JP2023003708A - Blowout panel device - Google Patents

Abstract

To provide a blowout panel device that can surely close a steam leakage from a building after the steam leakage stops.SOLUTION: A blowout panel device 30 comprises: an air-tight frame 1 that has an opening part and is arranged in a wall face opening part provided in a manner to penetrate inside and outside of buildings of nuclear related facilities; a blowout panel 3 that is capable of opening and closing by a hinge mechanism 4 arranged at an upper part of the air-tight frame 1, and closes the opening part; and an electrically driven pushing mechanism 7 that, when the blowout panel 3 is opened and the blowout panel 3 gets back to an original position upon reduction in inner pressure of the building, pushes the blowout panel 3 against the airtight frame 1. The electrically driven pushing mechanism 7 is configured to rotate an eccentric rotor around a rotation axis to thereby push and close the blowout panel 3.SELECTED DRAWING: Figure 1

Description

The present invention relates to blowout panel arrangements.

In a building of a nuclear power facility, a blowout panel has been proposed that automatically closes (closes) the opening when the opening of the building is released by a predetermined internal pressure and then the pressure inside the building drops to a certain level.

In the blowout panel device according to Patent Document 1, a hanger arm protrudes from the outside surface of the blowout panel, and the tip of the hanger arm is movably engaged with a rail installed downward toward the opening. It is In addition, the rail is fixed to the upper inner surface of the duct that guides the steam that flows out when the main steam pipe bursts. Moreover, a shock absorber is provided on the inner surface of the side wall of the duct so as to face the base end of the hanger arm.

Therefore, in the blow-out panel device according to Patent Document 1, since the tip of the hanger arm of the blow-out panel is movably engaged with the rail, when the internal pressure of the steam flowing out when the main steam pipe bursts acts, the blow-out The out panel moves rapidly along the rail. In addition, by receiving the blowout panel with the shock absorber, the shock acting on the blowout panel is mitigated and its damage is prevented.

JP-A-3-77097

In the blowout panel device according to Patent Document 1, when the outflow of steam from the building stops, the blowout panel returns to the opening by its own weight. However, since the blow-out panel is pressed against the opening by its own weight, there is a possibility that the blow-out panel cannot reliably close the opening.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a blowout panel device that can be reliably closed after the outflow of steam from a building is stopped.

In order to achieve the above object, the blowout panel device of the present invention comprises: an airtight frame having an opening, which is installed in a wall opening provided so as to penetrate the inside and outside of a building of a nuclear power facility, and the airtight frame A blow-out panel that can be opened and closed by a hinge mechanism placed on the top of the building, and a blow-out panel that closes the opening, and when the blow-out panel returns to its original position when the internal pressure of the building drops after the blow-out panel is opened (2) a pushing mechanism for pushing the blowout panel against the airtight pedestal. Other aspects of the present invention are described in embodiments below.

According to the present invention, the building can be reliably closed after the outflow of steam from the building is stopped.

It is a front view which shows the blowout panel apparatus provided in the building of the nuclear reactor related facility which concerns on embodiment. FIG. 2 is a cross-sectional view taken along line AA of FIG. 1 showing the structure of the blowout panel; FIG. 2 is a cross-sectional view along BB in FIG. 1 showing the electric pushing mechanism; It is an enlarged view which shows the holder of a taper eccentric roller and a shear pin. It is a side view which shows the detail around a tapered eccentric roller. It is a top view which shows the structure of the drive part of an electric pushing mechanism. It is a front view which shows the structure of the drive part of an electric pushing mechanism. FIG. 11 is a side view showing a case where the blowout panel is weighted; It is a side view which shows the case where weight arises in a shear pin. It is a side view which shows the case where a shear pin fracture|ruptures. FIG. 10 is an explanatory diagram showing a state in which the blowout panel is opened by the upper hinge mechanism under internal pressure; FIG. 10 is an explanatory diagram showing a reclosed state of the blowout panel due to its own weight; It is explanatory drawing which shows the drive state of the drive part of an electric pushing mechanism. FIG. 11 is a perspective view showing the structure around the electric cylinder viewed from the C section in FIG. 10; It is explanatory drawing which shows the state before rotation of a taper eccentric roller. It is explanatory drawing which shows the state after rotation of a taper eccentric roller. It is a front view showing an example of arranging a plurality of blowout panel devices. 14 is a diagram showing a state in which the electric push-in mechanism is operated in FIG. 13; FIG.

Embodiments for carrying out the present invention will be described in detail with reference to the drawings as appropriate.
FIG. 1 is a front view showing a blowout panel device 30 provided in a building of a nuclear reactor-related facility according to an embodiment. FIG. 2 is a sectional view taken along line AA of FIG. 1 showing the structure of the blowout panel 30. As shown in FIG. FIG. 3 is a cross-sectional view taken along line BB of FIG. 1 showing the electric pushing mechanism 7. As shown in FIG. 4 is an enlarged view showing the tapered eccentric roller 10 and the holder 6 of the shear pin 5. FIG. FIG. 5 is a side view showing details around the tapered eccentric roller 10. FIG.

