WO2023100382A1

WO2023100382A1 - Storage box and opening/closing device

Info

Publication number: WO2023100382A1
Application number: PCT/JP2022/006520
Authority: WO
Inventors: 央佐々木
Original assignee: 三菱電機株式会社
Priority date: 2021-11-30
Filing date: 2022-02-18
Publication date: 2023-06-08

Abstract

Obtained in the present invention are a storage box and an opening/closing device that make it possible to reduce the weight of the storage box while also preventing foreign matter from entering the storage box.　A storage box (91) houses an opener/closer (100), and has a pressure release hole (91c) provided to a side wall for releasing internal pressure, and a pressure release device (10) attached to the (side wall 91c). The pressure release device (10) is provided with: a pressure release plate (11) comprising a movable part (11c) which is capable of moving between a sealed position for sealing the pressure release hole (91c) and an open position for opening the pressure release hole (91c); and a deformable part (11b) that is elastically deformable and deforms according to the movement of the movable part (11c). When the movable part (11c) is at the open position, a load is applied, due to the elastic force of the deformable part (11b), to the movable part (11c) in a direction of return to the sealed position.

Description

Storage boxes and switchgear

This application relates to storage boxes and opening/closing devices.

A switchgear includes a switch and a storage box such as a protective box that stores the switch and prevents the switch from being exposed to foreign matter such as rain or dust. This storage box is configured to have a high airtightness in order to prevent foreign matter from entering the interior. On the other hand, since there is a possibility that the pressure inside the storage box will increase due to arcing when the current is interrupted, the storage box is provided with a pressure release device for preventing the pressure increase when the current is interrupted. The pressure relief device is configured to prevent a sudden increase in pressure inside the storage box by releasing the gas inside the storage box to the outside when the current is interrupted while maintaining the sealability of the storage box except when the current is interrupted. be. As a configuration for realizing such a pressure release device, a pressure release hole formed in the storage box and a pressure release lid that opens the pressure release hole when the current is interrupted and seals the pressure release hole when the current is not interrupted. is disclosed (see, for example, Patent Document 1). In the pressure release structure of Patent Document 1, an O-ring mounting member is provided around the pressure-releasing hole to form a convex shape, and the pressure-releasing lid is formed in a concave shape so as to cover the pressure-releasing hole, including the O-ring mounting member. It is The pressure-releasing lid utilizes the relationship between the elastic force of the torsion coil spring and the increase in internal pressure when the current is interrupted, and transitions between the open position and the closed position. Further, the pressure release lid is provided with a locked member for holding the position in the closed position. The pressure-releasing lid is held in a closed position by locking the member to be locked with a locking member provided in the pressure-releasing hole, and foreign matter can be prevented from entering the storage box.

JP-A-2003-263944

In the pressure-releasing structure of Patent Document 1, the mass of the pressure-releasing lid is increased due to the recessed shape and attachment of the engaged member compared to the pressure-releasing plate composed only of a simple plate-like member. For this reason, a larger gravity acts on the pressure release lid. Gravity acting on the pressure-releasing lid acts in a direction that delays the movement of the pressure-releasing lid from the closed position to the open position. takes a long time. If the time from current interruption to pressure release is long, it is necessary to increase the strength of the storage box in order to prepare for the pressure rise during that time. invites

The present application discloses a technique for solving the above-described problems, and provides a storage box and an opening/closing device capable of reducing the weight of the storage box while preventing foreign matter from entering the storage box. The purpose is to

The storage box disclosed in the present application is a storage box in which a switch is housed, a pressure release hole is provided in the side wall for releasing the internal pressure, and a pressure release device for the switch is attached to the side wall. The pressure release device of the container includes a movable part that can move between a closed position that seals the pressure release hole and an open position that opens the pressure release hole, and an elastically deformable part that deforms according to the movement of the movable part. The elastic force of the deformation portion applies a load to the movable portion in the direction of returning to the closed position when the movable portion is in the open position.

