JP4581222B2 - Primary containment airlock - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air lock for allowing workers and the like to enter and exit a nuclear reactor containment vessel.
[0002]
[Prior art]
As shown in FIG. 4, a conventional conventional airlock generally includes partition walls 2 at both ends of a cylindrical airlock cylinder 1 that penetrates a concrete wall A of a reactor containment vessel substantially horizontally and communicates with the inside and outside of the cylinder. , 2 having rectangular openings 3, 3 at substantially the center of each partition wall 2, 2 and opening and closing the door frames 4, 4 of the openings 3, 3 in the container inward direction, respectively. It has a structure including rectangular airlock doors 5 and 5.
In a normal state, the inside of the container is double-sealed by the pair of inner and outer air lock doors 5 and 5, and when an operator enters and leaves the container, one of the air lock doors 5 is opened by an unillustrated opening / closing mechanism. By opening only the doors alternately, the container is not opened even when workers enter and leave, and a structure that ensures high sealing performance at all times is provided.
[0003]
[Problems to be solved by the invention]
By the way, in the conventional air lock having such a structure, the heights of the bottoms of the door frames 4 and 4 are considerably higher than the floor level L in the air lock cylinder 1, so that there is a large step at that position. This is a factor that hinders the entry and exit of workers and makes it difficult to carry in and out of carts and the like.
[0004]
Therefore, by reducing the height of the bottoms of the door frames 4 and 4 so as to be approximately the same level as the floor level L in the airlock cylinder 1, a step causing inconvenience can be eliminated. The lower portions of the air lock doors 5 and 5 that swing in the direction interfere with the floor surface in the air lock barrel 1 and the floor surface in the container, making it impossible to open and close them.
[0005]
That is, as shown in FIG. 5, the air lock door 5 seals the opening 3 by pressing the seal member S provided along the peripheral edge thereof to the door frame 4 side. ing. For this reason, it is necessary to form at least the size of the opening 3 in the vertical and horizontal directions. If the height of the bottom of the air lock door 5 is the same as the floor level L, the bottom of the door frame 4 This is because the sealing function cannot be exhibited at all.
[0006]
Note that the opening and closing directions of the air lock doors 5 and 5 need to be in the container side direction as shown in the drawing for the sake of pressure resistance, and it is not appropriate to change the opening and closing directions.
[0007]
Therefore, the present invention has been devised in order to effectively solve such problems, and its purpose is to open and close the door without impairing the sealing function even if the step between the floor surface and the door frame is eliminated. The present invention provides a novel reactor pressure vessel air lock that can be freely implemented.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides an air passage that penetrates the reactor containment vessel substantially horizontally and communicates with the inside and outside of the reactor containment and has a floor level that is the same height as the inside and outside floor surfaces. Opening parts are formed in the partition walls at both ends of the lock cylinder, and the door frame formed along the peripheral edge of each opening part is opened and closed horizontally through a hinge part having a hinge shaft along the vertical direction. In the air lock of a reactor containment vessel equipped with an air lock door, the height of the bottom upper surface of each door frame is made substantially the same as the floor level in the air lock cylinder, and the air lock door A pair of upper and lower support brackets are provided at positions away from the hinge shaft along the vertical direction, and a pair of upper and lower hinge arms extending in the horizontal direction is provided on the hinge shaft, and the support bracket is connected to the tip of the hinge arm. The airlock door mounted for lifting with respect to the hinge portion through supporting rods, provided the door lifting mechanism for raising and lowering the air lock doors on the hinges together, said door lifting mechanism, the air A screw rod that is horizontally supported along the width direction of the lock door, a slider that is engaged with a rail that is screwed to the screw rod and that has a lower end extending in parallel with the screw rod, and the lower end side is the slider. A lift arm having a roller pivotably supported on the side and having a roller rotatable on the upper end side; and a lower part of the upper support bracket so as to be perpendicular to the rail and the roller to the support bracket The support bracket is moved via the slider and lift arm by rolling the roller up and down. It is obtained by a backing plate for lifting the.
[0009]
Thus, first, the height of the bottom of the door frame is set to substantially the same level as the floor level inside and outside the airlock cylinder, so that there are no steps near the floor and it is very easy for workers and carts to enter and exit. In addition, when the height of the bottom of the door frame is lowered in this manner, the position of the air lock door also decreases. By raising and lowering the air lock door, it is possible to easily open and close without interfering with the floor surface. Furthermore, when closing the air lock door, the air lock door and the door frame are reliably brought into contact with each other by lowering the air lock door to a predetermined position, so that a sound sealing function can be maintained.