The blowout panel device 30 is a blowout panel device provided in the wall surface opening 110 of the wall surface of the building 100 of the nuclear power facility. The blowout panel device 30 can be opened and closed by the airtight frame 1 having the opening 9 installed in the wall opening 110 and the hinge mechanism 4 arranged on the upper part of the airtight frame 1. It comprises an out panel 3, a shear pin 5 for closing the blowout panel 3, and an electric pushing mechanism 7 for closing the blowout panel 3 again after the blowout panel 3 is opened. The blowout panel 3 is opened by breaking the shear pin 5 when the internal pressure of the building 100 increases, and when the blowout panel 3 returns to its original position when the internal pressure of the building 100 decreases, the blowout panel 3 is closed by the electric pushing mechanism 7. do.

As shown in FIG. 1 , hinge mechanisms 4 are provided at two locations on the upper portion of the base plate 2 , and holders 6 for fixing shear pins 5 are provided at two locations on the lower portion of the base plate 2 . Electric pushing mechanisms 7 are provided at two locations on the lower portion of the base plate 2 . The base plate 2 is arranged on the airtight pedestal 1 .

FIG. 2 shows the position of the blowout panel 3 in normal times and the position of the blowout panel 3 when the internal pressure of the building 100 rises. In a normal state, the blowout panel 3 is kept airtight by a shear pin 5 provided at the bottom of the blowout panel 3 being fixed by a holder 6 and pressing a sealing material 8 . When the internal pressure of the building 100 rises, the shear pin 5 breaks and the blowout panel 3 is opened as indicated by the two-dot chain line. In the present embodiment, the holding mechanism with the shear pin 5 is shown, but it is not limited to this. The holding mechanism may be a mechanism that is elastically deformed and released by a certain pressure as well as destruction of the material.

FIG. 3 shows the position of the tapered eccentric roller 10 of the electric pushing mechanism 7 at the time of reclosing. The tapered eccentric roller 10 is eccentric with respect to the center of rotation 11 . At the time of re-closing, the tapered eccentric roller 10 engages with the roller engaging portion 3a provided at the tip of the blowout panel 3 to close the blowout panel 3. As shown in FIG. The tapered eccentric roller 10 may have, for example, an abacus ball shape, a tapered square shape, a triangular shape, or the like. The side surface of the tapered eccentric roller 10 (eccentric rotating body) has a taper or a convex portion.

FIG. 4 shows the normal position of the tapered eccentric roller 10 and the positional relationship at the time of re-closing. The tapered eccentric roller 10 is normally not engaged with the roller engaging portion 3a (see FIG. 3), but is engaged with the roller engaging portion 3a when the door is closed again.

FIG. 5 shows details around the tapered eccentric roller 10 . The tapered eccentric roller 10 is arranged on a roller rotation shaft 12 , and a roller rotation gear 13 is provided at the other end of the roller rotation shaft 12 . The roller rotating gear 13 can be rotated by a drive unit 20 (see FIGS. 5 and 6), which will be described later. An airtight reinforcing portion 3b is joined to the roller engaging portion 3a, and the airtight reinforcing portion 3b presses the sealing material 8 to improve the airtightness.

6 is a top view showing the structure of the driving portion 20 of the electric pushing mechanism 7. FIG. FIG. 7 is a front view showing the structure of the driving portion 20 of the electric pushing mechanism 7. FIG.
The drive unit 20 includes an electric cylinder 18 , a drive shaft rotating gear 17 , a drive shaft 16 , a rack moving gear 15 and a rack 14 . The piston rod of the electric cylinder 18 is tooth-cut linearly, and by engaging with the circular gear of the drive shaft rotation gear 17, the linear motion of the piston rod (electric cylinder 18) is transferred to the drive shaft rotation gear 17 (driving gear 17). Axis 16 converts to rotary motion of rack moving gear 15). A drive shaft rotating gear 17 is provided at one end of the drive shaft 16 and a rack moving gear 15 is provided at the other end. Both ends of the rack 14 are tooth-cut in a straight line. Therefore, when the piston rod of the electric cylinder 18 is pulled to the right side of the drawing (see the arrow), the rack moving gear 15 rotates counterclockwise, and the left and right racks 14 can move. As shown in FIG. 7, there are two racks 14 in this example, and the racks 14 on the right side and the racks 14 on the left side move in opposite directions as indicated by the arrows indicating the direction of movement of the racks 14 . This detailed structure is shown in FIG. FIG. 11 shows a rack-and-pinion system in which the linear motion of the electric cylinder 18 is converted into rotary motion. A similar mechanism can be achieved with a mechanism that converts to motion.