Further, another form of the storage box disclosed in the present application is a storage box in which a switch is stored, a pressure release hole for releasing the internal pressure is provided in the side wall, and a pressure release device for the switch is attached to the side wall. The box, the pressure release device of the switch, has a movable part that rotates around one end as a central axis and can move between a closed position that seals the pressure release hole and an open position that opens the pressure release hole. A pressure release plate, a support fixed to the side wall on both sides in the direction of the central axis, a shaft penetrating through a through hole provided in the support and supported by the support, fixed to the shaft, and the movable part is sealed. a torsion coil spring that applies a load to the movable part in a direction to hold it in the closed position when it is in the open position, and a torsion coil spring that applies a load to the movable part in a direction to return to the closed position when the movable part is in the open position; has a flat plate-like portion and an arm provided at one end of the plate-like portion and provided with a hole into which a shaft is fitted, and rotates with the shaft as a whole.

According to the storage box disclosed in the present application, it is possible to reduce the weight of the storage box while preventing foreign matter from entering the storage box.

1 is a perspective view of an opening/closing device according to Embodiment 1. FIG. 1 is a front view of a pressure relief device according to Embodiment 1. FIG. FIG. 2 is an exploded view of the parts of the pressure relief device according to Embodiment 1; 1 is a front view of a pressure relief plate according to Embodiment 1; FIG. 4 is a front view showing another example of the pressure relief plate according to Embodiment 1; FIG. 4 is a front view showing another example of the pressure relief plate according to Embodiment 1; FIG. FIG. 4 is a perspective view illustrating a method of fixing the torsion coil spring according to Embodiment 1; FIG. 2 is a sectional view taken along line AA of the pressure relief device according to Embodiment 1, showing a state in which the pressure relief plate is in the closed position; FIG. 2 is a sectional view taken along line AA of the pressure relief device according to Embodiment 1, showing a state in which the pressure relief plate is at the open position; FIG. 10 is a diagram for explaining the return operation of the pressure relief plate; FIG. 10 is a sectional view taken along line AA of the pressure relief device according to Embodiment 2, showing a state in which the pressure relief plate is in the closed position; FIG. 10 is a sectional view taken along line AA of the pressure relief device according to Embodiment 2, showing a state in which the pressure relief plate is at the open position; FIG. 11 is a cross-sectional view of the pressure relief device according to Embodiment 3, taken along the line AA. FIG. 11 is a front view of a pressure relief device according to Embodiment 4;

Embodiment 1.
Embodiment 1 will be described with reference to FIGS. 1 to 8. FIG. FIG. 1 is a perspective view of an opening/closing device according to Embodiment 1. FIG. The switchgear 1000 includes, for example, a power switch 100 and a storage box 91 such as a protection box that stores the switch. The storage box 91 is, for example, a two-tiered box body, and has a highly airtight structure so as to prevent foreign matter from entering the inside. For the sake of explanation, coordinate axes are set as follows. That is, the vertical direction is the z-axis, and the x-axis and the y-axis are set in a direction perpendicular to the z-axis, that is, in the horizontal direction. The x-axis is set along the long side direction of the storage box 91 , and the y-axis is set along the short side direction of the storage box 91 . Regarding the z-axis, the upward direction is the +z-axis direction, and the downward direction is the -z-axis direction. As for the x-axis and the y-axis, as shown in FIG. 1, one side is the +x-axis direction and the +y-axis direction, and the opposite direction is the -x-axis direction and the -y-axis direction positive direction. The upper part 91A of the storage box has a trapezoidal cross section so that the top side is narrower. However, the shape of the storage box 91 is not limited to that shown in FIG.

Pressure relief devices

10A and 10B, ie, switch pressure relief devices, are attached to the outer side surfaces of side walls 91Aa along the short side direction (y-axis direction) of the upper portion 91A. Although not shown in FIG. 1, a pressure release hole is provided in the side wall 91Aa at a position where the pressure release device is attached. In FIG. 1, two pressure release devices are attached to each side wall 91Aa on both sides, but the number and attachment positions of the pressure release devices to be attached are not particularly limited. The pressure release device 10 may be attached to the side wall 91Ab along the long side direction (x-axis direction) of the storage box 91 . In the lower portion 91B, a side wall 91Bb along the long side direction (x-axis direction) is provided with a hole (not shown) through which the busbar 92 passes.
In the following description, the pressure release device 10A will be described as an example.

