JP2002139592A - Air lock for nuclear reactor containment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new air lock for reactor containment capable of opening and closing a door without impairing seal function even if eliminating the difference in level between a floor surface and a door frame. SOLUTION: The bottom height of the door frame 4 in the opening part 3 of an air lock drum 1 extending through a reactor containment A is set substantially equal to the floor level within the air lock drum 1. An air lock door 5 is liftably mounted on the door frame 4, and a door lifting mechanism 16 for lifting the air lock door 5 is provided on the hinge part 6 thereof. Accordingly, the door can be freely opened and closed without impairing the seal function even if the difference in level between the floor surface and the door frame is eliminated, and the getting-in and -out of a worker, a truck or the like can be facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air lock for a worker or the like to enter or leave a containment vessel.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional airlock generally includes a cylindrical airlock cylinder 1 which penetrates a concrete wall A of a reactor containment vessel or the like substantially horizontally and communicates the inside and outside thereof. Each of the partition walls 2 and 2 has a rectangular opening 3 at a substantially central portion of each of the partition walls 2 and 2 and the door frames 4 and 4 of each of the openings 3 and 3 have a container inside. It has a vertically long rectangular airlock door 5 that opens and closes in the direction. Usually, the inside of the container is double-sealed by the pair of inner and outer airlock doors 5 and 5, and when an operator enters or exits the container, one of the airlock doors 5 is opened or closed by an opening / closing mechanism (not shown). By alternately opening only the container, the inside of the container is not opened even when a worker enters or leaves, and the structure is such that a high sealing property can always be ensured.

[0003]

In the conventional airlock having such a structure, the height of the bottom portions of the door frames 4 and 4 is considerably higher than the floor level L in the airlock body 1. As a result, a large step is generated at the position, which is a hindrance when workers enter and exit, and is a factor that makes it extremely difficult to carry in and out a cart and the like.

[0004] Therefore, by lowering the heights of the bottoms of the door frames 4 and 4 to be substantially the same as the floor level L in the airlock cylinder 1, it is possible to eliminate a step which causes such inconvenience. Then, the airlock door 5, which swings horizontally,
The lower part of 5 interferes with the floor surface in the airlock cylinder 1 or the floor surface in the container, and the opening and closing of the lower part becomes impossible.

That is, as shown in FIG. 5, the air lock door 5 has a sealing member S provided along the periphery thereof.
Is pressed against the door frame 4 side so that the opening 3
Is to be sealed. Therefore, it is necessary that the airlock door 5 be formed to have a size that is wider than at least the opening 3 in the vertical and horizontal directions. If the height of the bottom of the airlock 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.

The opening and closing directions of the airlock doors 5 and 5 must be in the container side as shown in the figure for the sake of pressure resistance, and it is not appropriate to change the opening and closing directions.

The present invention has been devised in order to effectively solve such a problem, and an object of the present invention is to provide a door without losing a sealing function even if a step between a floor surface and a door frame is eliminated. It is intended to provide a new airlock for a reactor pressure vessel that can freely open and close the reactor.

[0008]

In order to solve the above-mentioned problems, the present invention provides an air-lock cylinder which penetrates a reactor containment vessel substantially horizontally and communicates between the inside and the outside thereof. In an airlock for a reactor containment vessel having an airlock door that forms an opening and opens and closes horizontally in a door frame of each of the openings via a hinge, the height of the bottom of the door frame is adjusted by the air. With the height substantially equal to the floor level in the lock body, the airlock door is attached to the hinge part so as to be able to move up and down, and the hinge part has a door lifting mechanism for raising and lowering the airlock door. It is.

As described above, the height of the bottom of the door frame is set to be substantially the same as the floor level inside and outside the airlock body, so that there is no step near the door and it is extremely easy for workers and bogies to enter and exit. Become. Also, when the height of the door frame bottom is lowered in this way, the position of the airlock door also lowers, but in the present invention, since this airlock door is attached to the hinge part by the door lifting mechanism so that it can be raised and lowered, when opening and closing, By raising and lowering the airlock door, the door can be easily opened and closed without interfering with the floor surface. Further, when closing the airlock door, the airlock door is lowered to a predetermined position so that the airlock door and the door frame are securely brought into contact with each other, so that a sound sealing function can be maintained.

