therefore, the drive device 40 can be operated until the shield door 10 is closed and the lock side limit switch 54 is closed, and the cannuki drive device 13 is pressed while the shield door 10 is securely pressed against the closed side elastic member 25. Can be activated. When the shielding door 10 is closed, the torque limiter 42 is interposed between the torque limiter 42 and the electric motor 41, so that the rotation of the electric motor 41 is allowed by the action of the torque limiter 42. While the electric motor 41 rotates, the shielding door 10 is pressed against the gasket 25.

When a predetermined time (for example, 2 seconds) has elapsed after the detection of the closing side limit switch 53, the cannuki drive device 13 is operated so as to lock the first cannuki 11 and the second cannuki 12. That is, by continuing to apply a force in the closing direction by the drive device 40 to the shield door 10 in the closed state for a predetermined time, the shield door 10 is surely closed, and then the first cannuki 11 and the second By setting the cannuki 12 in the locking position, the shielding door 10 is securely locked in the closed state.

Further, when the control device 50 detects the operation of the operation switch 51 and opens the closed shield door 10, the Kannuki drive device 13 is operated to deactivate the first Kannuki 11 and the second Kannuki 12. After the locking position is set, the rotation control of the electric motor 41 of the drive device 40 in the opening direction is performed. As a result, the shielding door 10 rotates in the opening direction, and eventually the opening side limit switch 52 is closed by the opening side contact member 61.

When the open side limit switch 52 is closed, it means that the shielding door 10 is in the open state. Therefore, the control device 50 detects when the shielding door 10 is opened by the open side limit switch 52. Can be done. For example, the drive device 40 is operated in the direction of opening the shield door 10, and the lock device 13 is operated after a predetermined time has elapsed after the open side limit switch 52 detects that the shield door 10 is in the open state. Can be made to. This can be done with the first controller. The first control device and the second control device may not be separated, and may be configured by one control device. For example, the control device 50 operates the drive device 40 until the lock side limit switch 54 is closed after the shielding door 10 is opened, so that the shielding door is kept in the open state while being operated. The cannuki drive device 13 can be operated after a lapse of a predetermined time. Therefore, the drive device 40 can be operated until the shield door 10 is opened and the lock side limit switch 54 is closed, and the cannuki drive device 13 is pressed while the shield door 10 is securely pressed against the open side elastic member 18. Can be activated. When the shielding door 10 is opened, the torque limiter 42 is interposed between the torque limiter 42 and the electric motor 41, so that the rotation of the electric motor 41 is allowed by the action of the torque limiter 42. While the electric motor 41 rotates, the elastic member 18 on the open side of the shielding door 10 is pressed against the lateral member 210 of the airtight wall 200.

When a predetermined time (for example, 2 seconds) has elapsed after the detection of the open side limit switch 52, the cannuki drive device 13 is operated so as to lock the first cannuki 11 and the second cannuki 12. That is, by continuing to apply a force in the closing direction by the drive device 40 to the shield door 10 in the open state for a predetermined time, the shield door 10 is surely opened, and then the first cannuki 11 and the second By setting the cannuki 12 in the locking position, the shielding door 10 is securely locked in the open state.

(Layout of closing device 1)
As shown in FIG. 6, when two closing devices 1 arranged so as to be adjacent to each other in the horizontal direction are viewed, the top and bottom of the closing device 1 on the left side are inverted with respect to the closing device 1 on the left side. Can be used as the closing device 1 on the right side. In the closing device 1 on the left side of FIG. 6, the first frame material 21 of the frame type frame 20 is located on the upper side, the second frame material 22 is located on the lower side, the third frame material 23 is located on the left side, and the fourth frame material 24 is located on the right side. On the other hand, the opening / closing device 1 on the right side of FIG. 6 has the top and bottom inverted, so that the first frame material 21 of the frame type frame 20 is on the bottom, the second frame material 22 is on the top, and the third frame material 23 is on the top. Is located on the right and the fourth frame member 24 is located on the left. One opening closing unit can be configured by the closing device 1 on the left side and the closing device 1 on the right side shown in FIG.

Further, as shown in FIG. 5, the drive device 40 of the closing device 1 is arranged on the right side of the shield door 10 below the central portion in the vertical direction of the shield door 10, and is located above the drive device 40. Is a space that can be a dead space S. As shown in FIG. 6, by using the upside-down closing device 1 as the closing device 1 on the right side, the driving device 40 of the closing device 1 on the right side moves up and down the shielding door 10 on the left side of the shielding door 10. It will be placed above the center of the direction. Therefore, since the driving device 40 of the closing device 1 on the right side can be arranged above the driving device 40 of the closing device 1 on the left side, the dead space S can be effectively utilized and the closing device 1 on the left side and the closing device 1 on the right side can be closed. The device 1 can be arranged so as to be close to each other in the left-right direction.

Further, since the drive device 40 of the closing device 1 on the right side has the drive sprocket 44, the driven sprocket 45, and the transmission chain 46 above it, it does not interfere with the drive device 40 of the closing device 1 on the left side. ..

(Action and effect of the embodiment)
As described above, according to the closing device 1 according to this embodiment, the shielding door 10 is rotatably supported by the frame-shaped frame 20 by the shafts 31c and 32c, so that the shielding door 10 is normally open. It is possible to secure a wide effective opening area by not blocking the opening 102a located next to the main closing device 1.

Further, since the shafts 31c and 32c supporting the shielding door 10 extend in the vertical direction, the direction of the load is the axial direction even if a large load is applied in the vertical direction. This makes it possible to hold the shielding door 10 in an open state without forming a large-scale structure as compared with the case where it acts around the shaft. Therefore, the structure for holding the shielding door 10 in the open state becomes compact, and it does not easily interfere with the release of internal pressure when an abnormal situation occurs. Further, in the open state, the shielding door 10 stands by at a position perpendicular to the frame type frame 20, so that the pressure in an abnormal situation can be prevented from being directly received.

Further, when the blowout panel 110 comes off or the rupture disk bursts due to the occurrence of an abnormal situation, the shielding door 10 can be rotated around the shafts 31c and 32c by the drive device 40 to be closed. become. As a result, it is possible to prevent radioactive substances and the like existing in the buildings 102 and 104 from leaking to the outside of the facility.

Further, as shown in FIG. 6, the total opening area can be increased by preparing a plurality of closing devices 1 and arranging them so close to each other in the horizontal direction. In this case, since the drive device 40 is located on the side of the shield door 10 below the central portion in the vertical direction of the shield door 10, the closing device 1 arranged next to the drive device 1 is turned upside down. The drive device 40 is located on the side of the shielding door 10 above the central portion in the vertical direction of the shielding door 10. Therefore, since the drive devices 40 of the adjacent closing devices 1 can be arranged side by side in the vertical direction, the dead space S is reduced and the effective opening area is widely secured. As a result, a layout is realized in which the pressure inside the buildings 102 and 104 can be easily released when an abnormal situation occurs.

Further, the drive device 40 may be configured to be located on the side of the shielding door 10 above the central portion in the vertical direction of the shielding door 10. In this case, by turning the closing device 1 arranged next to it upside down, the drive device 40 is located on the side of the shielding door 10 below the central portion in the vertical direction of the shielding door 10. Therefore, the drive devices 40 can be arranged side by side in the vertical direction.

Further, when the shielding door 10 is closed, the shielding door 10 is locked by the first cannuki 11 and the second cannuki 12. At this time, since the repulsive force acts on the shielding door 10 in the opening direction by the gasket 25, for example, the shielding door 10 is suppressed from shaking and rattling against rolling when an earthquake occurs. Further, when the shielding door 10 is opened and the shielding door 10 is locked by the first cannuki 11 and the second cannuki 12, a repulsive force acts on the shielding door 10 in the closing direction by the open side elastic member 18. Therefore, the shaking and rattling of the shielding door 10 are similarly suppressed.

Further, the output of the electric motor 41 is input to the shafts 31c and 32c of the hinges 31 and 32 via the torque limiter 43, whereby the shielding door 10 is rotated from the closed state to the open state and vice versa. Can be done. When the shielding door 10 is closed or opened, the shielding door 10 is pressed against other members. At this time, the torque limiter 43 is between the electric motor 41 and the shielding door 10. It is possible to prevent an overload from being applied to each part by interposing.

