Blowout panel device

Abstract

The present invention provides a blowout panel device that has the contradictory functions of rapid opening and slow stopping of the blowout panel. [Solution] The blowout panel device 100 comprises a blowout panel 1 that closes an opening 30 in the building of a nuclear-related facility, a hinge portion 2 that fixes the blowout panel to the building structure at the top or bottom, and a buffer mechanism 110 with one end connected to the structure and having a spring and damper arranged in parallel. The other end of the blowout panel 1 and the buffer mechanism 110 are attached via a flexible member (for example, a wire 7). When the door of the blowout panel 1 is opened, the door opens almost without load up to a predetermined door opening, and when it exceeds the predetermined door opening, the buffer mechanism 110 operates and the blowout panel stops at a predetermined limited door opening below the limit door opening where damage occurs, and then the blowout panel 1 returns in the direction of closing to the predetermined door opening.

Description

Technical Field

[0001] The present invention relates to a blowout panel device having an opening / closing function for a reactor building.

Background Art

[0002] In a reactor building, a blowout panel (BOP) is installed to release the pressure inside the building when it rises. After the blowout panel is opened, there is a requirement to reclosing it, and there is a blowout panel device having an opening / closing function.

[0003] The blowout panel device quickly releases the increased pressure inside the building, and the door, which is the blowout panel, needs to be rapidly opened to a predetermined opening degree almost under no load. On the other hand, since the blowout panel device is used by repeatedly opening and closing, it is necessary to slowly stop at a predetermined opening degree before reaching the limit opening degree where a failure occurs.

[0004] A fixing method or the like that ensures seismic resistance considering the arrangement in a narrow part of the building together with this contradictory function is required.

[0005] For example, there is Patent Document 1 as an example of a blowout panel device. The blowout panel device of Patent Document No. 1 includes a blowout panel that closes an opening formed in a building of a nuclear power generation facility in an openable and closable manner by rotating one end edge portion horizontally, and a weight portion that gives a moment in the direction in which the blowout panel closes. When the internal pressure of the building rises above a predetermined value, the blowout panel opens against the moment and the opening is released. When the internal pressure of the building drops, the blowout panel closes by the moment and the opening is blocked, which is disclosed.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

[0007] However, while the blowout panel device disclosed in Patent Document 1 discloses a buffering function using a weight, it does not disclose a means to achieve the conflicting functions of rapid opening and slow stopping required for a blowout panel device.

[0008] The present invention was made to solve the aforementioned problems and aims to provide a blowout panel device that has the contradictory functions of rapid opening and slow stopping of the blowout panel. [Means for solving the problem]

[0009] To achieve the above objective, the blowout panel device of the present invention comprises a blowout panel that closes an opening in the building of a nuclear-related facility, a hinge portion that fixes the blowout panel to the building structure at the top or bottom, and a buffer mechanism having one end connected to the building structure and having a spring and a damper arranged in parallel, wherein the other end of the blowout panel and the buffer mechanism are attached via a flexible member, and when the door of the blowout panel is opened, the door opens almost without load up to a predetermined door opening, and when it exceeds the predetermined door opening, the buffer mechanism operates so that the blowout panel stops at a predetermined limited door opening below the limit door opening where damage occurs, and thereafter the blowout panel returns in the direction of closing to the predetermined door opening. Other aspects of the present invention will be described in the embodiments described later. [Effects of the Invention]

[0010] According to the present invention, it is possible to achieve the contradictory functions of rapid opening and slow stopping of the blowout panel. [Brief explanation of the drawing]