Next, the operation of reclosing the blowout panel 3 will be described with reference to FIGS. 8A to 12. FIG.
FIG. 8A is a side view showing a case where the blowout panel 3 is loaded. FIG. 8B is a side view showing a case where the shear pin 5 is loaded. FIG. 8C is a side view showing a case where the shear pin 5 is broken. FIG. 9A is an explanatory diagram showing a state in which the blowout panel 3 is opened by the upper hinge mechanism 4 under internal pressure. FIG. 9B is an explanatory diagram showing the reclosed state of the blowout panel 3 due to its own weight. 10A and 10B are explanatory diagrams showing the driving state of the driving portion 20 of the electric pushing mechanism 7. FIG. FIG. 11 is a perspective view showing the structure around the electric cylinder 18 viewed from the C section in FIG. FIG. 12A is an explanatory diagram showing a state before rotation of the tapered eccentric roller 10. FIG. FIG. 12B is an explanatory diagram showing a state after the tapered eccentric roller 10 is rotated. The upper diagram in FIG. 10 is the same diagram as in FIG. 6, and the lower diagram in FIG. 10 is an excerpt from FIG.

(1) Water vapor increases the internal pressure in the building 100, causing a load on the face plate of the blowout panel 3 (see FIG. 8A).
(2) The load is transmitted to the shear pin 5 that locks the blowout panel 3 and breaks (see FIGS. 8B and 8C).
(3) Under internal pressure, the blowout panel 3 is opened by the upper hinge mechanism 4 (see FIG. 9A).
(4) The pressure inside and outside the building 100 becomes uniform, and the blowout panel 3 descends due to its own weight (see FIG. 9B).
(5) The up-and-down (push-pull) motion of the electric cylinder is converted into rotary motion by the drive shaft rotary gear 17 (see FIGS. 10 and 11).
(6) The rotational motion of the rack moving gear 15 is transmitted to the roller rotating gears 13 (roller rotating gears 13L, 13R) via the racks 14 (racks 14L, 14R) (see FIGS. 10 and 11).
(7) The left and right roller rotating gears 13 and the coaxial tapered eccentric rollers 10 rotate eccentrically (see FIG. 12A).
(8) The tapered eccentric roller 10 is inserted into the roller locking portion 3a of the blowout panel 3, and the blowout panel 3 presses against it, so that the blowout panel 3 can be closed again (see FIG. 12B). ).

The timing of the operation of the electric cylinder 18 may be automatically operated by a command of a detection switch that detects that the blowout panel 3 has returned, or the administrator can confirm that the pressure inside and outside the building 100 has become uniform. may be operated when determined by

Further, in the case of this embodiment, the electric cylinder 18 is used for the drive unit 20, but in consideration of the power loss in the building 100, a manually operated cylinder may be used.

FIG. 13 is a front view showing an example in which a plurality of blowout panel devices 30 are arranged. FIG. 13 shows a case where eight blowout panel devices 30 shown in FIG. 1 are arranged when the wall opening 110 (see FIG. 2) of the building 100 is large.

14 is a diagram showing a state in which the electric pushing mechanism 7 is operated in FIG. 13. FIG. It can be seen that the tapered eccentric roller 10 has rotated to a position where the blowout panel 3 can be reclosed. By driving the electric pushing mechanism 7 (see FIG. 1) at the time of periodic inspection, it is possible to confirm whether the tapered eccentric roller 10 is in a normal state or in a reclosed state.

<Effect>
In the blowout panel device according to Patent Document 1, when the outflow of steam from the building stops, the blowout panel returns to the opening by its own weight. However, the pressing force from the blow-out panel to the opening is weakened, and there is a problem that the blow-out panel cannot reliably close the opening. According to this embodiment, the electric push-in mechanism 7 rotates the tapered eccentric roller 10 , so that the opened opening 9 can be reliably closed by the blowout panel 3 . Further, since the blowout panel device 30 has the electric push-in mechanism 7, it is possible to reclose the blowout panel 3 by a remote instruction.

REFERENCE SIGNS LIST 1 airtight mount 2 base plate 3 blowout panel 3a roller locking portion 3b airtight reinforcing portion 4 hinge mechanism 5 shear pin 6 holder 7 electric pushing mechanism (pushing mechanism)
8 sealing material 9 opening 10 tapered eccentric roller (eccentric rotating body, abacus ball)
11 rotation center 12 roller rotation axis (rotation axis)
13, 13L, 13R Roller rotating gear 14, 14L, 14R Rack 15 Rack moving gear 16 Drive shaft 17 Drive shaft rotating gear 18 Electric cylinder 20 Drive unit 30 Blowout panel device 100 Building 110 Wall opening

Claims (6)

An airtight mount having an opening, which is installed in a wall opening provided to penetrate the inside and outside of the building of the nuclear power facility;
A blowout panel that can be opened and closed by a hinge mechanism arranged on the upper part of the airtight pedestal and closes the opening;
a pushing mechanism that pushes the blow-out panel against the airtight frame when the blow-out panel returns to its original position when the internal pressure of the building drops after the blow-out panel is opened. Blowout panel device. 2. The blowout panel device according to claim 1, wherein the pushing mechanism presses and closes the blowout panel by rotating an eccentric rotating body around a rotating shaft. The blowout panel device according to claim 2, wherein the side surface of the eccentric rotor has a taper or a convex portion. The blowout panel device according to claim 2, wherein the eccentric rotating body is shaped like an abacus ball. The blowout panel device according to claim 2, wherein the pushing mechanism has a drive section for rotating the rotating shaft, and the drive section is disposed within the airtight mount. The blowout panel device according to claim 5, wherein the drive section rotates the rotating shaft by electric power.

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