The door elevating mechanism may include a screw rod positioned horizontally along the airlock door, a slider moving horizontally along the screw rod, and a lower end. The use of a slider that is pivotally supported on the slider side and has a lift arm whose upper end is engaged with the airlock door side allows the airlock door to be reliably moved up and down.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an embodiment of an air lock according to the present invention. In FIG. 1, reference numeral 1 denotes a cylindrical air lock for communicating between the inside and outside of a reactor containment vessel as described above. The body 2 is a partition wall for partitioning the end face of the airlock body 1, 4 is a vertically long rectangular door frame formed along the periphery of the opening 3 of the partition wall 2, 5 is the door frame 4 is a vertically long rectangular steel airlock door that contacts and opens and closes the door.

First, the bottom of the door frame 4 is formed at substantially the same height as the floor inside the airlock cylinder 1 and the floor inside and outside the containment vessel. There is almost no step between the floor and the floor.

Next, the airlock door 5 is supported by a hinge 6 fixed to the partition wall 2 side, and is freely rotatable in a horizontal direction about a hinge shaft 7 of the hinge 6. . That is, a pair of upper and lower support brackets 8 are integrally provided on the airlock door 5 side,
The air lock door 5 is supported from the partition wall 2 side by engaging a pair of upper and lower hinge arms 9, 9 extending from the hinge shaft 7 side with the respective support brackets 8, 8. Electric motor 10 attached to
And the gear mechanism 11 causes the entire air lock door 5 to rotate in the horizontal direction about the hinge shaft 7 so that the opening 3
Has a structure that can be freely opened and closed.

The support bracket 8 is provided with the air lock door 5.
A pair of upper and lower bracket members 1 protruding horizontally from the surface of the
The connecting rod 13 is connected vertically by a connecting rod 13, and the distal end of the hinge arm 9 of the hinge 6 is penetrated and supported by the connecting rod 13.

As shown in the figure, the vertical distance between the bracket members 12, 12 is set to be considerably larger than the vertical width of the hinge arm 9, and the vertical movement of the air lock door 5 is increased by the widened distance. Is allowed.

That is, the airlock door 5 according to the present invention.
Is not only rotatably supported by the hinge 6, but also moves in the vertical direction by an amount obtained by subtracting the vertical width of the hinge arm 9 from the interval between the bracket members 12, 12 with respect to the hinge 6 and the door frame 4. Can be freely moved (elevated). still,
An auxiliary arm 14 is further provided at the distal end of the hinge arm 9, and the distal end further engages with the auxiliary bracket 15 having the same configuration as the support bracket 8 to swing the airlock door 5 relative to the hinge 6. Movement and rotation are suppressed.

As shown in the figure, a so-called jack-type door lifting / lowering mechanism 16 is provided integrally with the hinge 6.

As shown in FIGS. 1 and 2, the door lifting mechanism 16 includes a screw rod 18 horizontally supported by a bearing along the width direction of the airlock door 5, and the screw rod 1.
And a lift arm 20 whose lower end is pivotally supported by the slider 19 and whose upper end engages with the support bracket 8 of the airlock door 5. For the Lord,
As shown in FIGS. 2 and 3, the screw rod 18 is driven to rotate by a motor 22 via a drive chain 21, a slider 19 screwed to the screw rod 18 is horizontally moved to elevate the lift arm 20, and the support bracket By pushing up the bracket member 12 of FIG. 8, the airlock door 5 is vertically raised as it is in a state where the airlock door 5 is engaged with the hinge portion 6. That is, the lift arm 20
Has a structure in which one end thereof is swingably pin-connected to the slider 19 side and a rotatable roller 23 is pivotally supported on the other end side, and this roller 23 moves the slider 19 (left side in the figure). ), Along the vertical backing plate 24, reaches the lower surface side of the bracket member 12, and acts so as to lift the bracket member 12 from below, so that the steel robustness weighs 2 to 3 tons. Even a simple airlock door 5 can be easily and reliably raised. Further, from this state, the slider 19 is moved in the opposite direction to gradually lower the lift arm 20, whereby the entire airlock door 5 is slowly lowered by its own weight and returned to the original position.
The lower end of the slider 19 has the screw rod 1.
The screw rod 18 is engaged with a rail 24 extending in parallel with the screw rod 18 so as not to rotate together with the screw rod 18.