Further, for example, when the shielding door 10 tries to rotate around the shafts 31c and 32c due to rolling during an earthquake, an unreasonable force is applied to the drive device 40 from the output side. The torque limiter 43 reduces the force applied to each part.

The above embodiments are merely exemplary in all respects and should not be construed in a limited way. Furthermore, all modifications and modifications that fall within the equivalent scope of the claims are within the scope of the present invention.

As described above, the closing device 1 for a nuclear power generation facility according to the present invention can be installed, for example, in a reactor building or an MS tunnel room.

1 Closing device for nuclear power generation facilities 10 Shielding door 20 Frame type frame 11 1st Kannuki 12 2nd Kannuki 13 Kannuki drive device 16 Protruding part 18 Open side elastic member 25 Gasket (closing side elastic member)
31 1st hinge 31c Shaft 32 2nd hinge 32c Shaft 40 Drive unit 41 Electric motor 43 Torque limiter 43a Output shaft 44 Drive sprocket 45 Driven sprocket 46 Transmission chain (transmission member)
47 Storage Box 47a Insulation 50 Control Device 102b Opening 110 Blowout Panel

The present invention relates to a closing device provided in a nuclear power plant.

Conventionally, nuclear power generation facilities have been a reactor building in which a reactor pressure vessel is stored, a turbine building in which a turbine rotated by steam pumped from the reactor pressure vessel is stored, and an MS tunnel connecting the reactor building and the turbine building. It consists of rooms and the like. The MS tunnel chamber is also called the main steam pipe tunnel chamber (MSIV chamber).

In the reactor building and the MS tunnel room adjacent to it, it is conceivable that the internal pressure will rise significantly in the event of an abnormal situation such as when a steam pipe or the like bursts. Assuming the occurrence of such an abnormal situation, blows on the walls of the reactor building and MS tunnel room to release the internal pressure by pushing it out of the facility when the internal pressure rises abnormally. Safety devices such as an out panel (BOP) and a rupture disc that relieves internal pressure by bursting itself are installed.

If the blowout panel is left off due to the occurrence of an abnormal situation, radioactive substances in the building may continue to leak out of the facility. Therefore, for example, a closing device as disclosed in Patent Documents 1 to 3 It is considered that the opening is closed after the blowout panel is opened. The closing devices of Patent Documents 1 and 2 include a shielding door that can slide to a closed position so as to close the opening after the blowout panel is opened. Further, the closing device of Patent Document 3 includes a shielding door rotatably attached to the upper end of the frame body around a horizontal axis, and after the blowout panel is opened, the shielding door is actuated or the like. It is rotated to a closed position that closes the opening.

Japanese Patent No. 6430055 Japanese Patent No. 6494849 Japanese Patent No. 6494850

By the way, in the closing devices of Patent Documents 1 and 2, since the shielding door has a structure that slides in the horizontal direction, when it is applied to a place where blowout panels and rupture disks are densely packed, the shielding door in an open state at normal times is used. Will be positioned to block the adjacent opening, resulting in a smaller effective opening area, which can be an obstacle to relieving internal pressure in the event of an abnormal situation.

Therefore, as in Patent Document 3, a wide effective opening area can be secured by providing a shielding door that rotates around the horizontal axis so as not to block the adjacent opening when the door is normally open. Therefore, it is considered that the internal pressure is likely to escape when an abnormal situation occurs.

However, Patent Document 3 has a structure in which the shielding door at the time of opening is held in a state of being rotated upward. Then, the shielding door can be kept open even if a large earthquake directly underneath occurs, and the pressure can be released in the event of a sudden pressure rise in the building that may occur thereafter. Must be done. However, assuming the case of a large earthquake directly underneath, it is quite possible that a load that is several times larger than normal will act downward on the shield door, and under such circumstances the shield door will be It is extremely difficult to hold the door so that it does not rotate downward in consideration of the weight of the shielding door, and in the case of Patent Document 3, a large-scale drive device is required.

When the drive unit becomes large-scale, it becomes a problem to lay out the drive unit on the wall of the building so as not to interfere with the release of internal pressure when an abnormal situation occurs. In particular, when it is desired to provide a plurality of shielding doors close to each other, such as in a place where blowout panels and rupture disks are densely packed, the arrangement of the drive device becomes an even more remarkable problem.

The present invention has been made in view of this point, and an object of the present invention is to enable the shielding door to be held in an open state even when a large load is applied in the vertical direction, and to provide a plurality of shielding doors. The purpose of this is to make it possible to realize a layout in which the pressure inside the building can be easily released when an abnormal situation occurs when the components are arranged close to each other.

In order to achieve the above object, in the present invention, the shielding door is rotatably supported with respect to the support by a shaft extending in the vertical direction, and the driving device for driving the shielding door is vertically supported on the side of the shielding door. It is arranged below or above the center.

The first invention is a shielding device for a nuclear power generation facility that closes an opening formed in the wall when a blowout panel or a rupture disk is opened, which is provided on the wall constituting the nuclear power generation facility. It has a door, a support that supports the shielding door, and a shaft that is interposed between the shielding door and the support and extends in the vertical direction, and supports the shielding door rotatably around the shaft. A hinge for switching between a closed state for closing the opening and an open state for opening the opening is arranged on the side of the shielding door to be lower or higher than the central portion in the vertical direction of the shielding door. It includes a drive device having an output shaft that drives the shielding door around the shaft and a rotational force generator that generates a rotational force that rotates the output shaft, and the output shaft is parallel to the shaft of the hinge. It is characterized by being arranged in .

According to this configuration, the shield door is rotatably supported by the support by the shaft, so that the opening located next to the shield door is not blocked when the shield door is normally open. A wide effective opening area is secured. Further, since the shaft supporting the shielding door extends in the vertical direction, the direction of the load is the axial direction even if a large load acts in the vertical direction. This makes it possible to hold the shielding door in an open state without forming a large-scale structure as compared with the case where it acts around the axis as in Patent Document 3. Therefore, the structure for holding the shielding door in the open state becomes compact, and it does not easily interfere with the release of internal pressure when an abnormal situation occurs.

In addition, when the blowout panel comes off or the rupture disk bursts due to the occurrence of an abnormal situation, the drive device can rotate the shielding door around the axis to close the door. As a result, it is possible to prevent radioactive substances and the like existing in the building from leaking out of the facility.

Further, it is conceivable to increase the total opening area by preparing a plurality of main closing devices and arranging them in close proximity to each other in the horizontal direction. In this case, if the drive device is located on the side of the shield door below the central portion in the vertical direction of the shield door, the drive device is placed upside down by flipping the closing device arranged next to the drive device. Is located on the side of the shielding door above the central portion in the vertical direction of the shielding door. Further, when the drive device is located on the side of the shield door above the central portion in the vertical direction of the shield door, the drive device can be moved upside down by turning the closing device arranged next to it upside down. It will be located on the side of the shielding door below the central part in the vertical direction of the shielding door. That is, in either case, since the drive devices of the adjacent closing devices can be arranged side by side in the vertical direction, the dead space is reduced and the effective opening area is widely secured. As a result, a layout that makes it easy to release the pressure inside the building when an abnormal situation occurs is realized.

The second invention includes an open side elastic member that exerts a repulsive force on the shield door in the open state in the closing direction, and a first lock device that locks the shield door in the open state. It is characterized by.

According to this configuration, when the shielding door is opened, the shielding door is locked by the first locking device. At this time, since the repulsive force acts on the shielding door in the closing direction by the elastic member on the open side, the shielding door is suppressed from shaking and rattling against rolling during an earthquake, for example.

The third invention includes a closing-side elastic member that exerts a repulsive force on the closed door in the opening direction, and a second locking device that locks the closed door. It is characterized by.

According to this configuration, when the shielding door is closed, the shielding door is locked by the second locking device. At this time, since the repulsive force acts on the shielding door in the opening direction by the elastic member on the closing side, the shielding door is suppressed from shaking and rattling against rolling when an earthquake occurs, for example.