FIG. 2 is a front view of the pressure relief device according to Embodiment 1, and is a diagram when the pressure relief device 10A is viewed in the +x-axis direction of FIG. Since the same applies to the pressure relief device 10B, it will be simply referred to as the pressure relief device 10 hereinafter.

The pressure relief device 10 is attached to a pressure relief device attachment portion 91d provided at a predetermined position on the side wall 91Aa. The position and range of the pressure release device mounting portion 91d are not particularly limited as long as the pressure release hole 91c formed in the side wall 91Aa and a screw hole required for mounting the pressure release device 10 can be formed. The pressure-releasing device 10 includes a pressure-releasing plate 11 covering the pressure-releasing hole 91c, a cover 12 covering the pressure-releasing plate 11, and two plate-like members arranged on both sides of the movable portion 11c of the pressure-releasing plate 11 in the y-axis direction. A support 13 fixed to a pressure release device mounting portion 91d, a shaft 14 passing through a through hole 13aa provided in the support 13, and a double torsion-shaped torsion coil spring 15 attached to the shaft 14. It has In FIG. 2, two adjacent circular holes are used as the pressure release holes 91c.

The pressure relief plate 11 has the same outer shape as the cover 12, and is configured to prevent a gap from occurring between the cover 12 and the pressure relief device attachment portion 91d when the pressure relief plate 11 is attached to the pressure relief device attachment portion 91d together with the cover 12. It has become. A U-shaped slit 11a is provided in the pressure release plate 11, and a movable portion 11c is provided in a range surrounded by the U-shaped slit 11a. The movable portion 11c moves between a closed position in which the pressure release hole 91c is closed by closely contacting the side wall 91Aa and an open position in which the pressure release hole 91c is opened by separating from the side wall 91Aa. in position. Therefore, the position and range of the movable portion 11c must be configured so that at least the pressure release hole 91c can be sealed. A more detailed configuration of the pressure relief plate 11 will be described later.

The cover 12 is attached to the pressure release device attachment portion 91d. Although not shown in FIG. 2, the cover 12 has an opening corresponding to the movable portion 11c. Moreover, a grippable handle portion 12 a is integrally provided on the upper portion of the cover 12 . The handle portion 12a is configured by projecting both ends in the y-axis direction of the upper portion of the cover 12 upward and connecting the projecting portions on both sides.

The support 13 is integrally fixed to the storage box 91 with the pressure relief plate 11 and the cover 12 by fastening members such as bolts and nuts. The shaft 14 is rotatably supported by the support 13 by passing through the through hole 13aa. Further, axial displacement of the shaft 14 is restricted by interference with the inner wall of the cover 12 at both ends in the axial direction, so that the shaft 14 is prevented from falling out of the through hole 13aa. The torsion coil spring 15 has a pressing portion 15 b that applies the load due to the elastic force of the torsion coil spring 15 to the movable portion 11 c of the pressure release plate 11 .

FIG. 3 is an exploded view of the parts of the pressure relief device according to Embodiment 1, and the dashed-dotted line in FIG. As shown in FIG. 3, a hole 91e into which the bolt 81 is inserted is provided at a predetermined position of the pressure release device mounting portion 91d. The pressure relief device 10 is attached to the storage box 91 (pressure relief device attachment portion 91d) as follows. First, as shown in FIG. 3, the support 13 with the torsion coil spring 15 and the shaft 14 attached thereto is inserted into the cover 12 through the opening 12b provided at the lower end of the cover 12 to form one component. . Next, the pressure relief plate 11 is arranged so as to be sandwiched between the components (cover 12, support 13, shaft 14, and torsion coil spring 15) and the pressure relief device mounting portion 91d, and bolts 81 and nuts 82 are used to secure the pressure relief plate 11. Each component is attached to the pressure relief device mounting portion 91d by fastening and fixing the above components and the pressure relief plate 11 with a screw. At this time, the opening 12c of the cover 12 and the movable portion 11c of the pressure release plate 11 are aligned. In addition, the side surface of the cover 12 on the side of the pressure release device mounting portion 91d is brought into close contact with the pressure release device mounting portion 91d except for the opening 12c.

Each component attached to the pressure release device attachment portion 91d is also provided with a hole for inserting the bolt 81 at a position corresponding to the hole 91e. Further, in Embodiment 1, the pressure relief device 10 is attached to the pressure relief device mounting portion 91d using the fastening members such as the bolts 81 and the nuts 82, but a mounting method using other fixing members such as rivets may also be used. good.