[0011] [Figure 1]This figure shows the state of the blowout panel when it is closed in a blowout panel device equipped with a buffer mechanism according to the first embodiment. [Figure 2] This figure shows the state of the blowout panel when it is open in a blowout panel device equipped with a buffer mechanism according to the first embodiment. [Figure 3] This is a diagram showing the structure of the buffer mechanism according to the first embodiment. [Figure 4] This figure shows a front view of a blowout panel device equipped with a buffer mechanism according to the first embodiment. [Figure 5] This figure shows the state of the blowout panel of the seismic support section of the buffer mechanism according to the first embodiment when it is closed. [Figure 6] This figure shows the state of the blowout panel of the seismic support section of the buffer mechanism according to the first embodiment when it is open. [Figure 7A] This diagram shows the structure of the first support of the seismic support unit according to the first embodiment. [Figure 7B] This diagram shows the structure of the second support of the seismic support unit according to the first embodiment. [Figure 8A] This figure shows an example of the operation of a blowout panel device equipped with a buffer mechanism according to the first embodiment, and represents the dimensionless opening degree of the door. [Figure 8B] This figure shows an example of the operation of a blowout panel device equipped with a buffer mechanism according to the first embodiment, and illustrates the dimensionless load of the buffer mechanism. [Figure 9] This figure shows the state of a blowout panel device equipped with a three-bar linkage mechanism according to the second embodiment when the blowout panel is closed. [Figure 10] This figure shows the blowout panel in the open state of a blowout panel device equipped with a three-bar linkage mechanism according to the second embodiment. [Figure 11] This figure shows the structure of the second buffer mechanism according to the third embodiment. [Figure 12] Figure 1 shows the blowout panel in the closed position of a blowout panel device equipped with a buffer mechanism, with the hinge portion located at the top. [Figure 13]It is a diagram showing the state when the blow-out panel of a blow-out panel device equipped with a buffer mechanism, where the hinge part is arranged at the upper part in Fig. 2, is opened.

Embodiments for Carrying out the Invention

[0012] Embodiments for carrying out the present invention will be described in detail while appropriately referring to the drawings. <First Embodiment> Fig. 1 is a diagram (side sectional view) showing the state when the blow-out panel of the blow-out panel device 100 equipped with the buffer mechanism 110 according to the first embodiment is closed. Fig. 2 is a diagram (side sectional view) showing the state when the blow-out panel of the blow-out panel device 100 equipped with the buffer mechanism 110 according to the first embodiment is opened. Fig. 3 is a diagram showing the structure of the buffer mechanism 110 according to the first embodiment.

[0013] The blow-out panel device 100 shown in Figs. 1 and 2 includes a blow-out panel 1 that closes an opening 30 of a building in an atomic energy-related facility, a hinge part 2 that fixes the blow-out panel 1 (door) to the building body at the lower part, and a buffer mechanism 110 in which one end is connected to the body and a spring 4 and a damper 3 shown in Fig. 3 are arranged in parallel. The other end of the blow-out panel 1 and the buffer mechanism 110 are attached via a flexible member (for example, a wire 7). In the first embodiment, a configuration having a hinge part 2 at the lower part will be described, but a configuration having a hinge part 2 at the upper part may also be used. Details will be described later with reference to Figs. 12 and Fig. 13. Also, the flexible member may be any of a belt, a chain, and a flexible shaft.

[0014] As shown in Fig. 1, the wire 7, which is a flexible member, is preferably connected in a state where it has a pre-looseness, and the length is adjusted so that the looseness disappears at the door opening degree for operating the buffer mechanism 110 (see Fig. 2).

[0015] In the lower-hinged blowout panel device 100, which consists of a blowout panel 1 and a hinge 2, when the door opening angle θ=0 (i.e., the closed state (see Figure 1)), a damper 3 and a spring 4, as shown in Figure 3, are arranged in parallel. A buffer mechanism 110, which is assembled with these and an outer cylinder 5 using a flange 6, is suspended at a predetermined fixed position, and the blowout panel 1 and the buffer mechanism 110 are connected by a slack wire 7. The length of the slack wire 7 determines the length of the blowout panel 1. When the wire 7 is tightened at a predetermined door opening angle θ=θ0, the buffer mechanism 110 operates, the rotation speed of the blowout panel 1 is reduced, it stops at a predetermined door opening angle θ=θ1, and then the blowout panel 1 can be slowly returned to θ0. Details will be described later in Figures 8A and 8B, but up to a predetermined door opening angle, the door opens without speed limitation by the buffer mechanism 110 (i.e., almost no load). On the other hand, beyond the predetermined door opening angle, the door opens with speed limitation by the buffer mechanism 110 (and its damping force).

