JP7727596B2 - Blowout Panel Device - Google Patents

Description

The present invention relates to a blowout panel device.

Under the new regulations, nuclear facilities will be required to close the openings formed in the building when the blowout panel (BOP) is opened to release pressure that builds up inside the building. The BOP will be required to have an opening and closing function, allowing it to be reclosed after opening, and to ensure the airtightness of the reactor building while it is closed.

The BOP is installed on the main body of the reactor building. The BOP is equipped with fixing clips and chains to prevent the panels from scattering. When the internal pressure of the building rises to a specified level, the clips deform, causing the panels to move outside the building and be released. After release, the panels are suspended by the chains.

The BOP is attached to the building frame using the clips and chains mentioned above, but in order for it to open at the specified pressure and to open and close, it needs a structure that can hold the panel at the specified load and install it on the building without the panel flying off after opening.

For example, Patent Document 1 describes a structure that provides a BOP with an opening and closing function. The document states, "When the internal pressure of the building rises and a stress equal to or greater than a predetermined value acts on a closure panel that is closed in the closed position, the locking member is released and the closure panel is opened. This allows communication between the interior and exterior spaces of the building through the opening, reducing the internal pressure of the building. At this time, the closure panel rotates and opens around a door hinge attached to the first side edge, and the closure panel stops at an open position where the opening angle is restricted by the linear member. This prevents the door hinge, which connects to the periphery of the opening, from being damaged by the force of the opening of the closure panel, and prevents the closure panel from falling when opened. After the closure panel is opened, and the interior of the building has been reliably checked, the wire connected to the closure panel can be wound up by the winding means at an appropriate timing, returning the closure panel to its original closed position and closing the opening."

Japanese Patent Application Laid-Open No. 2019-200191

However, the blowout panel disclosed in Patent Document 1 has a fixed structure using clips (locking members) and opens at a specified pressure through plastic deformation of the metal, making it difficult to ensure that it opens at the specified opening pressure.

The present invention was made to solve the above-mentioned problems, and aims to provide a blowout panel device that can accurately regulate the opening pressure of the blowout panel.

The present invention comprises a blowout panel that opens and closes an opening in a building, and a hinge that supports the blowout panel so that it can rotate freely, the hinge being provided at the top or bottom of the blowout panel and comprising a magnet that closes the blowout panel by magnetic force , the magnet comprising a plurality of structures that can turn the magnetic force ON/OFF, and the adhesive force of the magnet being adjusted by adjusting the number of magnets that are ON .

The present invention provides a blowout panel device that can accurately regulate the opening pressure of the blowout panel.

FIG. 1 is a front view showing an upper hinge type BOP according to a first embodiment. FIG. 2 is a side view showing an upper hinge type BOP according to the first embodiment. FIG. 10 is an explanatory diagram illustrating a mechanism for maintaining the BOP in an open state. FIG. 10 is an explanatory diagram illustrating a BOP fixing structure. FIG. 10 is a perspective view showing a structure for turning on and off magnetic force. FIG. 10 is an explanatory diagram illustrating an attraction force adjustment mechanism of the BOP. FIG. 1 is an explanatory diagram illustrating a magnetic force measurement mechanism using a strain gauge. FIG. 10 is an explanatory diagram illustrating the impact absorbing structure when the BOP is closed. FIG. 10 is an explanatory diagram illustrating a BOP fixing structure. FIG. 10 is a side view showing the BOP fixing structure of FIG. 9 . FIG. 10 is an explanatory diagram showing the interlocking mechanism of the magnetic force ON/OFF structure. FIG. 10 is an explanatory diagram showing a door lifting structure using a winch. FIG. 10 is an explanatory diagram illustrating a fixing structure using a clip and a magnet. FIG. 10 is an explanatory diagram illustrating a temporary boundary formation mechanism for maintenance. FIG. 10 is a front view showing a bottom hinge type BOP according to a second embodiment. FIG. 10 is a side view showing a bottom hinge type BOP according to a second embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment for carrying out the present invention will be described in detail with reference to the accompanying drawings.
(First embodiment)
Fig. 1 is a front view showing a top hinge type BOP according to the first embodiment, and Fig. 2 is a side view showing the top hinge type BOP according to the first embodiment. In Fig. 2, a blowout panel (hereinafter abbreviated as BOP) 23 is shown in a closed state by a solid line, and a state in which the BOP 23 is opened 90 degrees by a two-dot chain line.
As shown in Fig. 1, a blowout panel apparatus 100A (hereinafter abbreviated as BOP apparatus) is installed to open and close an opening 50 formed in the outer wall of a reactor building, and has a structure in which a hinge 1A is installed on top of a BOP 23. The BOP apparatus 100A also includes a BOP 23. The BOP 23 is made of, for example, an aluminum alloy and is formed in the shape of a square plate. Note that the BOP 23 is not limited to being made of aluminum alloy, and may also be made of iron.