Next, a more detailed configuration of the pressure relief plate 11 will be described. FIG. 4A is a front view of the pressure-releasing plate according to Embodiment 1, and is a view when the pressure-releasing plate 11 is seen in the +x-axis direction of FIG. As described above, the pressure release plate 11 has an outer shape similar to that of the cover 12, and has an outer shape such that the upper portion is partially recessed. A U-shaped slit 11a is provided in the vertical central portion of the pressure release plate 11, and a movable portion 11c is provided in a range surrounded by the U-shaped slit 11a. A deformable portion 11b that extends in the y-axis direction and is elastically deformable is provided at the upper end of the movable portion 11c, at the opening of the U-shaped slit 11a. The movable portion 11c rotates about the y-axis centering on the deformable portion 11b due to elastic deformation of the deformable portion 11b. As a result, the movable portion 11c opens and closes like a hinge, and the movable portion 11c can move between the closed position and the opened position. An area of the pressure release plate 11 other than the area surrounded by the U-shaped slit 11a serves as a fixing portion 11d. A hole 11e into which a bolt 81 is inserted is formed in the fixed portion 11d, and is fixed to the pressure release device mounting portion 91d by a bolt 81 and a nut 82. As shown in FIG. The position and number of the holes 11e correspond to the positions and number of the holes 91e of the pressure release device mounting portion 91d.

FIG. 4B is a front view showing another example of the pressure relief plate according to Embodiment 1. FIG. In the example shown in FIG. 4B, the U-shaped slit 11a is not formed. The pressure release plate 111 extends in the y-axis direction and has an elastically deformable deformable portion 111b at the center in the z-axis direction. The deformable portion 111b is formed across both ends of the pressure release plate 111 in the y-axis direction, with a fixed portion 111d above the deformable portion 111b and a movable portion 111c below the deformable portion 111b. The movable portion 111c rotates about the y-axis around the deformable portion 111b due to elastic deformation of the deformable portion 111b. As a result, the movable portion 111c opens and closes like a hinge, and the movable portion 111c can move between the closed position and the opened position. A hole 11e into which a bolt 81 is inserted is formed in the fixed portion 111d, and is fixed to the pressure release device mounting portion 91d by a bolt 81 and a nut 82. As shown in FIG.

FIG. 4C is a front view showing another example of the pressure relief plate according to Embodiment 1. FIG. The pressure-releasing plate 112 has two linear slits 11f1 and 11f2 extending from the central portion of the pressure-releasing plate 112 in the z-axis direction to the lower end at portions facing each other. extends in the y-axis direction between the linear slit 11f1 and the linear slit 11f2. In the pressure release plate 112, a movable portion 112c is formed between the linear slit 11f1 and the linear slit 11f2. A fixed portion 112d is formed on the end side in the y-axis direction from the linear slit 11f2. The movable portion 112c opens and closes like a hinge, and the movable portion 112c can move between a closed position and an open position. A hole 11e into which a bolt 81 is inserted is formed in the fixed portion 112d, and is fixed to the pressure release device mounting portion 91d by a bolt 81 and a nut 82. As shown in FIG. The linear slit 11f1 and the linear slit 11f2 correspond to the first slit portion and the second slit portion, respectively. In this manner, the pressure release plate may be configured to have two slits in mutually opposing portions, and the area sandwiched between these two slits may be the movable portion.