[0016] Here, with respect to the damper 3 and spring 4 that constitute the buffer mechanism 110, by appropriately setting the damping force of the damper 3 and the spring constant of the spring 4, θ1 is set to the limit door opening θ which is the door opening angle at which damage occurs. F It can be adjusted to be smaller than this. Also, if 30≦θ0≦60°, 50≦θ1≦90°, and θ1-θ0≧15° are set, then the initial opening θ0 and θ1<θ required for the blowout panel device 100 can be adjusted. F The damping force of the damper 3 and the spring constant of the spring 4 can be set to satisfy the conditions. Specifically, the starting door opening angle of the buffer mechanism 110 should be set to 30 degrees or more and 60 degrees or less, and the limiting door opening angle should be set to 50 degrees or more and 90 degrees or less, with a difference of 15 degrees or more between the two. Although a lower-hinged blowout panel device 100 is used as an example here, it can also be applied to an upper-hinged blowout panel device 100.

[0017] Figure 4 is a front view from the outside of a blowout panel device 100 equipped with a buffer mechanism 110 according to the first embodiment. The blowout panel device 100 shown in Figure 4 is installed to open and close an opening 30 formed in the outer wall of the reactor building, and the hinge portion 2 is installed at the bottom of the blowout panel 1. This blowout panel 1 is made of, for example, an aluminum alloy and is formed in the shape of a rectangular plate. Note that the blowout panel 1 is not limited to an aluminum alloy and may be made of iron.

[0018] A drive unit 10 for rotating the blowout panel 1 is installed in the hinge section 2. The drive unit 10 consists of an electric motor 10a and a gear 10b, and the gear 10b and the hinge section 2 are connected via a drive shaft. Furthermore, the blowout panel device 100 is equipped with a structure that physically disengages the drive shaft by a clutch 11 in the event that the blowout panel 1 opens during an accident, as an impact would act on the drive shaft.

[0019] The blowout panel device 100 includes an arm 12 that connects the blowout panel 1 and the hinge portion 2. This arm 12 is provided at two locations spaced apart in the left-right direction. One end of the arm 12 is fixed to the blowout panel 1, and the other end is fixed to the hinge portion 2. When closing the blowout panel 1, the clutch 11 is engaged, and the blowout panel 1 is closed by the drive unit 10.

[0020] Although not shown in the diagram, the blowout panel 1 is fixed in place by magnets when closed. A magnetic material is installed on the blowout panel 1 side, and the mounting plate on which the magnets are arranged is fixed along the periphery of the opening 30 of the building. The magnets are, for example, electromagnets or permanent magnets. The magnetic material is embedded in the back of the blowout panel 1 at a position opposite the magnets. Note that if the blowout panel 1 is made of aluminum or an aluminum alloy, it is a non-magnetic material and will not be attracted to magnets, so a magnetic material is attached to the blowout panel 1.

[0021] Figure 5 shows the state of the blowout panel of the seismic support section of the buffer mechanism 110 according to the first embodiment when it is closed. Figure 6 shows the state of the blowout panel of the seismic support section of the buffer mechanism 110 according to the first embodiment when it is open. Figure 7A shows the structure of the first support 8 of the seismic support section according to the first embodiment. Figure 7B shows the structure of the second support 9 of the seismic support section according to the first embodiment. The seismic support section is composed of the first support 8 and the second support 9.

[0022] As previously described, when the door opening angle θ=0 of the blowout panel device 100 (see Figure 5), the buffer mechanism 110 is suspended at a predetermined fixed position and connected to the blowout panel 1 and the buffer mechanism 110 by a loose wire 7. However, when an earthquake occurs, the buffer mechanism 110 may swing and collide with the blowout panel 1 (door), etc. Therefore, although it is necessary to fix the buffer mechanism 110 in preparation for an earthquake, it must not obstruct the opening of the blowout panel 1. To this end, a first support 8 is provided on the blowout panel 1, and a second support 9 is provided on the fixed part on the opposite side via the buffer mechanism 110, so that the buffer mechanism 110 is fixed between the two. At this time, an outer cylinder 5 is provided on the buffer mechanism 110, as shown in Figure 3, so that the second support 9 does not come into contact with the spring 4, which is a movable member.