In the fourth invention, the support is formed of a frame-shaped frame formed in a frame shape corresponding to the shielding door, and the closing-side elastic member is formed so as to extend along the frame-shaped frame. It is characterized in that it is a gasket interposed between the frame type frame and the shielding door.

According to this configuration, when the shielding door is closed, the closing side elastic member is pressed by the shielding door and the frame formwork and elastically deformed, and the closing side elastic member seals between the shielding door and the frame formwork. Will be done.

In a fifth aspect of the invention, the gasket is attached to one of the frame-shaped frame and the shielding door, and the other of the frame-shaped frame and the shielding door has a ridge portion that contacts an intermediate portion in the width direction of the gasket. Is provided so as to project toward one of the above.

According to this configuration, when the shielding door is closed, the ridge portion abuts on the intermediate portion in the width direction of the gasket, and the contact surface pressure increases.

A sixth invention is provided with the rotational force generator, and a torque limiter output of the rotational force generator is input, and a transmission member for transmitting the rotational force output from the torque limiter in the shaft It is characterized by that.

According to this configuration, the output of the rotational force generator is input to the hinge shaft via the torque limiter and transmission member, thereby rotating the shielding door from the closed state to the open state and vice versa. Becomes possible. When the shielding door is closed or opened, the shielding door is pressed against other members to stop it. At this time, a torque limiter is placed between the rotational force generator and the shielding door. It is possible to prevent an overload from being applied to each part without performing special speed control. That is, the place where the closing device according to the present invention is installed is an environment in which precision equipment such as an inverter cannot be installed due to temperature, humidity, radioactivity, etc., and it is difficult to perform speed control, but a torque limiter is interposed. By doing so, it is possible to perform reliable operation even in such an environment.

Further, for example, when the shielding door tries to rotate around the axis due to rolling during an earthquake, an unreasonable force is applied to the drive device from the output side. At this time, a torque limiter is applied to each part. The force is reduced.

A seventh invention includes a first control device that controls the drive device and the first lock device that locks the shield door in the open state, and the first control device has the shield door in the open state. It is characterized in that the control for operating the drive device and the control for operating the first lock device after a lapse of a predetermined time after the shield door is opened are performed. ..

According to this configuration, the first lock device can be operated after a predetermined time has elapsed after the shield door is opened, so that the first lock device is operated after the shield door is surely opened. It will be.

The eighth invention includes a second control device that controls the drive device and the second lock device that locks the shield door in the closed state, and the second control device has the shield door closed. It is characterized in that the control for operating the drive device and the control for operating the second lock device after a lapse of a predetermined time after the shield door is closed are performed. ..

According to this configuration, the second lock device can be operated after a lapse of a predetermined time after the shield door is closed, so that the second lock device is operated after the shield door is surely closed. It will be.

A ninth aspect of the present invention is characterized in that it includes a storage box for accommodating the rotational force generator and a heat insulating material disposed inside the storage box.

According to this configuration, by storing the rotational force generator in a storage box having heat insulating properties, it is possible to protect the rotational force generator from external heat. As a result, it is not necessary to use a special motor, and a general-purpose motor can be used.

A tenth aspect of the invention, the output shaft is disposed so as to project in the vertical direction, the driving device includes a drive sprocket fixed to said output shaft, a driven sprocket fixed to said shaft of said hinge The drive sprocket and the transmission member wound around the driven sprocket are provided.

According to this configuration, since the output shaft protrudes in the vertical direction, the transmission member is shielded by a simple configuration in which the transmission member is wound around the drive sprocket fixed to the output shaft and the driven sprocket fixed to the hinge shaft. It becomes possible to rotate the door.

According to the first invention, since the shielding door is rotatably supported around an axis extending in the vertical direction, the shielding door can be held in an open state even when a large load is applied in the vertical direction. Further, since the drive device for driving the shielding door around the axis is arranged on the side of the shielding door below or above the central portion in the vertical direction of the shielding door, a plurality of shielding doors are arranged close to each other. When installed, the drive devices can be arranged side by side in the vertical direction to reduce dead space. As a result, it is possible to realize a layout in which the pressure inside the building can be easily released when an abnormal situation occurs.

According to the second invention, the repulsive force can be applied in the closing direction by the elastic member on the open side while the shield door in the open state is locked. Therefore, for example, the shield door is subjected to rolling during an earthquake. The structure can withstand an earthquake by suppressing the shaking and rattling of the door.

According to the third invention, the repulsive force can be applied in the opening direction by the elastic member on the closing side while the shielding door in the closed state is locked. Therefore, for example, the shielding door against rolling during an earthquake. The structure can withstand an earthquake by suppressing the shaking and rattling of the door.

According to the fourth invention, the closed door and the frame type frame can be sealed by the closed side elastic member.

According to the fifth invention, a gasket is attached to one of the frame type frame and the shielding door, and a ridge portion is provided on the other so that the gasket is brought into contact with the intermediate portion in the width direction, so that the sealing property can be improved. it can.

According to the sixth invention, since the drive device includes a torque limiter, it is possible to prevent damage by preventing overload on each part when opening / closing or when an earthquake occurs.

According to the seventh invention, since the lock device can be operated after the shield door is surely opened, the shield door can be surely locked in the open state.

According to the eighth invention, since the locking device can be operated after the shielding door is securely closed, the shielding door can be reliably locked in the closed state.

According to the ninth invention, since the arranged insulation inside the storage box for storing the rotational force generator, it can protect the rotational force generator from external heat, failure due to heat of the rotational force generator Can be prevented.

According to the tenth invention, since the output shaft of the drive device protrudes in the vertical direction, the transmission member is simply wound around the drive sprocket fixed to the output shaft and the driven sprocket fixed to the hinge shaft. The shield door can be switched between the open state and the closed state with various configurations.

It is the schematic of the nuclear power generation facility provided with the closing device which concerns on embodiment of this invention. FIG. 5 is a perspective view showing a case where the closing devices according to the embodiment are used side by side vertically and horizontally, and each closing device is in the closed state. It is a figure corresponding to FIG. 2 when the closing device is in an open state. It is a block diagram of a closing device. It is a front view of one closing device. It is a front view which shows the case where two closing devices are arranged close to each other to the left and right. It is a top view which shows the case where two closing devices are arranged close to each other to the left and right. It is a side view of the closing device in a closed state. It shows the case where the closing device is in an open state, and is the cross-sectional view corresponding to line IX-IX in FIG. FIG. 5 is a cross-sectional view taken along line X-X in FIG. It is an enlarged view of the part A of FIG. FIG. 5 is a sectional view taken along line XII-XII in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is essentially merely an example and is not intended to limit the present invention, its application or its use.

(Structure of nuclear power generation facility 100)
FIG. 1 is a side view of a nuclear power plant 100 provided with a closing device according to an embodiment of the present invention. The nuclear power generation facility 100 includes a reactor building 102 in which the reactor pressure vessel 101 is stored, a turbine building 104 in which a turbine device 103 rotated by steam pumped from the reactor pressure vessel 101 is stored, and a reactor building 102. It is equipped with an MS tunnel chamber 105 that connects the reactor building 104 and the turbine building 104. A main steam pipe 106 is connected to the reactor pressure vessel 101, and the main steam pipe 106 extends through the MS tunnel chamber 105 to the turbine building 104 and is connected to the turbine device 103.

An operation floor 102a is provided on the top floor of the reactor building 102. An opening 102b is formed on the wall of the operation floor 102a of the reactor building 102 to release internal pressure in the event of an abnormal situation such as when the main steam pipe 106 or the like ruptures. Further, on the wall of the operation floor 102a, when the pressure inside the reactor building 102 rises abnormally, the blow is pushed out of the reactor building 102 and released to release the internal pressure from the opening 102a. A safety device called an out panel (BOP) 110 is provided. Instead of the blowout panel 110, a safety device such as a rupture disk that releases internal pressure by bursting itself can be provided. Since the blowout panel 110 and the rupture disc have been well known in the past, detailed description thereof will be omitted.