FIG. 5 is a perspective view explaining a fixing method of the torsion coil spring according to Embodiment 1. FIG. The coordinate axes shown in FIG. 5 indicate directions when the pressure release device 10 is attached to the storage box 91 . The support 13 is formed by bending two plate-like members into an L shape, and is fixed to both sides of the movable portion 11c of the pressure release plate 11 in the y-axis direction. The support body 13 has a side portion 13a which is orthogonal to the y-axis direction and provided with a through hole 13aa through which the shaft 14 penetrates, and a hole which is orthogonal to the side portion 13a (perpendicular to the x-axis direction) and into which the bolt 81 is inserted. (not shown) provided, and a raised portion 13c in which part of the inner side (closer to the movable portion 11c) of the bottom portion 13b is raised in the -x-axis direction, that is, on the shaft 14 side. I have. A gap is provided between the rising portion 13 c and the shaft 14 . The width of this gap is configured to be smaller than the thickness of the windings forming the winding portion 15 a of the torsion coil spring 15 . A hole 13ca is provided in the raised portion 13c. The through holes 13aa provided in the side portions 13a of the supports 13 on both sides face each other. The shaft 14 extends along the y-axis direction and is supported by the supports 13 on both sides by passing through the through holes 13aa on both sides. Note that the supporting member 13 is not limited to a plate-like member as long as it supports the shaft 14 on both sides of the movable portion 11c in the y-axis direction. For example, it may be a box body provided with a hole through which the shaft 14 penetrates and fixed to the pressure release device mounting portion 91d.

The torsion coil spring 15 has a double torsion shape as described above, and is fixed to the shaft 14 by penetrating the shaft 14 through the two winding portions 15a. The winding portion 15a is arranged inside the rising portion 13c, that is, between the movable portion 11c and the rising portion 13c. As described above, the width of the gap between the raised portion 13c and the shaft 14 is smaller than the thickness of the winding wire that constitutes the winding portion 15a. The movement is restricted by the raised portion 13c. One end of the winding portion 15a extends in the -z-axis direction (downward), and the winding portions 15a on both sides form a U-shaped pressing portion 15b. In other words, the U-shaped pressing portion 15b is connected to one end of each of the two winding portions. The pressing portion 15 b serves as an action point of the torsion coil spring 15 . The other end 15c of the winding portion 15a passes through the hole 13ca of the raised portion 13c and engages with the hole 13ca. As a result, the end portion 15 c serves as a fixed end of the torsion coil spring 15 .

FIG. 6 is a cross-sectional view taken along line AA of the pressure relief device according to Embodiment 1, showing a state in which the pressure relief plate is in the closed position. As shown in FIG. 6, when the pressure relief plate 11 is in the closed position, the deformation portion 11b is not deformed, and the pressure relief plate 11 as a whole has a flat plate shape extending in the vertical direction. The movable portion 11 c is in close contact with the pressure release device mounting portion 91 d to close the pressure release hole 91 c and the opening 12 c of the cover 12 . Due to the elastic force of the torsion coil spring 15, the pressing portion 15b applies a load F to the movable portion 11c so as to press it against the pressure release device mounting portion 91d, thereby holding the movable portion 11c in the closed position.

In addition, on the side wall of the cover 12 on the +x-axis direction side (on the side of the storage box 91), the portions other than the opening 12c are fixed to the pressure release device mounting portion 91d without a gap, and are in close contact with the pressure release device mounting portion 91d. An opening 12b is provided at the bottom, and the lower end 12d of the cover 12 on the +x-axis direction side is also in close contact with the pressure release device mounting portion 91d. Therefore, the cover 12 seamlessly covers the outer circumference of the movable portion 11c in the closed position. Foreign matter entering the cover 12 through the opening 12b is prevented from entering the storage box 91 by the movable portion 11c in the closed position. Therefore, the cover 12 having the structure described above prevents foreign matter from entering the storage box 91 not only from the horizontal direction (x-axis direction and y-axis direction) and from above but also from below. be able to.

The pressure release operation by the pressure release device 10 will be described. FIG. 7 is a cross-sectional view taken along line AA of the pressure relief device according to Embodiment 1, showing a state in which the pressure relief plate is at the open position. When the switch 100 housed in the storage box 91 performs a current interruption operation, the pressure inside the storage box 91 rises. As shown in FIG. 7 , the increased pressure increases the load P on the movable portion 11 c of the pressure release plate 11 in the direction toward the outside of the storage box 91 . As described above, the load F is applied to the movable portion 11c mainly by the torsion coil spring 15. However, when the pressure inside the storage box 91 rises and exceeds the first pressure, the load P exceeds the load F. , the deformable portion 11b begins to elastically deform, and the movable portion 11c is separated from the pressure release device mounting portion 91d. The movable portion 11c is pushed by the load P and rotates around the y-axis with the deformation portion 11b as the center. The direction of rotation is the direction in which the movable portion 11c is lifted (the clockwise direction in FIG. 7). The movable portion 11c rotates until its lower end contacts the inner wall of the cover 12 and reaches the open position shown in FIG. Note that the holding portion 15b of the torsion coil spring 15 is also rotated by the rotation of the movable portion 11c. When the movable portion 11c reaches the open position, the lower end of the pressing portion 15b and the lower end of the end portion 15c are also brought into contact with the inner surface of the cover 12. As shown in FIG. The “first pressure” is predetermined by the mass of the movable portion 11 c and the elastic force of the torsion coil spring 15 .