[0023] When the blowout panel 1 is opened, the first support 8 of the blowout panel 1 detaches (moves to the outdoor side in Figure 5), releasing the fixing of the buffer mechanism 110 and not hindering the opening of the blowout panel 1.

[0024] In the structure of the first support 8 shown in Figure 7A, the first support 8 consists of a wire guide 81 that straddles the wire 7 and has its tip connected, a fixing part 82 to the blowout panel 1, a buffer mechanism receiver 83, and a support plate 84. The wire guide 81 is high enough so that the wire 7 does not come into contact with it while the blowout panel 1 is opening, and the connection of its tip makes it possible to suppress the movement of the wire 7.

[0025] In the structure of the second support 9 shown in Figure 7B, the second support 9 consists of a fixing part 92 for the frame, a buffer mechanism receiver 93, and a support plate 94. When the blowout panel 1 is closed, the outer cylinder 5 is fixed by the buffer mechanism receivers 83 and 93 of the outer cylinder 5 of the buffer mechanism 110.

[0026] As shown in Figures 5, 6, 7A, and 7B, the buffer mechanism 110 is normally fixed by being sandwiched between a first support 8 installed on the door and a second support 9 installed on the side of the building structure (see Figure 5). When the blowout panel 1 is opened, the first support 8 moves together with the blowout panel 1, releasing the buffer mechanism (see Figure 6).

[0027] The first support 8 has a split structure that does not hinder the movement of the flexible member when the cushioning mechanism 110 is released (see Figure 7A).

[0028] The flexible wire 7 is installed between the split structures, and a portion of the split structure is connected at a position that does not interfere with the movement of the wire 7, thereby preventing the wire 7 from coming off the split structure. In Figure 6, it can be seen that the wire 7 is housed in the wire guide 81.

[0029] Figure 8A shows an example of the operation of a blowout panel device equipped with a buffer mechanism according to the first embodiment, and is a diagram showing the dimensionless opening of the door. Figure 8B shows an example of the operation of a blowout panel device equipped with a buffer mechanism according to the first embodiment, and is a diagram showing the dimensionless load of the buffer mechanism. In Figure 8A, θ F This is the maximum door opening angle.

[0030] In the dimensionless door opening shown in Figure 8A, it can be seen that the door opens rapidly from θ=0 to θ0, then stops at a predetermined limited door opening θ1 due to the operation of the buffer mechanism 110, and then the blowout panel 1 (door) slowly returns to θ0. Furthermore, the condition θ1 < θ prevents damage to the blowout panel device 100. F It can be seen that the conditions are satisfied.

[0031] As can be seen from the time history change of the load on the buffer mechanism 110 under dimensionless load shown in Figure 8B, these can be achieved by appropriately setting the damping force of the damper 3 and the spring constant of the spring 4. In other words, by making the maximum values ​​of the damping force of the damper 3 and the load of the spring 4 roughly the same, the load of the buffer mechanism 110, which is the sum of the two, can be effectively applied.

[0032] In other words, the cushioning mechanism 110 has spring and damping characteristics such that the ratio of the spring force generated when absorbing the impact during the opening operation of the blowout panel to the damping force by the damper is approximately equal, and the load acting on each component is evenly distributed.

[0033] <Second Embodiment> A modified example of the wire 7 in the first embodiment will be described. Figure 9 shows the blowout panel device 100 equipped with a three-bar linkage mechanism 120 according to the second embodiment in the state when the blowout panel is closed. Figure 10 shows the blowout panel device 100 equipped with a three-bar linkage mechanism 120 according to the second embodiment in the state when the blowout panel is open.