A drive unit 2 that rotates and drives the BOP 23 is installed to the side of the hinge 1A. The drive unit 2 is composed of an electric motor 2a and a gear 2b, and the gear 2b is connected to the hinge 1A via the drive shaft 1a. Furthermore, if the BOP 23 opens in the event of an accident, an impact will be applied to the drive shaft 1a, so the BOP device 100A is designed to physically separate it using a clutch 8.

As shown in Figure 2, the BOP device 100A is equipped with an arm 30 that connects the BOP 23 and the hinge 1A. The arm 30 is formed in a roughly L-shape when viewed from the side, and is provided in two locations spaced apart in the left-right direction (see Figure 1). One end of the arm 30 is fixed to the back surface of the BOP 23, and the other end is fixed to the hinge 1A.

Hinge 1A is provided with a ratchet 3 to maintain the BOP 23 in an open state at a predetermined angle. This ratchet 3 is equipped with locking grooves 3a and 3b and a claw 3c to lock the BOP 23 in a predetermined position.

The claw portion 3c is biased by an elastic member (not shown) toward the rotating body on which the locking grooves 3a and 3b are formed. Furthermore, on the opposite side of the claw portion 3c from the rotating body, a claw holder 3d is provided to hold the claw portion 3c in a position where it does not engage with the locking grooves 3a and 3b. This claw holder 3d may retract the claw portion 3c using magnetic force, or it may retract using an electric motor.

3 is an explanatory diagram showing the mechanism for maintaining the BOP in an open state. The left side of FIG. 3 shows the BOP 23 in a closed state, and the right side of FIG. 3 shows the BOP 23 in an open state.
As shown in the left diagram of Figure 3, when the BOP 23 is closed, the pawl 3c is in contact with the rotating body in which the locking grooves 3a and 3b are formed and is biased. From this state, the BOP 23 is physically coupled by the clutch 8 (see Figure 1), and the hinge 1A is driven by internal pressure or the drive unit 2, causing the ratchet 3 to rotate counterclockwise in the figure, and the BOP 23 to operate in the opening direction. Then, as shown in the right diagram of Figure 3, by stopping the drive unit 2 when the pawl 3c is locked in the locking grooves 3a and 3b, the BOP 23 can be maintained open at a predetermined angle.

When closing the BOP 23 from the 90° open position shown in the right diagram of Figure 3 (releasing the ratchet 3), the hinge 1A is further rotated counterclockwise by the electric motor 2a (drive unit 2) while physically coupled by the clutch 8 (see Figure 1). This causes the striker 10, which is fixed to the rotating body, to press the pawl 3c, separating it from the locking groove 3a. The released pawl 3c is held by the pawl holder 3d and does not return to the locking grooves 3a and 3b. Rotating the hinge 1A clockwise rotates the BOP 23 in the closing direction without the pawl 3c engaging the locking grooves 3a and 3b. After the BOP 23 is closed (see the left diagram of Figure 3), the pawl 3c separates from the pawl holder 3d and comes into contact with the rotating body of the ratchet 3.