When the movable portion 11c is separated from the pressure relief device mounting portion 91d and the blockage of the pressure relief hole 91c is released, the gas G in the storage box 91 flows out of the storage box 91 through the pressure relief hole 91c and the opening 12c. begin to be released. By discharging the gas G to the outside of the storage box 91 in this manner, the pressure is released. The gas G released to the outside of the storage box 91 flows into the cover 12, but since the cover 12 covers the pressure release hole 91c without gaps, the gas G flows out of the cover 12 only through the opening 12b. released.

When the movable portion 11c is in the open position, the movable portion 11c is subjected to a load P, a reaction force N (not shown) from the inner surface of the cover 12, a load F from the torsion coil spring 15, and an elastic force of the deformable portion 11b. A load FK (not shown in FIG. 7) and a gravity FG (not shown in FIG. 7) are applied. The load P acts to keep the movable portion 11c at the open position, and the reaction force N prevents further rotation of the movable portion 11c. The load F acts to return the movable portion 11c to the closed position as shown in FIG. Further, since the deformable portion 11b tends to return to its original shape, the load FK also acts to restore the movable portion 11c to the closed position. Gravity FG also acts to return the movable portion 11c to the closed position. When the pressure in the storage box 91 decreases due to the pressure release and falls below the second pressure, the force that holds the movable portion 11c at the open position due to the load P changes the movable portion 11c to the closed position due to the load F, the load FK, and the gravity FG. , the movable portion 11c begins to return to the closed position, and finally returns to the closed position. After returning to the closed position, the movable portion 11c is pressed against the pressure release device mounting portion 91d by the pressing portion 15b to close the pressure release hole 91c. The “second pressure” is determined in advance by the mass of the movable portion 11 c, the elastic force of the deformable portion 11 b, and the elastic force of the torsion coil spring 15 .

The return operation of the pressure relief plate 11 will be further described. FIG. 8 is a diagram for explaining the return operation of the pressure relief plate. For comparison, FIG. 8 shows the pressure relief plate 11 in the closed position on the left side and the pressure relief plate 11 in the open position on the right side. First, the gravity FG acts on the center of gravity 11g of the movable portion 11c. has a component in the direction perpendicular to the side of Further, when comparing the state of the open position and the state of the closed position, since the center of gravity 11g in the open position is higher than the center of gravity 11g in the closed position, the open position has greater potential energy with respect to gravity. Therefore, the gravity FG is directed to return to the closed position (counterclockwise around the y-axis in FIG. 8) so that the movable portion 11c returns from the open position to the closed position and the center of gravity 11g returns to the closed position. to rotate the movable portion 11c.

Next, regarding the elastic force of the deformable portion 11b, the deformable portion 11b is not deformed in the state of being in the closed position, and no elastic force is generated. On the other hand, in the open position, the deformation portion 11b is elastically deformed so that the +x side expands and the −x side contracts, and an elastic force FE is generated in the deformation portion 11b so as to cancel this elastic deformation. . Due to the elastic force FE, a load FK acts on the movable portion 11c in the open position in the direction of returning to the closed position.

Furthermore, as described above, the load F acts on the movable portion 11c in the direction of returning to the closed position from the torsion coil spring 15 (not shown in FIG. 8). As described above, the pressure release device 10 is configured to automatically return the movable portion 11c of the pressure release plate 11 from the open position to the closed position using the load F, the gravity FG, and the load FK.