Further, an operation floor 104a is also provided on the uppermost floor of the turbine building 104, and an opening (not shown) for releasing internal pressure in the event of an abnormal situation is formed on the wall of the operation floor 104a. At the same time, a safety device such as a blowout panel or a rupture disc can be provided.

Further, although not shown, the wall of the MS tunnel chamber 105 is also provided with an opening for releasing internal pressure when an abnormal situation occurs, and a safety device such as a rupture disk can be provided. The MS tunnel chamber 105 is also called a main steam pipe tunnel chamber (MSIV chamber).

(Function and arrangement of closing device 1)
When an abnormal situation occurs in the reactor building 102 and the internal pressure exceeds a predetermined value, the blowout panel 110 comes off or the rupture disk bursts and the opening 102b is opened. Similarly, in the turbine building 104 and the MS tunnel chamber 105, when the internal pressure exceeds a predetermined value, the blowout panel 110 comes off or the rupture disk bursts and the opening is opened. This can prevent large-scale damage to the reactor building 102, turbine building 104 and MS tunnel chamber 105, but if the blowout panel 110 remains detached or the rupture disk remains ruptured, There is a risk that radioactive materials in the buildings 102 and 104 and in the MS tunnel room 105 will continue to leak out of the facility. On the other hand, the closing device 1 shown in FIGS. 2 and 3 can be provided in the buildings 102, 104 and the MS tunnel room 105, and the opening 102b opened when an abnormality occurs can be closed by the closing device 1. To do so. FIG. 2 shows a closed state in which the opening 102b opened when an abnormal situation occurs is closed, and FIG. 3 shows a normal state (open state).

As shown in FIGS. 2 and 3, the closing device 1 may be provided on the indoor side of the reactor building 102 or on the outdoor side of the building. When the closing device 1 is provided on the walls of the turbine building 104 and the MS tunnel chamber 105, it may be provided inside the wall or outside the wall in the same manner. Further, the closing device 1 can be attached to an airtight wall 200 provided inside the wall of the reactor building 102. As shown in FIG. 3, the airtight wall 200 is formed with an opening 201 corresponding to the opening 102b formed in the wall of the reactor building 102. Therefore, when the closing device 1 is in the open state, the opening 201 of the airtight wall 200 and the opening 102b of the wall of the reactor building 102 are opened, so that the pressure when an abnormal situation occurs is , The opening 201 of the airtight wall 200 and the opening 102b of the wall of the reactor building 102 can escape to the outside. The airtight wall 200 does not have to be a complete wall structure, and may be formed by combining, for example, frame-shaped members.

The closing device 1 can be provided so as to be arranged in the vertical direction and can be provided so as to be arranged in the horizontal direction. The larger the number of closing devices 1 provided, the larger the effective opening area can be. The effective opening area can be set to be substantially the same as the opening 102b of the wall of the reactor building 102. It is conceivable to increase the effective opening area by increasing the size of the closing device 1, but since the workability during manufacturing, transportation, and installation deteriorates, in the present embodiment, these workability are not significantly impaired. As described above, a plurality of relatively small closing devices 1 are used, and they are arranged in a state of being close to each other so as to obtain a desired effective opening area. A gap may or may not be provided between the adjacent closing devices 1.

In particular, a plurality of pipes such as the main steam pipe 106 penetrate through the wall of the MS tunnel chamber 105, and it is difficult to provide a large closing device 1 on this wall due to the layout. Therefore, a small closing device A plurality of 1's are provided. As a result, the closing device 1 can be laid out to obtain a desired effective opening area while avoiding the main steam pipe 106 and the like.

In the following description, a case where the closing device 1 is provided on the wall of the reactor building 102 will be described, but the present invention can also be applied to the turbine building 104 and the MS tunnel chamber 105. In the description of this embodiment, as shown in each figure, the inside of the reactor building 102 is simply referred to as the inside, the outside of the reactor building 102 is simply referred to as the outside, and when facing from the inside to the outside, it is to the right. The side that becomes the left side is simply called the right side, and the side that becomes the left side when facing from the inside to the outside is simply called the left side.

(Structure of closing device 1)
As shown in FIG. 5, the closing device 1 includes a shielding door 10 that closes the opening 102b of the wall of the reactor building 102, a frame-shaped frame 20 as a support for supporting the shielding door 10, and the shielding door 10. The first hinge 31 and the second hinge 32 supported on the frame type frame 20, the drive device 40 for driving the shielding door 10, the control device 50 shown in FIG. 4, the operation switch 51, the open side limit switch 52, and the like. It includes a closing side limit switch 53, a locking side limit switch 54, an unlocking side limit switch 55, an open state holding member 60 (shown in FIGS. 8 and 9), and a closing state holding member 70.

The lock-side limit switch 54 is a switch that detects that the first cannuki 11 and the second cannuki 12 are in the locked position. The unlock side limit switch 55 is a switch that detects that the first cannuki 11 and the second cannuki 12 are in the unlocked position. When the shielding door 10 changes from the locked state in the open state to the locked state in the closed state, the electric motor 41 is first driven to further press the shielding door 10 in the open position in the opening direction. When a predetermined time (for example, 1 second) elapses after the electric motor 41 starts outputting in the opening direction, the cannuki drive device 13 is driven in the unlocking direction, and the first cannuki 11 and the second cannuki 12 move to the unlocked position. To start. When the unlock side limit switch 55 is closed, the pressing of the electric motor 41 in the opening direction is stopped, and the driving of the Kannuki drive device 13 in the unlocking direction is also stopped. After that, it operates so that the shielding door is closed.

When the shielding door 10 changes from the locked state in the closed state to the locked state in the open state, the electric motor 41 is first driven to further press the shielding door 10 in the closed position in the closing direction. .. When a predetermined time (for example, 1 second) elapses after the electric motor 41 starts outputting in the closing direction, the cannuki drive device 13 is driven in the unlocking direction, and the first cannuki 11 and the second cannuki 12 move to the unlocked position. To start. When the unlock side limit switch 55 is closed, the pressing of the electric motor 41 in the closing direction is stopped, and the driving of the Kannuki drive device 13 in the unlocking direction is also stopped. After that, the shielding door 10 is operated so as to be in the open state.

As shown in FIG. 3, the frame type frame 20 is a member attached to the airtight wall 200. A plurality of openings 201 are formed in the airtight wall 200. FIG. 3 shows an example in which six openings 201 are formed in the airtight wall 200, but the number and arrangement of the openings 201 are not limited to those shown in FIG. The airtight wall 200 is provided with a support column 202 extending in the vertical direction and a horizontal partition 203 extending in the horizontal direction in order to form a plurality of openings 201. The strut portion 202 is formed so that the openings 201 are arranged in the horizontal direction, and the horizontal partition portion 203 is formed so that the openings 201 are arranged in the vertical direction.

As shown in FIG. 3, the frame type frame 20 is provided on the first frame material 21 extending in the horizontal direction along the upper edge of the opening 201 of the airtight wall 200 and the lower edge of the opening 201 of the airtight wall 200. On the second frame material 22 extending horizontally along the third frame material 23 extending vertically along the left edge of the opening 201 of the airtight wall 200, and on the right edge of the opening 201 of the airtight wall 200. It is provided with a fourth frame material 24 extending in the vertical direction along the line. The upper end of the third frame material 23 is connected to the left end of the first frame material 21, and the upper end of the fourth frame material 24 is connected to the right end of the first frame material 21. Further, the lower end of the third frame material 23 is connected to the left end of the second frame material 22, and the lower end of the fourth frame material 24 is connected to the right end of the second frame material 22. As a result, a frame-shaped frame 20 having a rectangular frame shape long in the vertical direction is configured so as to correspond to the shape of the shielding door 10. As shown in FIG. 5, the width of the fourth frame material 24 is set wider than the widths of the first frame material 21, the second frame material 22, and the third frame material 23. The frame type frame 20 may have a rectangular shape that is long in the left-right direction.