[0034] The three-bar linkage mechanism 120 shown in Figure 9 is an open-loop structure with bars on the buffer mechanism 110 side, the intermediate bar, and the blowout panel 1 side, and is a linkage mechanism with 1 degree of freedom. By shortening the length of the beam between the bar on the buffer mechanism 110 side and the intermediate bar, the buffer mechanism 110 can be oriented in the direction of gravity. This allows the buffer mechanism 110 to be placed in narrow parts of the building.

[0035] In other words, the flexible member is a beam member having links, and the beam members are connected in a pre-folded state, and the length of the beam members and the arrangement of the blowout panel 1, beam members and buffer mechanism 110 are adjusted so that the blowout panel 1, beam members and buffer mechanism 110 are aligned in a straight line (see Figure 10) at the door opening angle that activates the buffer mechanism 110, and the load is transmitted.

[0036] <Third Embodiment> The third embodiment is provided with a second buffer mechanism 130 compared to Figure 2 of the first embodiment. Figure 11 shows the structure of the second buffer mechanism 130 according to the third embodiment. In addition to the buffer mechanism 110, a second buffer mechanism 130 consisting of a spring or a spring and a damper is installed at a predetermined position on the opening trajectory of the blowout panel 1 (door) in preparation for when the predetermined limit door opening angle θ1 of the buffer mechanism 110 is exceeded. This ensures that the limit door opening angle θ F Stopping the door before it reaches its limit is also an effective way to prevent damage.

[0037] In other words, the blowout panel device 100 may further have, in addition to the buffer mechanism 110, a second buffer mechanism 130 consisting of a spring or a spring and a damper at a predetermined position on the door's opening trajectory, in case the door opening angle exceeds the limiting door opening angle θ1 of the buffer mechanism 110 for any reason.

[0038] <Variation> Figure 12 shows the blowout panel device 100A equipped with a buffer mechanism 110, with the hinge portion 2 positioned at the top as shown in Figure 1, in the state when the blowout panel is closed. Figure 13 shows the blowout panel device 100A equipped with a buffer mechanism 110, with the hinge portion 2 positioned at the top as shown in Figure 2, in the state when the blowout panel is open. The blowout panel device 100A shown in Figures 12 and 13 comprises a blowout panel 1 that closes an opening 30 in the building of a nuclear-related facility, a hinge portion 2 that fixes the blowout panel 1 (door) to the building structure at the top, and a buffer mechanism 110, one end of which is connected to the building structure and in which a spring 4 and a damper 3, as shown in Figure 3, are arranged in parallel. The blowout panel 1 and the other end of the buffer mechanism 110 are attached via a flexible member (for example, a wire 7).

[0039] When the blowout panel opens, it is closed and opens only under the influence of internal pressure just before opening. After the blowout panel 1 opens, if the hinge part 2 is at the bottom, it rotates in the opening direction due to internal pressure and its own weight; if the hinge part 2 is at the top, it rotates due to the load of internal pressure alone. At this time, the pressure from the steam during the accident is large, and the internal pressure load becomes dominant. Even when the hinge part 2 is at the top, if the buffer mechanism 110 is not installed, the blowout panel 1 will open too far upward by more than 90 degrees, so the buffer mechanism 110 functions effectively.

[0040] As described above, the blowout panel device 100 of this embodiment comprises a blowout panel 1 that closes an opening 30 in the building of a nuclear-related facility, a hinge portion 2 that fixes the blowout panel to the building structure at the top or bottom, and a buffer mechanism 110 with one end connected to the structure and having a spring and damper arranged in parallel. The other end of the blowout panel 1 and the buffer mechanism 110 are attached via a flexible member (for example, a wire 7). When the door of the blowout panel 1 is opened, the door opens almost without load up to a predetermined door opening, and when it exceeds the predetermined door opening, the buffer mechanism 110 operates and the blowout panel stops at a predetermined limited door opening below the limit door opening where damage occurs, and thereafter the blowout panel 1 returns in the direction of closing to the predetermined door opening. Furthermore, since there is virtually no load up to a predetermined door opening angle, the door opens without speed limiting by the buffer mechanism 110. On the other hand, once the door opens beyond the predetermined angle, the door opens with speed limiting by the buffer mechanism 110 (and its damping force).