The pressure release plate 11 is made of a thin plate made of an elastically deformable resin material. For example, it is conceivable to construct the pressure relief plate 11 using insulating paper containing aramid polymer fibers. The thickness of the pressure relief plate 11 is not limited, but the thinner it is, the lighter the pressure relief plate 11 is, and the less the load caused by the impact and vibration caused by the operation of the switch 100, the pressure relief plate 11 is held in the closed position. The load (closing load) for closing can be made smaller. When the closing load is smaller, a smaller torsion coil spring 15 can be used, and the size and weight of the pressure relief device 10 can be reduced. Further, when the pressure release plate 11 is configured to be thinner, the elastic force of the deformable portion 11b and the gravitational force acting on the movable portion 11c are also reduced. As described above, the elastic force of the deformable portion 11b and the gravity acting on the movable portion 11c act to move the movable portion 11c to the closed position. easier to move to Therefore, when the current interrupting operation is performed by the switch 100 and the pressure inside the storage box 91 rises, the movable portion 11c moves to the open position in a shorter period of time. can be suppressed more. In this case, the required strength of the storage box 91 can be further reduced, and the structure of the storage box 91 can be simplified and the weight of the storage box 91 can be further reduced.

On the contrary, when the thickness of the pressure relief plate 11 is increased, the strength of the pressure relief plate 11 can be increased, although the effects such as weight reduction described above are not as good as when the pressure relief plate 11 is configured to be thin.

According to Embodiment 1, it is possible to reduce the weight of the storage box while preventing foreign objects from entering the storage box. In other words, the movable portion of the pressure relief plate of the first embodiment is configured to return from the open position to the closed position using only the elastic force of the pressure relief plate itself, the elastic force of the torsion coil spring, and gravity. Therefore, the movable part of the pressure relief plate can be realized simply and lightly. Since the pressure is released more quickly when the pressure release hole is more widely opened, the faster the movable portion moves from the closed position to the open position, the faster the pressure is released. When the weight of the movable part is reduced as described above, considering the influence of gravity, the lighter the movable part, the faster the movement from the closed position to the open position is performed, and the quicker the pressure is released, the more quickly the storage box can be moved. The internal pressure rise can be suppressed more effectively. If the pressure rise in the storage box can be suppressed more effectively, the strength required for the storage box can be reduced. As a result, the structure of the storage box can be simplified and the weight of the storage box can be reduced. In addition, since the top and sides of the pressure relief plate are covered with a cover, foreign matter is prevented from entering the storage box.

It is generally known that if the pressure inside the storage box rises when the current is cut off, the arc inside the arc extinguishing chamber inside the switch 100 is likely to ignite again. When the arc re-ignition occurs, the arc voltage generated by the switch 100 is reduced. Since it also has the effect of reducing

In addition, since the handle is integrated into the upper part of the cover, there is no need to separately provide a handle that serves as a handle when transporting the storage box, and the number of parts can be reduced.

In addition, the winding portion is arranged so as to be sandwiched between the raised portion provided on the support and the movable portion of the pressure discharge plate, and the width of the gap between the raised portion and the shaft is the width of the winding that constitutes the winding portion. , the winding portion is configured such that movement of the winding portion along the axial direction of the shaft is restricted by the rising portion. As a result, even if vibrations and shocks occur due to the closing and opening operations of the pressure release device, the position of the torsion coil spring is fixed without shifting along the axial direction of the shaft. Therefore, it is possible to suppress variations in the load applied to the pressure release plate.

In addition, since the cover covers the pressure release hole without gaps, the gas released to the outside of the storage box 91 during pressure release is released downward from the cover only through the opening at the lower end of the cover. As a result, since the substance released together with the gas from the storage box is discharged only downward, it is possible to prevent the substance from scattering over a wide area, and to suppress the adverse effects of the substance on the peripheral equipment. can be done.

In the open position, the lower end of the movable portion of the pressure relief plate, the fixed end of the torsion coil spring, and the lower end of the pressing portion abut against the inner surface of the cover, so that the movable portion and the torsion coil are displaced by the reaction force from the inner surface of the cover. The amount of movement of the spring is limited, and damage to the pressure relief plate and torsion coil spring can be prevented.