[0010]
And as this door raising / lowering mechanism, it engages with the screw rod horizontally supported along the width direction of the said air lock door , and the rail which is screwed together by this screw rod and extends in parallel with this screw rod, and is horizontal. A slider that moves in a direction, a lift arm having a lower end pivotally supported on the slider side and a roller that can roll on the upper end side , and perpendicular to the rail below the upper support bracket And a contact plate for raising and lowering the support bracket via the slider and the lift arm by rolling the roller in the vertical direction while the roller is provided in contact with the lower surface of the support bracket. The air lock door can be moved up and down reliably.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, a preferred embodiment for carrying out the present invention will be described with reference to the accompanying drawings.
[0012]
FIG. 1 shows an embodiment of an air lock according to the present invention. In FIG. 1, reference numeral 1 denotes an air lock cylinder having a cylindrical shape for communicating the inside and outside of a reactor containment vessel as described above. Is a partition wall that partitions the end face of the airlock cylinder 1, 4 is a vertically long rectangular door frame formed along the periphery of the opening 3 of the partition wall 2, and 5 is the door frame 4. It is a vertically long rectangular steel airlock door that opens and closes in contact.
[0013]
First, the door frame 4 is formed such that the bottom height of the door frame 4 is substantially the same as the height of the floor surface in the airlock barrel 1 and the floor surface inside and outside the containment vessel. It is a flat state with almost no step between.
[0014]
Next, the air lock door 5 is supported by a hinge portion 6 fixed to the partition wall 2 side, and is rotatable in the horizontal direction around the hinge shaft 7 of the hinge portion 6. That is, a pair of upper and lower support brackets 8, 8 are integrally provided on the air lock door 5 side, and a pair of upper and lower hinge arms 9, extending from the hinge shaft 7 side with respect to each of the support brackets 8, 8. 9 engages with each other so that the air lock door 5 is supported from the side of the partition wall 2, and the entire air lock door 5 is attached to the hinge shaft 7 by the electric motor 10 and the gear mechanism 11 attached to the hinge portion 6. The opening 3 can be freely opened and closed by rotating in the horizontal direction as an axis.
[0015]
The support bracket 8 is formed by vertically connecting a pair of upper and lower bracket members 12, 12 protruding horizontally from the surface of the air lock door 5 with a connecting rod 13. The hinge portion 6 is connected to the connecting rod 13. The tip of the hinge arm 9 is supported through.
[0016]
Further, as shown in the figure, the vertical distance between the bracket members 12 and 12 is set to be considerably wider than the vertical width of the hinge arm 9, and the vertical movement of the air lock door 5 is allowed by the increased width. It is like that.
[0017]
That is, the air lock door 5 according to the present invention is not only rotatably supported by the hinge portion 6 but also the hinge arm 9 from the distance between the bracket members 12 and 12 with respect to the hinge portion 6 and the door frame 4. It is possible to move up and down in the vertical direction by subtracting the vertical width of. An auxiliary arm 14 is further provided at the tip of the hinge arm 9, and the tip of the hinge arm 9 is further engaged with the auxiliary bracket 15 side having the same configuration as that of the support bracket 8, so that the air lock door 5 for the hinge portion 6 is engaged. Can be prevented from swinging and rotating.
[0018]
Further, as shown in the figure, the hinge portion 6 is integrally provided with a so-called jack type door elevating mechanism 16.
[0019]
As shown in FIGS. 1 and 2, the door elevating mechanism 16 includes a screw rod 18 that is horizontally supported by a bearing along the width direction of the airlock door 5, and a slider that moves horizontally along the screw rod 18. 19 and a lift arm 20 whose lower end side is pivotally supported on the slider 19 side and whose upper end side engages with the support bracket 8 side of the air lock door 5 are mainly provided. As shown in FIG. 3, the screw rod 18 is rotationally driven from the motor 22 via the drive chain 21, and the slider 19 screwed to the screw rod 18 is moved horizontally to raise the lift arm 20, thereby By pushing up the bracket member 12, the whole is vertically raised as it is in a state where the air lock door 5 is engaged with the hinge portion 6. That is, the lift arm 20 has a structure in which one end of the lift arm 20 is pivotally coupled to the slider 19 side, and a roller 23 that is freely rotatable is pivotally supported on the other end side. Is moved along the vertical backing plate 26 with the movement (left side in the figure), reaches the lower surface side of the bracket member 12, and acts as if the bracket member 12 is lifted from below to reduce the weight. Even a solid airlock door 5 made of 3 tons of steel can be raised easily and reliably. Further, from this state, the slider 19 is moved in the opposite direction and the lift arm 20 is gradually tilted so that the entire air lock door 5 is slowly lowered by its own weight and returned to the original position. The lower end of the slider 19 is engaged with a rail 24 extending in parallel with the screw rod 18 so that it does not rotate together with the rotation of the screw rod 18.