As shown in FIGS. 7 and 10, a gasket (closing side elastic member) 25 interposed between the frame type frame 20 and the shielding door 10 is provided on the inner side surface of the frame type frame 20. The gasket 25 is formed in a rectangular shape extending along the first frame material 21, the third frame material 23, the second frame material 22, and the fourth frame material 24 of the frame type frame 20, and the entire frame type frame 20 is formed. It is continuous over the circumference. The gasket 25 is made of an elastic material such as rubber or a thermoplastic elastomer, and is formed in a hollow shape as shown in FIG. The frame 20 side of the gasket 25 is fixed to the frame 20 via a fixing member 26. When the shielding door 10 is in the open state, the shielding door 10 is not in contact with the gasket 25, and the gasket 25 has a shape as shown by a virtual line in FIG.

As shown in FIGS. 2, 3 and 5, the shielding door 10 has a rectangular shape that is long in the vertical direction as a whole, and has an outer shape that is larger than the inner shape of the frame type frame 20. When the shielding door 10 is in the closed state, the entire inside of the frame type frame 20 can be closed by the shielding door 10.

As shown in FIG. 5, a first hinge 31 and a second hinge 32 are interposed between the shielding door 10 and the fourth frame member 24 of the frame type frame 20. The first hinge 31 is a member that supports a portion above the central portion in the vertical direction of the shielding door 10, and the second hinge 32 is a member that supports a portion below the central portion in the vertical direction of the shielding door 10. Is. The number of hinges is not limited to two, and may be three or more.

The first hinge 31 has a door-side fixing plate 31a fixed to the inner surface side of the shielding door 10, a frame-side fixing plate 31b fixed to the frame-type frame 20, and a vertical direction fixed to the door-side fixing plate 31a. It has an extending shaft 31c. In this embodiment, the upper portion of the shaft 31c is fixed so as not to rotate relative to the door side fixing plate 31a, and the lower portion of the shaft 31c is rotatably supported with respect to the frame side fixing plate 31b. Has been done. The second hinge 32 has a door-side fixing plate 32a fixed to the inner surface side of the shielding door 10, a frame-side fixing plate 32b fixed to the frame-type frame 20, and a vertical direction fixed to the door-side fixing plate 32a. It has an extending shaft 32c. In this embodiment, the lower portion of the shaft 32c is fixed so as not to rotate relative to the door side fixing plate 32a, and the upper portion of the shaft 32c is rotatably supported with respect to the frame side fixing plate 32b. Has been done. The lower portion of the shaft 32c is formed so as to project downward from the door-side fixing plate 32a. The first hinge 31 and the second hinge 32 can switch between a closed state in which the shielding door 10 is rotatably supported around the shafts 31c and 32c to close the opening 102b and an open state in which the opening 102b is opened. It has become. The structures of the first hinge 31 and the second hinge 32 described above are examples, and any hinge may have any structure, but the shaft of the upper hinge and the shaft of the lower hinge are opposite to each other. By adopting the protruding structure, for example, it is possible to prevent the shielding door 10 from moving in the vertical direction with respect to the frame type frame 20 at the time of an earthquake, and it is possible to improve the earthquake resistance.

As shown in FIG. 11, the peripheral edge of the shielding door 10 is provided with a ridge portion 16 that comes into contact with the widthwise intermediate portion of the gasket 25 when the shielding door 10 is in the closed state. The ridge portion 16 projects from the outer surface of the shielding door 10 in a direction approaching the frame type frame 20, and extends in a continuous annular shape along the peripheral edge portion of the shielding door 10. As shown in FIG. 12, the amount of protrusion of the ridge portion 16 allows the gasket 25 to be elastically deformed when the shielding door 100 is in the closed state so as to be brought into close contact with the tip portion of the ridge portion 16. In that state, the gasket 25 is set so as not to cause bottoming out. When the tip end portion of the ridge portion 16 comes into contact with the intermediate portion in the width direction of the gasket 25, the contact surface pressure is increased, whereby the sealing property can be improved. When the shielding door 10 is in the closed state and the ridge portion 16 comes into contact with the gasket 25, the gasket 25 exerts a repulsive force in the opening direction on the shielding door 10 in the closed state. Further, although not shown, a gasket may be provided on the shielding door 10 and a ridge portion may be provided on the frame type frame 20.

As shown in FIG. 5 and the like, the shielding door 10 is provided with a first cannuki 11 and a second cannuki 12. The first cannuki 11 is supported so as to be movable in the vertical direction with respect to a portion of the shielding door 10 distant from the first hinge 31, and has a locking position protruding upward from the upper end of the shielding door 10 and the shielding door 10. It can be switched to a non-locking position located below the upper end. The second cannuki 12 is supported so as to be movable in the vertical direction with respect to a portion of the shielding door 10 away from the second hinge 32, and has a locking position protruding downward from the lower end of the shielding door 10 and the shielding door 10. It can be switched to a non-locking position located above the lower end.

The shielding door 10 is provided with a cannuki drive device 13 for driving the first cannuki 11 and the second cannuki 12. The Kannuki drive device 13 is composed of, for example, an electric motor and a well-known cam mechanism that converts the rotational motion of the electric motor into a linear motion in the vertical direction. By rotating the electric motor in a predetermined direction by a predetermined amount, the first is The first cannuki 11 and the second cannuki 12 can be set to the locked position, and the first cannuki 11 and the second cannuki 12 in the locked position can be set to the unlocked position by reversing the electric motor. it can. The Kannuki drive device 13 can also be configured by, for example, a linear actuator, a ball screw mechanism, or the like.

The first cannuki 11, the second cannuki 12, and the cannuki drive device 13 constitute a second lock device that locks the shield door 10 in the closed state, and a first lock device that locks the shield door 10 in the open state. Is configured. The lock device that locks the shield door 10 in the closed state and the lock device that locks the shield door 10 in the open state may be the same or may be configured separately. Since the closed state and the open state can be locked by the same first cannuki 11 and second cannuki 12, the structure can be simplified as compared with the case where separate cannuki are provided.

A closed state holding member 70 is provided on each of the first frame material 21 and the second frame material 22 of the frame type frame 20. The closed state holding member 70 of the first frame member 21 is arranged directly above the first cannuki 11 of the shield door 10 in the closed state, and when the first cannuki 11 protrudes upward and becomes a locking position. It has a cannuki insertion hole 70a to be inserted into. When the first cannuki 11 is inserted into the cannuki insertion hole 70a from below, the first cannuki 11 is locked to the closed state holding member 70 of the first frame member 21. Further, the closed state holding member 70 of the second frame member 22 is arranged directly below the second cannuki 12 of the shield door 10 in the closed state, and the second cannuki 12 projects downward to be in the locking position. It has a cannuki insertion hole 70a to be inserted at the time. When the second cannuki 12 is inserted into the cannuki insertion hole 70a from above, the second cannuki 12 is locked to the closed state holding member 70 of the second frame member 22. The shielding door 10 is held in the closed state by engaging the first cannuki 11 and the second cannuki 12 with the closed state holding member 70 of the first frame material 21 and the closed state holding member 70 of the second frame material 22. ..

On the other hand, as shown in FIG. 8, the airtight wall 200 is provided with lateral members 210 and 210 extending inward at intervals in the vertical direction so as to correspond to the height dimension of the closing device 1. The inner ends of the horizontal members 210 and 210 are fixed to the vertical members 211 arranged inwardly away from the airtight wall 200. Further, the inner ends of the horizontal members 210 and 210 are connected to each other by a connecting member 212 extending in the vertical direction.

The upper and lower lateral members 210 and 210 are each provided with an open state holding member 60. The open state holding member 60 of the upper horizontal member 210 is arranged directly above the first cannuki 11 of the shielding door 10 in the open state, and when the first cannuki 11 protrudes upward and becomes a locking position. It has a cannuki insertion hole 60a to be inserted into the door. When the first cannuki 11 is inserted into the cannuki insertion hole 60a from below, the first cannuki 11 is locked to the open state holding member 60 of the upper lateral member 210. Further, the open state holding member 60 of the lower lateral member 210 is arranged directly below the second cannuki 12 of the shielding door 10 in the open state, and the second cannuki 12 projects downward to the locking position. It has a cannuki insertion hole 60a to be inserted when it becomes. When the second cannuki 12 is inserted into the cannuki insertion hole 60a from above, the second cannuki 12 is locked to the open state holding member 60 of the lower lateral member 210. The shielding door 10 is held in the open state by locking the first cannuki 11 and the second cannuki 12 to the upper and lower open state holding members 60.