As shown in Figures 1 and 2, by positioning hinge 1A inside the building, it is possible to prevent the hinge 1A from rusting and becoming stuck due to salt damage, etc. Furthermore, the angle of hinge 1A is designed to ensure the opening area of the existing BOP 23 is maintained from the perspective of pressure reduction.

FIG. 4 is an explanatory diagram showing the BOP fixing structure.
FIG. 4 shows a BOP fixing structure using a magnet 6. A magnetic body 11 is installed on the BOP 23 side, and a rail 4 and a magnet 6, whose position is adjustable by the rail 4, are installed on a mounting plate 7. The mounting plate 7 is fixed along the periphery of an opening 50 in the building. The magnet 6 is, for example, an electromagnet or a permanent magnet. The magnet 6 includes a plate 6a, through which a bolt 5a is inserted. The rail 4 is fixed to the building frame via the mounting plate 7. A groove 4a is formed in the rail 4, and a nut 5b is slidably inserted into the groove 4a. The magnet 6 is fastened to the rail 4 by the bolt 5a and the nut 5b. The groove 4a in the rail 4 extends perpendicular to the paper surface (left-right when viewed from the front in FIG. 1 ). By allowing the position of the magnet 6 to be changed using the rail 4, the attractive force with the BOP 23 can be adjusted.

The magnetic material 11 is embedded in the back surface of the BOP 23 in a position facing the magnet 6. If the BOP 23 is made of aluminum or an aluminum alloy, it is a non-magnetic material and will not be attracted to the magnet, so the magnetic material 11 is attached to the BOP 23.

The mounting plate 7 also has a gasket 12 attached to it. This gasket 12 is located opposite the outer peripheral edge of the back surface of the BOP 23. The gasket 12 is also attached to the entire outer peripheral edge of the BOP 23, including the upper, lower, left, and right edges, and seals the opening 50. As a result, when the BOP 23 closes, the gasket 12 is crushed by the BOP 23, ensuring a tight seal.

In addition, a clearance 60 is formed between the magnet 6 and the magnetic body 11. This prevents the magnetic body 11 from colliding with the magnet 6 and damaging the magnet 6 when the BOP 23 is closed.

As shown in FIG. 1 , multiple magnets 6 are installed along the right edge of the BOP 23, spaced apart in the vertical direction. Multiple magnets 6 are installed along the left edge of the BOP 23, spaced apart in the vertical direction. Multiple magnets 6 are installed along the bottom edge of the BOP 23, spaced apart in the horizontal direction. The number of magnets 6 installed along the bottom edge is greater than the number of magnets 6 installed along the right and left edges. In this way, in the case of an upper hinge type in which the hinge 1A is installed at the top of the BOP 23, concentrating the magnets 6 at the bottom of the BOP 23 increases the moment, allowing for precise adjustment of the opening pressure by adjusting the placement of the magnets 6. Furthermore, compared to conventional structures, the amount of compression of the gasket 12 (described below) can be specified for load control, which is expected to improve airtightness. Note that the mechanism for adjusting the attraction amount is not limited to magnets.

FIG. 5 is a perspective view showing a structure for turning on and off magnetic force.
As shown in Figure 5, a structure 13 (so-called magnet block) that turns the magnet 6 on and off can also be used as a mechanism for adjusting the magnetic force (attraction force). In other words, by installing more structures 13 than the specified amount in advance and turning on the magnetic force of only the required number, it is possible to set the required release pressure. In this case, the structure 13 that turns the magnet 6 on and off is structured so that switching is performed by rotating the north and south poles of the magnet 6 by 90 degrees. A lever (knob) 6b is installed at the tip of the magnet 6, and by rotating the lever 6b, the magnet 6 itself also rotates. Note that the plate 6a is not shown in Figure 5.