[0020]
Further, a door lock mechanism 17 is provided at the other end of the screw rod 18 via a drive chain 25. After the air lock door 5 is abutted against the door frame 4 and closed, this is moved to the door frame 4 side. It is designed to be fixed. The structure of the door lock mechanism 17 is the same as that of the prior art, and the description thereof is omitted.
[0021]
In the air lock of the present invention having such a structure, first, unlike the conventional air lock as described above, the bottom height of the door frame 4 is not limited to the inside of the air lock barrel 1 but of the storage container. Since it is formed at almost the same height as the height of the inner and outer floors and there are almost no steps at that position, it is easy for workers to enter and exit, and carts equipped with wheels etc. It is also possible to go in and out, and not only workers but also luggage can be easily carried in and out.
[0022]
Further, since the air lock door 5 itself can be moved up and down with respect to the hinge portion 6, even if the bottom position of the door frame 4 is lowered, the air lock door 5 does not interfere with the floor L at all, and the air lock It is possible to reliably open and close the door 5. In addition, when the air lock door 5 is closed, the air lock door 5 can be reliably brought into contact with the door frame 4, so that the sealing function between the air lock door 5 and the door frame 4 is not impaired. .
[0023]
That is, when the air lock door 5 is opened, the air lock door 5 can be opened without interfering with the floor surface by rotating the air lock door 5 as it is after being vertically raised by the door lifting mechanism 16. On the contrary, when closing the air lock door 5, the air lock door 5 is returned to the door frame 4 side and then lowered vertically by the door lifting / lowering mechanism 16 and then locked, so that the peripheral portion of the air lock door 5 is closed. This seal member can be brought into full contact with the door frame 4 and a complete sealing function can be exhibited.
[0024]
Moreover, since the door raising / lowering mechanism 16 according to the present invention is of the jack type using the screw rod 18, even the heavy airlock door 5 having a weight of 2 to 3 tons is reliably raised and lowered with little power. In addition, since the lift arm 20 itself that lifts and lowers the air lock door 5 serves as a holding rod, it is possible to reliably avoid inconveniences such as the air lock door 5 dropping due to its own weight when opening and closing. Become.
[0025]
【The invention's effect】
In short, according to the present invention, since the air lock door can be freely raised and lowered, the air lock door can be freely opened and closed without interfering with the floor even when the height of the door frame is lowered. . As a result, there is no level difference between the door frame and the floor, making it easy for workers to enter and exit, and enabling the loading and unloading of trolleys that were difficult with conventional structures, reducing labor during inspection work and the like. Excellent effects such as being able to greatly contribute to the improvement of work efficiency can be exhibited.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of an air lock according to the present invention.
FIG. 2 is an explanatory view showing an embodiment of the door lifting mechanism (when the door is lowered).
FIG. 3 is an explanatory view showing an embodiment of the door lifting mechanism (when the door is lifted).
FIG. 4 is a longitudinal sectional view showing a structure of a conventional air lock.
FIG. 5 is an enlarged view showing a portion B in FIG. 4;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Air lock cylinder 2 Partition wall 3 Opening part 4 Door frame 5 Air lock door 6 Hinge part
16 Door lifting mechanism
18 Screw rod
19 Slider
20 Lift arm

Claims (1)

Openings are formed in the partition walls at both ends of the airlock cylinder that penetrate the reactor containment vessel substantially horizontally and communicate with the inside and outside of the reactor containment and have the same floor level as the inside and outside floor surfaces. In the air lock of a reactor containment vessel provided with an air lock door that opens and closes in a horizontal direction via a hinge portion having a hinge axis along the vertical direction on a door frame formed along the peripheral edge of each of the above doors The height of the upper surface of the bottom of the frame is set to be substantially the same as the floor level in the airlock cylinder, and a pair of upper and lower support brackets are vertically spaced from the hinge shaft along the airlock door. A pair of upper and lower hinge arms extending in the horizontal direction is provided on the hinge shaft, and the connecting rod of the support bracket is penetrated and supported at the tip of the hinge arm so that the air lock door faces the hinge portion. Mounted for lifting Te, provided the door lifting mechanism for raising and lowering the air lock doors on the hinges together, said door lifting mechanism comprises a threaded rod axially supported horizontally along the width direction of the air lock door rolling a slider bottom portion screwed to the screw rod is moved in the horizontal direction is engaged with a rail extending parallel to the threaded rod, the lower end side is swingably supported on the slider side to the upper end side A lift arm having a flexible roller, and provided below the upper support bracket so as to be perpendicular to the rail and so as to contact the lower surface of the support bracket. by rolling, reactor, characterized in that the support bracket and a backing plate for elevating through the slider and the lift arm Air lock of paid container.

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