As shown in FIG. 5, an open side limit switch 52 and a closing side limit switch 53 are provided on the upper portion of the shielding door 10. The open side limit switch 52 is provided closer to the first hinge 31 than the first cannuki 11, and has a first rod-shaped portion 52a arranged so as to project upward from the upper end portion of the shielding door 10. ing. The first rod-shaped portion 52a is provided so as to be movable in the vertical direction with respect to the main body of the open side limit switch 52, and is constantly urged upward by an urging member such as a spring (not shown) and protrudes upward. Is to be maintained. Further, the closing side limit switch 53 is provided on the side far from the first hinge 31, and has a second rod-shaped portion 53a arranged so as to project upward from the upper end portion of the shielding door 10. Like the first rod-shaped portion 52a, the second rod-shaped portion 53a is constantly urged upward by an urging member.

The first frame material 21 of the frame type frame 20 is provided with a closing side contact member 71. The closing side contact member 71 is arranged directly above the closing side limit switch 53 of the shielding door 10 in the closed state, and comes into contact with the second rod-shaped portion 53a of the closing side limit switch 53 to contact the second rod-shaped portion. It is a member for pushing 53a downward. Therefore, when the shielding door 10 is in the closed state, the second rod-shaped portion 53a of the closing side limit switch 53 abuts on the closing side contact member 71 and is pushed downward, whereby the closing side limit switch 53 is closed. On the other hand, when the shielding door 10 is opened, the second rod-shaped portion 53a moves upward and the closing side limit switch 53 opens. The opening and closing of the closing side limit switch 53 may be reversed.

It is also possible to provide an interlock function that operates as follows. For example, when all of the following conditions are satisfied, the operation of locking the shielding door 10 in the open state can be started. If each switch is operated while the following conditions are not met, a buzzer or the like is sounded to notify the user, although not shown.
Condition 1: The open side limit switch 52 is OFF or the lock side limit switch 54 is OFF.
Condition 2: The electric motor 41 is stopped Condition 3: The Kannuki drive device 13 is stopped When all of the following conditions are satisfied, the shielding door 10 can be started to lock in the closed state. If each switch is operated while the following conditions are not met, a buzzer or the like is sounded to notify the user.
Condition 1: The closing side limit switch 53 is OFF or the lock side limit switch 54 is OFF.
Condition 2: The electric motor 41 is stopped Condition 3: The Kannuki drive device 13 is stopped As shown in FIG. 8, the lateral member 210 on the upper side of the airtight wall 200 is provided with the open side contact member 61. The open-side abutting member 61 is arranged directly above the open-side limit switch 52 of the shield door 10 in the open state, and comes into contact with the first rod-shaped portion 52a of the open-side limit switch 52 to contact the first rod-shaped portion. It is a member for pushing 52a downward. Therefore, when the shielding door 10 is in the open state, the first rod-shaped portion 52a of the open side limit switch 52 abuts on the open side contact member 61 and is pushed downward, whereby the open side limit switch 52 is closed. On the other hand, when the shielding door 10 is closed, the first rod-shaped portion 52a moves upward and the open side limit switch 52 opens. The opening and closing of the open side limit switch 52 may be reversed.

The open side limit switch 52 and the closed side limit switch 53 are open / closed state detection units that detect the open / closed state of the shielding door 10. Although not shown, the open / closed state detection unit may be composed of a sensor or the like other than the limit switch. Further, the location where the open / closed state detection unit is arranged is not limited to the upper side of the shielding door 10, but may be the lower side or the intermediate portion in the vertical direction. Further, the open / closed state detection unit may be provided on the hinges 31, 32 and the like.

As shown in FIG. 5, on the side of the shielding door 10 away from the hinges 31 and 32, an opening-side elastic member 18 for applying a repulsive force in the closing direction to the shielding door 10 in the open state is provided. Has been done. The open-side elastic members 18 are arranged at the upper end and the lower end of the inner surface of the shielding door 10, respectively, and are formed so as to project from the inner surface. Examples of the material constituting the open-side elastic member 18 include rubber, a thermoplastic elastomer, and a spring. As shown by a virtual line in FIG. 7, when the shielding door 10 is in the open state, the protruding end portion of the open side elastic member 18 comes into contact with the lateral member 210 of the airtight wall 200, whereby the shielding door in the open state It acts so as to exert a repulsive force on 10 in the closing direction.

As shown in FIG. 5, on the inner surface side of the shielding door 10, a main body portion of the opening side limit switch 52 and the closing side limit switch 53, and a storage box 14 for accommodating the Kannuki drive device 13 are provided. As shown in FIG. 10, the storage box 14 is provided so as to reach the lower end portion from the upper end portion of the shielding door 10. Although not shown in FIG. 10, the storage box 14 is formed so as to be able to store the first cannuki 11 and the second cannuki 12 in the unlocked position. Further, as shown in FIG. 10, the storage box 14 is provided on the side of the shielding door 10 away from the first hinge 31 and the second hinge 32. Inside the storage box 14, a heat insulating material 14a is arranged so as to cover the inner surface of the storage box 14. The heat insulating material 14a is arranged so as to come into contact with the side wall portion of the storage box 14 and the wall located inside. The heat insulating material 14a is made of glass wool or the like, which has been well known in the past. As a result, it becomes possible to protect the main body portion of the open side limit switch 52 and the closed side limit switch 53 and the cannuki drive device 13 from heat. Further, an oil seal may be attached to the shaft penetrating portion of the first rod-shaped portion 11, the second cannuki 12, the first rod-shaped portion 52a, the second rod-shaped portion 53a in the storage box 14, and the shaft penetrating portion of the output shaft 43a of the storage box 4. it can. This protects the electrical components from heat and moisture.

As shown in FIG. 10, the storage box 14 is provided with a lid member 14b that closes the emergency opening. The lid member 14b is normally attached to the storage box 14, but for example, when the Kannuki drive device 13 does not operate, the lid member 14b can be removed to open the emergency opening. For example, it is possible to operate the Kannuki drive device 13 by inserting a tool or the like into the inside of the storage box 14 through the emergency opening.

(Structure of drive device 40)
The drive device 40 is for driving the shielding door 10 around the shafts 31c and 32c of the first hinge 31 and the second hinge 32, and as shown in FIG. 5, the electric motor 41 constituting the rotational force generator A speed reducer 42, a torque limiter 43 into which the output of the speed reducer 42 is input, and a storage box 47 for storing these are provided. The storage box 47 is arranged on the right side of the shielding door 10, and in this embodiment, it is located adjacent to the right side of the fourth frame member 24 of the frame type frame 20. The storage box 47 has a shape that is long in the vertical direction. The upper end of the storage box 47 is the upper end of the drive device 40, and is located below the central portion of the shielding door 10 in the vertical direction. As a result, the drive device 40 is arranged on the side of the shielding door 10 below the central portion in the vertical direction of the shielding door 10.

The electric motor 41 has a posture in which the rotation shaft extends in the vertical direction, and is arranged on the upper side in the storage box 47. The speed reducer 42 is a well-known gear speed reducer, and has a posture in which the rotation shaft extends in the vertical direction, and is arranged in the intermediate portion in the vertical direction in the storage box 47, that is, below the electric motor 41. The rotational force of the electric motor 41 is input to the speed reducer 42 and output from the speed reducer 42. The torque limiter 43 has been well known in the past, and is configured to be able to mechanically cut off the transmission of torque when a torque equal to or higher than a predetermined value is applied. The structure of the torque limiter 43 is not particularly limited, and various torque limiters can be used.