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 abuts on the door frame 4 and is closed,
This is fixed to the door frame 4 side. The structure of the door lock mechanism 17 is the same as that of the related art, and a description thereof will be omitted.

In the airlock of the present invention having such a structure, first, unlike the above-described conventional airlock, the height of the bottom of the door frame 4 is changed to the airlock cylinder 1.
It is formed at the same height as the inside and outside of the containment vessel, as well as inside and outside of the containment vessel. It is also possible to move in and out of a trolley or the like provided with the above, so that not only workers but also luggage and the like can be easily carried in and out.

Further, since the airlock door 5 itself can be moved up and down with respect to the hinge 6, even if the bottom position of the door frame 4 is lowered, the airlock door 5 does not interfere with the floor L at all. Thus, the opening and closing of the air lock door 5 can be reliably performed. In addition, when the airlock door 5 is closed, the airlock door 5 can be reliably brought into contact with the door frame 4 so that the sealing function between the airlock door 5 and the door frame 4 is not impaired. .

That is, when the airlock door 5 is opened, the airlock door 5 is raised vertically by the door lifting / lowering mechanism 16 and then rotated so that the airlock door 5 does not interfere with the floor surface. When the airlock door 5 is closed, the airlock door 5 can be opened.
After returning to the door frame 4 side, the seal member at the periphery of the airlock door 5 can be completely brought into contact with the door frame 4 by lowering the door frame vertically by the door elevating mechanism 16 and then locking the door member. It is possible to exhibit a complete sealing function.

Further, since the door lifting mechanism 16 according to the present invention is of the jack type using the screw rod 18, the heavy weight of the air lock door 5 such as 2-3 tons is used.
Even when the air lock door 5 can be reliably moved up and down with a small amount of power, and the lift arm 20 itself that moves up and down the air lock door 5 serves as a stick bar, the air lock door 5 drops by its own weight when opening and closing. Such inconveniences can be reliably avoided.

[0025]

In summary, according to the present invention, since the airlock door can be freely raised and lowered, the airlock door can be freely opened and closed without interfering with the floor surface even when the height of the door frame is lowered. Can be done. As a result, there is no step between the door frame and the floor surface, which makes it easy for workers to enter and exit, and also makes it possible to carry in and out trolleys and the like, which was difficult with the conventional structure, thereby reducing labor for inspection work and the like. Excellent effects such as being able to greatly contribute to improvement of work efficiency can be exhibited.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of an airlock 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 diagram showing an embodiment of the door lifting mechanism (when the door is raised).

FIG. 4 is a longitudinal sectional view showing the structure of a conventional airlock.

FIG. 5 is an enlarged view showing a portion B in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air lock body 2 Partition wall 3 Opening 4 Door frame 5 Air lock door 6 Hinge part 16 Door lifting mechanism 18 Screw rod 19 Slider 20 Lift arm

Claims (2)

[Claims] 1. Openings are formed at both ends of an airlock cylinder penetrating a containment vessel substantially horizontally and communicating the inside and outside thereof, and the door frames of the openings are opened and closed in a horizontal direction via hinge portions. In the airlock of a reactor containment vessel provided with an airlock door, the height of the bottom of the door frame is made substantially the same as the floor level in the airlock body, and the airlock door is connected to the hinge portion. An airlock for a reactor containment vessel, characterized in that the airlock is mounted on the hinge portion of the reactor containment so as to be movable up and down, and a door lifting mechanism for lifting and lowering an airlock door is provided at a hinge portion thereof. 2. The door raising / lowering mechanism includes a screw rod horizontally supported along the airlock door, a slider moving horizontally along the ball rod, and a lower end swinging toward the slider. The airlock of a containment vessel according to claim 1, further comprising a lift arm that is freely supported and has an upper end side engaged with the airlock door side.