FIG. 6 is an explanatory diagram showing the suction force adjustment mechanism of the BOP.
As shown in FIG. 6 , another magnetic force (attraction force) adjustment mechanism is provided by inserting a shielding plate 14 between the magnet 6 and the magnetic body 11 to block the magnetic flux, thereby enabling adjustment of the magnetic force. The shielding plate 14 is made of, for example, iron. The shielding plate 14 can be moved using a cylinder (not shown) or the like, and can be inserted from the bottom of the BOP 23 to adjust the magnetic force. Inserting the shielding plate 14 between the magnet 6 and the magnetic body 11 so as to increase the shielding area can significantly reduce the magnetic flux. A clearance 60 is provided between the magnet 6 and the magnetic body 11 to prevent damage to the magnet 6 due to a direct collision, and the shielding plate 14 is inserted into the clearance 60. Furthermore, to avoid the influence of surrounding instruments and iron structures during magnetic force control, a shielding plate can be installed nearby.

In addition, by measuring the attractive force of the magnet 6 that secures the BOP 23, it is possible to set the release pressure of the BOP 23 with high precision. In this case, as shown in Figure 1, a magnetic flux density meter 15 (see Figure 1) is installed near the magnet 6 as a mechanism for measuring magnetic force. This makes it possible to measure the magnetic flux density emitted from the side of the magnet and convert it into attractive force. The magnetic flux density meter 15 can be selected from a ferrite meter, a gauss meter, or the like. The magnetic flux density meter 15 is arranged in a one-to-one correspondence with each magnet 6.

FIG. 7 is an explanatory diagram showing a magnetic force measurement mechanism using a strain gauge.
As shown in Figure 7, instead of the magnetic flux density measuring device 15, a strain gauge 16 may be installed on the outside of the BOP as a magnetic force measuring mechanism. This makes it possible to measure the amount of distortion of the BOP 23 due to magnetic force and confirm the correlation with the adhesive force. In other words, when the magnet 6 and the magnetic body 11 attract each other, the BOP 23 is attracted to the magnet 6, causing the BOP 23 to deform inward. The degree of this distortion is measured by the strain gauge 16.

FIG. 8 is an explanatory diagram showing the shock absorbing structure when the BOP is closed.
When the BOP 23 is closed, an impact force is applied to the magnet 6, and a structure to absorb the impact force is required to prevent the magnet 6 from being demagnetized and the BOP 23 from being damaged. Therefore, as shown in Figure 8, the impact force can be absorbed by installing a damper 17 on the BOP 23. The damper 17 is, for example, a pneumatic type, and one end of the damper 17 is rotatably connected to the BOP 23, and the other end is rotatably connected to the mounting plate 7 side.

Instead of using a shock-absorbing structure with a damper 17, a mechanism that adjusts the ratchet 3 and gear 2b can be installed on the electric motor 2a, and the positional relationship can be adjusted so that the ratchet 3 is normally active, and the gear 2b is active when the BOP 23 is closed. This allows the BOP 23 to close more gently than if it were to close under its own weight.

The BOP device 100A can also be used when the BOP 23 is opened remotely from the reactor building's central control room or when operated manually. When the BOP 23 is opened by means other than increasing the internal pressure, this can be done using a drive unit 2 (electric motor 2a) or a cylinder mechanism 19, as shown in Figures 9 and 10. Figure 9 is an explanatory diagram showing the BOP fixing structure, and Figure 10 is a side view showing the BOP fixing structure of Figure 9.

As shown in Figure 9, the cylinder mechanism 19 (BOP extrusion mechanism) has a mechanism for pushing the BOP 23 toward the open side and is installed below the BOP 23. A fixed piece 19a extending downward from the BOP 23 is fixed to the bottom of the BOP 23 at a position opposite the cylinder mechanism 19.