The torque limiter 43 is arranged on the lower side in the storage box 47, that is, below the speed reducer 42. The output shaft of the speed reducer 42 is connected to the input side of the torque limiter 43. Further, an output shaft 43a is connected to the output side of the torque limiter 43. The output shaft 43a projects downward from the lower wall of the storage box 47. A drive sprocket 44 is fixed to the lower end of the output shaft 43a. A driven sprocket 45 is fixed to the lower end of the shaft 32c of the second hinge 32. The drive sprocket 44 and the driven sprocket 45 are arranged at the same height. A transmission chain (transmission member) 46 made of a roller chain or the like is wound around the drive sprocket 44 and the driven sprocket 45. The output shaft 43a, the drive sprocket 44, the driven sprocket 45, and the transmission chain 46 are members that constitute the drive device 40.

Therefore, the rotational force of the electric motor 41 is input to the torque limiter 43 after being increased by the speed reducer 42, and the rotational force output from the torque limiter 43 acts to rotate the drive sprocket 44 via the output shaft 43a. To do. When the drive sprocket 44 rotates, the driven sprocket 45 rotates via the transmission chain 46, and the rotational force of the driven sprocket 45 is transmitted to the shaft 32c of the second hinge 32. Since the shaft 32c is fixed to the door-side fixing plate 32a, the shielding door 10 can be rotated by the rotational force of the shaft 32c. The rotation direction of the shielding door 10 can be changed by switching the rotation direction of the electric motor 41.

As shown in FIGS. 10 and 12, a heat insulating material 47a is arranged inside the storage box 47. The heat insulating material 47a is configured in the same manner as the heat insulating material 14a of the storage box 14, and is arranged so as to come into contact with the side wall portion of the storage box 47 and the wall located inside. This makes it possible to protect the electric motor 41, the reduction gear 42, and the torque limiter 43 from heat. The heat insulating material 47a is also a member constituting the drive device 40. In FIGS. 10 and 12, the electric motor 41, the speed reducer 42, and the torque limiter 43 are omitted.

(Configuration of control device 50)
The control device 50 shown in FIG. 4 is for controlling the electric motor 41 and the Kannuki drive device 13 of the drive device 40. An operation switch 51, an open side limit switch 52, and a closed side limit switch 53 are connected to the control device 50. The operation switch 51 is a switch for opening and closing the shielding door 10, but is not limited to this, and the shielding door 10 can be received in any trigger signal, and the shielding door 10 is opened or closed by receiving a predetermined trigger signal. You may choose to. Further, the control device 50 can determine whether the shielding door 10 is in the open state or the closed state by detecting the open / closed state of the open side limit switch 52 and the closed side limit switch 53.

When the control device 50 detects the operation of the operation switch 51 and closes the shield door 10 in the open state, the cannuki drive device 13 is operated to unlock the first cannuki 11 and the second cannuki 12. After the position is set, the rotation control in the closing direction is performed on the electric motor 41 of the drive device 40. As a result, the shielding door 10 rotates in the closing direction, and the closing side limit switch 53 is eventually closed by the closing side contact member 71.

When the closing side limit switch 53 is closed, it means that the shielding door 10 is in the closed state. Therefore, the control device 50 detects when the shielding door 10 is closed by the closing side limit switch 53. Can be done. For example, the drive device 40 is operated in the direction of closing the shielding door 10, and the lock device 13 is operated after a predetermined time has elapsed after the closing side limit switch 53 detects that the shielding door 10 is in the closed state. Can be made to. This can be done with the second controller. For example, the control device 50 can operate the drive device 40 until the lock side limit switch 54 is closed after the shielding door 10 is closed, so that the shielding door 10 is held in the closed state. However, the cannuki drive device 13 can be operated after a lapse of a predetermined time. Therefore, the drive device 40 can be operated until the shield door 10 is closed and the lock side limit switch 54 is closed, and the cannuki drive device 13 is pressed while the shield door 10 is securely pressed against the closed side elastic member 25. Can be activated. When the shielding door 10 is closed, the torque limiter 42 is interposed between the torque limiter 42 and the electric motor 41, so that the rotation of the electric motor 41 is allowed by the action of the torque limiter 42. While the electric motor 41 rotates, the shielding door 10 is pressed against the gasket 25.

When a predetermined time (for example, 2 seconds) has elapsed after the detection of the closing side limit switch 53, the cannuki drive device 13 is operated so as to lock the first cannuki 11 and the second cannuki 12. That is, by continuing to apply a force in the closing direction by the drive device 40 to the shield door 10 in the closed state for a predetermined time, the shield door 10 is surely closed, and then the first cannuki 11 and the second By setting the cannuki 12 in the locking position, the shielding door 10 is securely locked in the closed state.

Further, when the control device 50 detects the operation of the operation switch 51 and opens the closed shield door 10, the Kannuki drive device 13 is operated to deactivate the first Kannuki 11 and the second Kannuki 12. After the locking position is set, the rotation control of the electric motor 41 of the drive device 40 in the opening direction is performed. As a result, the shielding door 10 rotates in the opening direction, and eventually the opening side limit switch 52 is closed by the opening side contact member 61.

When the open side limit switch 52 is closed, it means that the shielding door 10 is in the open state. Therefore, the control device 50 detects when the shielding door 10 is opened by the open side limit switch 52. Can be done. For example, the drive device 40 is operated in the direction of opening the shield door 10, and the lock device 13 is operated after a predetermined time has elapsed after the open side limit switch 52 detects that the shield door 10 is in the open state. Can be made to. This can be done with the first controller. The first control device and the second control device may not be separated, and may be configured by one control device. For example, the control device 50 operates the drive device 40 until the lock side limit switch 54 is closed after the shielding door 10 is opened, so that the shielding door is kept in the open state while being operated. The cannuki drive device 13 can be operated after a lapse of a predetermined time. Therefore, the drive device 40 can be operated until the shield door 10 is opened and the lock side limit switch 54 is closed, and the cannuki drive device 13 is pressed while the shield door 10 is securely pressed against the open side elastic member 18. Can be activated. When the shielding door 10 is opened, the torque limiter 42 is interposed between the torque limiter 42 and the electric motor 41, so that the rotation of the electric motor 41 is allowed by the action of the torque limiter 42. While the electric motor 41 rotates, the elastic member 18 on the open side of the shielding door 10 is pressed against the lateral member 210 of the airtight wall 200.

When a predetermined time (for example, 2 seconds) has elapsed after the detection of the open side limit switch 52, the cannuki drive device 13 is operated so as to lock the first cannuki 11 and the second cannuki 12. That is, by continuing to apply a force in the closing direction by the drive device 40 to the shield door 10 in the open state for a predetermined time, the shield door 10 is surely opened, and then the first cannuki 11 and the second By setting the cannuki 12 in the locking position, the shielding door 10 is securely locked in the open state.

(Layout of closing device 1)
As shown in FIG. 6, when two closing devices 1 arranged so as to be adjacent to each other in the horizontal direction are viewed, the top and bottom of the closing device 1 on the left side are inverted with respect to the closing device 1 on the left side. Can be used as the closing device 1 on the right side. In the closing device 1 on the left side of FIG. 6, the first frame material 21 of the frame type frame 20 is located on the upper side, the second frame material 22 is located on the lower side, the third frame material 23 is located on the left side, and the fourth frame material 24 is located on the right side. On the other hand, the opening / closing device 1 on the right side of FIG. 6 has the top and bottom inverted, so that the first frame material 21 of the frame type frame 20 is on the bottom, the second frame material 22 is on the top, and the third frame material 23 is on the top. Is located on the right and the fourth frame member 24 is located on the left. One opening closing unit can be configured by the closing device 1 on the left side and the closing device 1 on the right side shown in FIG.

Further, as shown in FIG. 5, the drive device 40 of the closing device 1 is arranged on the right side of the shield door 10 below the central portion in the vertical direction of the shield door 10, and is located above the drive device 40. Is a space that can be a dead space S. As shown in FIG. 6, by using the upside-down closing device 1 as the closing device 1 on the right side, the driving device 40 of the closing device 1 on the right side moves up and down the shielding door 10 on the left side of the shielding door 10. It will be placed above the center of the direction. Therefore, since the driving device 40 of the closing device 1 on the right side can be arranged above the driving device 40 of the closing device 1 on the left side, the dead space S can be effectively utilized and the closing device 1 on the left side and the closing device 1 on the right side can be closed. The device 1 can be arranged so as to be close to each other in the left-right direction.