[0041] Furthermore, the buffer mechanism 110 is normally fixed by being sandwiched between a first support 8 installed on the door and a second support 9 installed on the side of the building structure, and when the blowout panel 1 is opened, the first support 8 moves together with the blowout panel, releasing the buffer mechanism 110 from its fixed position.

[0042] According to this embodiment, it is possible to achieve the conflicting functions of rapid opening and slow stopping of the blowout panel, and the blowout panel device is provided that is fixed by seismic support when the buffer mechanism is not in operation, thus having seismic resistance. [Explanation of Symbols]

[0043] 1. Blowout panel (BOP, door) 2. Hinge section 3 Damper 4 springs 5. Outer cylinder 6 flanges 7 wires 8. First Support 10 Drive unit 10a electric motor 10b gear 11 Clutch 12 arms 30 openings 81 Wire Guide 82,92 Fixed part 83,93 Buffer mechanism receiver 84,94 Support plate 9. Second Support 100, 100A blowout panel device 110 Buffer mechanism 120 3-bar linkage mechanism 130 Second buffer mechanism

Claims

1. Blowout panels that seal off openings in buildings of nuclear-related facilities, A hinge portion for fixing the blowout panel to the building structure at the top or bottom, The system comprises a buffer mechanism having one end connected to the aforementioned frame and having a spring and a damper arranged in parallel, The blowout panel and the other end of the buffer mechanism are attached via a flexible member. When the blowout panel door is opened, the door opens almost without load up to a predetermined opening angle. Beyond that predetermined opening angle, the buffer mechanism activates, stopping the blowout panel at a predetermined limited opening angle below the limiting opening angle at which damage would occur. After that, the blowout panel returns to the predetermined opening angle in the closing direction. A blowout panel device characterized by the following features.

2. The aforementioned buffer mechanism has spring and damping characteristics such that the ratio of the spring force generated when absorbing the impact during the opening operation of the blowout panel to the damping force by the damper is approximately equal, and the load acting on each component is evenly distributed. The blowout panel device according to feature 1.

3. The door opening angle at which the buffer mechanism starts to operate is set to 30 degrees or more and 60 degrees or less, and the door opening angle limit is set to 50 degrees or more and 90 degrees or less, with a difference of 15 degrees or more between the two. The blowout panel device according to feature 1.

4. The blowout panel device according to claim 1, characterized in that the flexible member is a belt, chain, wire, or flexible shaft.

5. The aforementioned flexible member is a beam member having a link, The beam members are connected in a pre-folded state, and the length of the beam members and the arrangement of the blowout panel, beam members, and buffer mechanism are adjusted so that the blowout panel, beam members, and buffer mechanism are aligned in a straight line and the load is transmitted at the door opening angle that activates the buffer mechanism. The blowout panel device according to feature 1.

6. The aforementioned flexible member is connected in a pre-existing loose state, and its length is adjusted so that the looseness disappears at the door opening angle that activates the buffer mechanism. The blowout panel device according to feature 1.

7. The buffer mechanism is normally secured by being sandwiched between a first support installed on the door and a second support installed on the side of the building structure. When the blowout panel is opened, the first support moves together with the blowout panel, releasing the locking mechanism. The blowout panel device according to feature 1.

8. The first support has a split structure that does not hinder the movement of the flexible member when the fixing of the cushioning mechanism is released. The blowout panel device according to feature 7.

9. The flexible member is installed between the split structures and connects to a part of the split structure at a position that does not interfere with the movement of the flexible member, thereby preventing the flexible member from coming off the split structure. The blowout panel device according to feature 8.

10. The blowout panel device further includes, in addition to the buffer mechanism, a second buffer mechanism consisting of a spring or a spring and a damper at a predetermined position on the door's opening trajectory, in case the door opening exceeds the limit of the buffer mechanism for any reason. A blowout panel device according to any one of claims 1 to 9, characterized in that

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