As shown in Figure 10, the cylinder mechanism 19 is, for example, an air-operated type, and is composed of an electric motor 19b, a cylinder portion 19c, and a pressing portion 19d. When the electric motor 19b is driven, the pressing portion 19d presses the back surface of the fixed piece 19a, pushing the BOP 23 toward the opening side.

By using the cylinder mechanism 19 in this way, the BOP 23 can be peeled off with a load greater than the attractive force of the magnet 6. The drive unit 2 (see Figure 9) can then open the BOP 23 to a specified angle (e.g., 30° or 90°). The drive unit 2 and cylinder mechanism 19 must have a rated load greater than the attractive force of the magnetic force.

As another embodiment for peeling off the BOP 23, as described in Figure 6, the shielding plate 14 may be inserted between the magnetic poles (between the magnet 6 and the magnetic body 11) when opening to demagnetize it. Alternatively, the magnetic force ON/OFF structures 13 (see Figure 5) may be remotely operated by a cylinder to operate the lever 6b (see Figure 5), and after all structures 13 are turned OFF, the BOP 23 may be opened by the drive unit 2.

As shown in FIG. 11 , multiple magnetic ON/OFF structures 13 (magnets 6) can be interlocked and turned ON/OFF. Specifically, this mechanism comprises a cylinder 40, an interlocking member 41, and a striker 42. The interlocking member 41 extends along the arrangement direction of the multiple magnetic ON/OFF structures 13 (magnets 6). The interlocking member 41 is provided with a striker 42 at a position corresponding to each structure 13, and the striker 42 is configured to engage with a lever 6b. The interlocking member 41 is also connected to the rod of the cylinder 40, and when pushed and pulled by the rod of the cylinder 40, the interlocking member 41 moves in the arrangement direction of the structures 13 (left-right direction in the figure). Pulling the rod of the cylinder 40 turns each lever 6b OFF, as shown by the solid line, and pushing the rod of the cylinder 40 turns each lever 6b ON, as shown by the dashed-dotted line. In this way, by installing the striker 42 and interlocking member 41 at the tip of the cylinder 40, the structure 13 (magnet 6) can be remotely adjusted to be on or off.

FIG. 12 is an explanatory diagram showing a door lifting structure using a winch.
12, the BOP device may be configured to open the BOP by a winch 20 instead of the drive unit 2 (electric motor 2a). This winch 20 is installed above the BOP 23, and the tip of a wire 20a is connected to the bottom of the BOP 23 and is connected to the winch 20 via a pulley. By using such a winch 20, after the BOP 23 is peeled off by the cylinder mechanism 19, the BOP 23 can be lifted up by the winch 20 and opened to a specified angle.

FIG. 13 is an explanatory diagram showing a fixing structure using a clip and a magnet.
As shown in Fig. 13, the BOP device has a structure in which a clip 21 and a shielding plate 14 are added to the configuration shown in Fig. 4 to open and close the BOP 23. The clip 21 maintains the closed state of the BOP 23, keeping the BOP 23 closed. The clip 21 is engaged with a locking portion 50a provided on the opening 50 side and a locking portion 23b provided on the BOP 23 side, and the opening 50 is sealed by the BOP 23.

The BOP device configured in this manner has a fixed structure using only the clip 21, with the demagnetizing shielding plate 14 installed in advance. After the internal pressure increases, the clip 21 deforms into a V shape (see the two-dot chain line), and the clip 21 disengages from the BOP 23, opening the BOP 23 in the W2 direction. At the same time, the shielding plate 14 disengages from between the magnet 6 and the magnetic body 11. After the BOP 23 is opened, it rotates in the W1 direction to close, and the device is fixed using only the magnet 6. Note that this structure has a structure in which the disengaged clip 21 does not interfere with the re-closing operation, or is installed in a position where it does not interfere. Furthermore, any mechanical fastening other than the clip 21 can be used as long as it breaks under a certain load.