Further, since the drive device 40 of the closing device 1 on the right side has the drive sprocket 44, the driven sprocket 45, and the transmission chain 46 above it, it does not interfere with the drive device 40 of the closing device 1 on the left side. ..

(Action and effect of the embodiment)
As described above, according to the closing device 1 according to this embodiment, the shielding door 10 is rotatably supported by the frame-shaped frame 20 by the shafts 31c and 32c, so that the shielding door 10 is normally open. It is possible to secure a wide effective opening area by not blocking the opening 102a located next to the main closing device 1.

Further, since the shafts 31c and 32c supporting the shielding door 10 extend in the vertical direction, the direction of the load is the axial direction even if a large load is applied in the vertical direction. This makes it possible to hold the shielding door 10 in an open state without forming a large-scale structure as compared with the case where it acts around the shaft. Therefore, the structure for holding the shielding door 10 in the open state becomes compact, and it does not easily interfere with the release of internal pressure when an abnormal situation occurs. Further, in the open state, the shielding door 10 stands by at a position perpendicular to the frame type frame 20, so that the pressure in an abnormal situation can be prevented from being directly received.

Further, when the blowout panel 110 comes off or the rupture disk bursts due to the occurrence of an abnormal situation, the shielding door 10 can be rotated around the shafts 31c and 32c by the drive device 40 to be closed. become. As a result, it is possible to prevent radioactive substances and the like existing in the buildings 102 and 104 from leaking to the outside of the facility.

Further, as shown in FIG. 6, the total opening area can be increased by preparing a plurality of closing devices 1 and arranging them so close to each other in the horizontal direction. In this case, since the drive device 40 is located on the side of the shield door 10 below the central portion in the vertical direction of the shield door 10, the closing device 1 arranged next to the drive device 1 is turned upside down. The drive device 40 is located on the side of the shielding door 10 above the central portion in the vertical direction of the shielding door 10. Therefore, since the drive devices 40 of the adjacent closing devices 1 can be arranged side by side in the vertical direction, the dead space S is reduced and the effective opening area is widely secured. As a result, a layout is realized in which the pressure inside the buildings 102 and 104 can be easily released when an abnormal situation occurs.

Further, the drive device 40 may be configured to be located on the side of the shielding door 10 above the central portion in the vertical direction of the shielding door 10. In this case, by turning the closing device 1 arranged next to it upside down, the drive device 40 is located on the side of the shielding door 10 below the central portion in the vertical direction of the shielding door 10. Therefore, the drive devices 40 can be arranged side by side in the vertical direction.

Further, when the shielding door 10 is closed, the shielding door 10 is locked by the first cannuki 11 and the second cannuki 12. At this time, since the repulsive force acts on the shielding door 10 in the opening direction by the gasket 25, for example, the shielding door 10 is suppressed from shaking and rattling against rolling when an earthquake occurs. Further, when the shielding door 10 is opened and the shielding door 10 is locked by the first cannuki 11 and the second cannuki 12, a repulsive force acts on the shielding door 10 in the closing direction by the open side elastic member 18. Therefore, the shaking and rattling of the shielding door 10 are similarly suppressed.

Further, the output of the electric motor 41 is input to the shafts 31c and 32c of the hinges 31 and 32 via the torque limiter 43, whereby the shielding door 10 is rotated from the closed state to the open state and vice versa. Can be done. When the shielding door 10 is closed or opened, the shielding door 10 is pressed against other members. At this time, the torque limiter 43 is between the electric motor 41 and the shielding door 10. It is possible to prevent an overload from being applied to each part by interposing.

Further, for example, when the shielding door 10 tries to rotate around the shafts 31c and 32c due to rolling during an earthquake, an unreasonable force is applied to the drive device 40 from the output side. The torque limiter 43 reduces the force applied to each part.

The above embodiments are merely exemplary in all respects and should not be construed in a limited way. Furthermore, all modifications and modifications that fall within the equivalent scope of the claims are within the scope of the present invention.

As described above, the closing device 1 for a nuclear power generation facility according to the present invention can be installed, for example, in a reactor building or an MS tunnel room.

1 Closing device for nuclear power generation facilities 10 Shielding door 20 Frame type frame 11 1st Kannuki 12 2nd Kannuki 13 Kannuki drive device 16 Protruding part 18 Open side elastic member 25 Gasket (closing side elastic member)
31 1st hinge 31c Shaft 32 2nd hinge 32c Shaft 40 Drive unit 41 Electric motor 43 Torque limiter 43a Output shaft 44 Drive sprocket 45 Driven sprocket 46 Transmission chain (transmission member)
47 Storage Box 47a Insulation 50 Control Device 102b Opening 110 Blowout Panel

Claims (10)

In a closing device for a nuclear power plant that closes an opening formed in the wall when the blowout panel or rupture disk provided on the wall constituting the nuclear power facility is opened.
A shielding door that closes the opening and
A support that supports the shielding door and
A closed state in which the shielding door is interposed between the shielding door and the support and has a shaft extending in the vertical direction, and the shielding door is rotatably supported around the shaft to close the opening and the opening A hinge that switches between the open state and the open state,
A nuclear power plant is provided on the side of the shielding door so as to be arranged below or above the central portion in the vertical direction of the shielding door and to drive the shielding door around the axis. Closing device for power generation facilities. In the closing device for a nuclear power generation facility according to claim 1,
An open-side elastic member that exerts a repulsive force in the closing direction on the shield door in the open state,
A closing device for a nuclear power generation facility, which comprises a first locking device that locks the shielding door in an open state. In the closing device for a nuclear power generation facility according to claim 1 or 2.
An elastic member on the closing side that exerts a repulsive force in the opening direction on the shielding door in the closed state,
A closing device for a nuclear power generation facility, which comprises a second locking device that locks the shielding door in a closed state. In the closing device for a nuclear power generation facility according to claim 3,
The support is composed of a frame-shaped frame formed in a frame shape corresponding to the shielding door.
A closing device for a nuclear power generation facility, wherein the closing-side elastic member is formed so as to extend along the frame-shaped frame and is a gasket interposed between the frame-shaped frame and the shielding door. In the closing device for a nuclear power generation facility according to claim 4.
The gasket is attached to one of the frame formwork and the shielding door.
A closure for a nuclear power generation facility, characterized in that a ridge portion abutting on an intermediate portion in the width direction of the gasket is provided on the other side of the frame type frame and the shielding door so as to project toward the one side. apparatus. In the closing device for a nuclear power generation facility according to any one of claims 1 to 5.
The drive device includes a rotational force generator, a torque limiter to which the output of the rotational force generator is input, and a transmission member for transmitting the rotational force output from the torque limiter to the shaft of the hinge. A closing device for nuclear power generation facilities, which is characterized by being In the closing device for a nuclear power generation facility according to claim 6.
A first control device for controlling the drive device and the first lock device for locking the shield door in the open state is provided.
The first control device includes a control for operating the drive device until the shield door is opened, and a control for operating the first lock device after a lapse of a predetermined time after the shield door is in the open state. A closure device for a nuclear power plant, characterized in that it is configured to perform. In the closing device for a nuclear power generation facility according to claim 6 or 7.
A second control device for controlling the drive device and the second lock device for locking the shield door in the closed state is provided.
The second control device includes a control for operating the drive device until the shield door is closed, and a control for operating the second lock device after a lapse of a predetermined time after the shield door is closed. A closure device for a nuclear power plant, characterized in that it is configured to perform. In the closing device for a nuclear power generation facility according to any one of claims 1 to 8.
The drive device is a closing device for a nuclear power generation facility, which includes an electric motor, a storage box for storing the electric motor, and a heat insulating material disposed inside the storage box. In the closing device for a nuclear power generation facility according to any one of claims 1 to 9.
The drive device includes an output shaft protruding in the vertical direction, a drive sprocket fixed to the output shaft, a driven sprocket fixed to the shaft of the hinge, and a transmission wound around the drive sprocket and the driven sprocket. A closing device for a nuclear power plant, which is characterized by having a chain.

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