FIG. 14 is an explanatory diagram illustrating a temporary boundary formation mechanism for maintenance.
As shown in Figure 14, when performing maintenance on the BOP device, it is necessary to demagnetize the BOP 23 and open it. Maintenance includes replacing the magnet 6 and inspecting the hinge 1A. At this time, the boundary is formed by the BOP 23, so opening the BOP 23 will destroy the boundary. Therefore, in consideration of equipment maintenance work, a mechanism 22 that forms a temporary boundary must be installed inside the building in advance. The boundary-forming mechanism 22 can be made of a shutter, a membrane material, or the like. A shutter can be installed during construction, and a sheet such as a membrane material can be applied before maintenance.

As described above, the BOP device 100A of the first embodiment comprises a BOP 23 that opens and closes the building opening 50, and a hinge 1A that rotatably supports the BOP 23. The hinge 1A is provided above the BOP 23 and includes a magnet 6 that closes the BOP 23 by magnetic force (see Figure 1). This makes it possible to precisely regulate the opening pressure of the BOP 23. Furthermore, by providing the hinge 1A above the BOP 23, it can be used in operations that prioritize closing.

In addition, in the first embodiment, the magnet 6 has multiple structures that can turn the magnetic force ON/OFF, and the magnetic force of the magnets can be adjusted by adjusting the number of magnets that are ON (see Figure 5). This allows the magnetic force (magnetic force) to be set using a simple structure.

Furthermore, in the first embodiment, a rail 4 is provided that allows the magnet 6 to move along the BOP 23, and the attractive force of the magnet 6 can be adjusted by adjusting the position of the magnet 6 (see Figure 4). This makes it possible to set the magnetic force (attractive force) with a simple structure.

In addition, in the first embodiment, a shielding plate 14 that can move freely back and forth is provided between the magnet 6 and the magnetic body 11 (see Figure 6). This allows for more precise setting of the magnetic force (attraction force).

The first embodiment also includes a magnetic flux density meter 15 that measures the magnetic flux density of the magnet 6 (see Figure 1). This makes it possible to measure the magnetic flux density of the magnet 6 with high accuracy.

In addition, instead of the magnetic flux density measuring device 15, a strain gauge 16 may be provided to measure the strain of the BOP 23 (see Figure 7).

In addition, the first embodiment is equipped with a damper 17 that reduces the impact force when the BOP 23 is closed (see Figure 8).

In addition, instead of the damper 17, the drive unit 2 may be provided with a speed reduction mechanism. This prevents the BOP 23 from colliding with the magnet 6 when the BOP 23 is closed, which could result in damage to the magnet 6.

Furthermore, the first embodiment is provided with a cylinder mechanism 19 that presses the BOP 23 in a direction that moves it away from the magnet 6 (see Figures 9 and 10). This allows the BOP 23 to be opened by means other than increasing the internal pressure.

The first embodiment also includes a ratchet 3 that maintains the BOP 23 in an open state (see Figures 2 and 3). This allows the BOP 23 to be maintained in an open state.

Furthermore, in the first embodiment, a drive unit 2 is provided that rotates the BOP 23, and the drive unit 2 and hinge 1A are connected via a clutch 8 (see Figure 1). This prevents damage to the drive unit 2.

Second Embodiment
FIG. 15 is a front view showing a bottom hinge type BOP according to the second embodiment, and FIG. 16 is a side view showing a bottom hinge type BOP according to the second embodiment.
As shown in Fig. 15, the BOP device 100B of the second embodiment has a structure in which a hinge 1B is provided at the bottom of the BOP 23, and a ratchet 3 is provided to maintain the open state of the BOP 23. In Fig. 15, the closed state of the BOP 23 is shown by a solid line, and the open state of the BOP 23 is shown by a two-dot chain line.

The BOP device 100B of the second embodiment comprises a BOP 23 that opens and closes the building opening 50, and a hinge 1B that rotatably supports the BOP 23. The hinge 1B is provided below the BOP 23 and has a magnet 6 that closes the BOP 23 by magnetic force (see Figures 15 and 16). This makes it possible to precisely regulate the opening pressure of the BOP 23. Furthermore, by providing the hinge 1B below the BOP 23, it can be used in operations that prioritize maintaining the open state.

The present invention is not limited to the above-described embodiment, and the configuration of the first embodiment can be appropriately selected and applied to the second embodiment. Furthermore, the structure for maintaining the BOP 23 in the open state may be one in which a brake mechanism is provided in the drive unit (electric motor) without using the ratchet 3.

1A, 1B Hinge 1a Drive shaft 2 Drive unit 2a Electric motor 2b Gear 3 Ratchet (ratchet mechanism)
3a, 3b Engagement groove 3c Claw portion 3d Claw holding portion 4 Rail 4a Groove 5a Bolt 5b Nut 6 Magnet 6a Plate 6b Lever 7 Mounting plate 8 Clutch (clutch mechanism)
10 striker 11 magnetic body 12 packing 13 magnetic force ON/OFF structure (magnetic force ON/OFF structure)
14 Shielding plate 15 Magnetic flux density measuring device 16 Strain gauge 17 Damper 18 Gear 19 Cylinder mechanism 19a Fixed piece 19b Electric motor 19c Cylinder portion 19d Pressing portion 20 Winch 20a Wire 21 Clip 22 Boundary forming mechanism 23 BOP (blowout panel)
30 Arm 40 Cylinder 41 Interlocking member 42 Striker 50 Opening 100A, 100B Blowout panel device

Claims (11)

A blowout panel that opens and closes the building opening,
a hinge that pivotally supports the blowout panel;
the hinge is provided at the top or bottom of the blowout panel;
a magnet for closing the blowout panel by magnetic force ;
The magnet has a plurality of structures that can turn on/off magnetic force,
A blowout panel device characterized in that the attractive force of the magnets is adjusted by adjusting the number of magnets that are turned on . A blowout panel that opens and closes the building opening,
a hinge that pivotally supports the blowout panel;
the hinge is provided at the top or bottom of the blowout panel;
a magnet for magnetically closing the blowout panel;
a rail for moving the magnet along the blowout panel;
A blowout panel device characterized in that the attractive force of the magnet is adjusted by adjusting the position of the magnet . A blowout panel that opens and closes the building opening,
a hinge that pivotally supports the blowout panel;
the hinge is provided at the top or bottom of the blowout panel;
a magnet for magnetically closing the blowout panel;
a shielding plate that moves freely forward and backward between the magnet and the magnetic body provided on the blowout panel ; A blowout panel that opens and closes the building opening,
a hinge that pivotally supports the blowout panel;
the hinge is provided at the top or bottom of the blowout panel;
a magnet for magnetically closing the blowout panel;
a magnetic flux density meter that measures the magnetic flux density of the magnet . A blowout panel that opens and closes the building opening,
a hinge that pivotally supports the blowout panel;
the hinge is provided at the top or bottom of the blowout panel;
a magnet for magnetically closing the blowout panel;
and a strain gauge for measuring the strain of the blowout panel . 6. The blowout panel device according to claim 1, further comprising a damper for absorbing an impact force when the blowout panel is closed. an electric motor for rotating the blowout panel;
6. The blowout panel device according to claim 1 , wherein the electric motor includes a speed reducing mechanism that absorbs an impact force when the blowout panel is closed. 6. The blowout panel device according to claim 1, further comprising a cylinder mechanism that presses the blowout panel in a direction away from the magnet. 6. The blowout panel device according to claim 1, further comprising a ratchet mechanism for maintaining the blowout panel in an open state. an electric motor for rotating the blowout panel;
6. The blowout panel device according to claim 1 , wherein the electric motor includes a brake mechanism for maintaining the blowout panel in an open state. an electric motor for rotating the blowout panel;
6. The blowout panel device according to claim 1, wherein the electric motor and the hinge are connected via a clutch mechanism.