Embodiment 2.
Next, Embodiment 2 will be described with reference to FIGS. 9 and 10. FIG. 1 to 8 are denoted by the same reference numerals, and description thereof will be omitted. FIG. 9 is a cross-sectional view taken along line AA of the pressure relief device according to Embodiment 2, showing a state in which the pressure relief plate is in the closed position. FIG. 10 is a diagram showing a state in which the pressure release plate is in the open position. Pressure-releasing device 20 is obtained by replacing pressure-releasing plate 11 of pressure-releasing device 10 in Embodiment 1 with pressure-releasing plate 21 shown in FIGS. The pressure release plate 21 has a plate-like portion and an arm (described later), and is made of a material that is difficult to elastically deform. Therefore, unlike the deformable portion 11b of the pressure-releasing plate 11, the pressure-releasing plate 21 does not have a portion that is elastically deformed, and the entire plate-like portion of the pressure-releasing plate 21 serves as the movable portion 21c. The pressure relief plate 21 is made of, for example, a ferrous metal such as iron or stainless steel, a nonferrous metal such as aluminum or copper, or an insulating material (thermoplastic resin or thermosetting resin) such as epoxy resin or polyethylene resin. It has greater rigidity than the pressure relief plate 11 . Although the thickness of the pressure release plate 21 is not particularly limited, it is preferable to make it thinner from the viewpoint of weight reduction.

The pressure release plate 21 is provided with an arm 27 at the upper end of the movable portion 21c. The arm 27 is made of metal, for example, and configured to stand up from the movable portion 21c. When the movable portion 21c is in the closed position as shown in FIG. 9, the arm 27 extends from the movable portion 21c in the −x-axis direction. The arm 27 is provided with a hole 27a into which the shaft 14 is fitted, and the arm 27 and the movable portion 21c are fixed to the shaft 14 which is fitted into the hole 27a. This configuration allows the movable portion 21 c to rotate together with the shaft 14 . A torsion coil spring 15 is attached to the shaft 14, and the load of the torsion coil spring 15 holds the movable portion 21c in the closed position as in the first embodiment. Also, the movable portion 21c moves from the closed position to the open position due to the increase in pressure inside the storage box 91 when the current is interrupted. Further, unlike the pressure release plate 11 of the first embodiment, although it is not affected by elastic deformation and elastic force, it is the same as the first embodiment in that it returns to the closed position after the pressure is released. When the load F and the gravity FG (not shown in FIGS. 9 and 10) due to the torsion coil spring 15 exceed the load P (not shown in FIGS. 9 and 10) due to the pressure inside the storage box 91, the load F and the gravity FG The pressure relief plate 21 in the open position returns to the closed position.

The movable portion 21c has a cut portion 21f in which the corner of the upper end facing the storage box 91 is cut to remove the edge. When the movable portion 21c moves from the closed position to the open position, the upper end of the movable portion 21c facing the storage box 91 is pressed against the pressure release device mounting portion 91d. At this time, if there is an edge, the edge may interfere with the -x side surface of the pressure release device mounting portion 91d, hindering smooth movement from the closed position to the open position, but the cut portion 21f is formed. As a result, the cut portion 21f slides on the -x side surface of the pressure release device mounting portion 91d. Therefore, smooth movement of the movable portion 21c from the closed position to the open position is not hindered.
Others are the same as those of the first embodiment, so description thereof will be omitted.

According to the second embodiment, the pressure release plate is made of a metal material or a resin material that has greater rigidity and hardly undergoes elastic deformation. Therefore, the flame retardancy and strength of the pressure relief plate can be further enhanced.

Embodiment 3.
Next, Embodiment 3 will be described with reference to FIG. 1 to 10 are denoted by the same reference numerals, and description thereof will be omitted. FIG. 11 is a cross-sectional view taken along line AA of the pressure relief device according to Embodiment 3, showing a state in which the pressure relief plate is in the closed position. The pressure relief device 30 is the same as the pressure relief device 10 of the first embodiment, except that the torsion coil spring 15 is omitted. Further, along with the omission of the torsion coil spring 15, the shaft 14 and the support 13 are also omitted. As described above, since the deformation portion 11b has elasticity, the pressure release plate 11 alone can provide a certain degree of sealing performance. That is, when the movable portion 11c is in the closed position, the elastic force of the deformable portion 11b applies a load to the movable portion 11c in the direction of holding it in the closed position. Further, as can be seen from FIG. 8, when the movable portion 11c is at the open position, the elastic force of the deformation portion 11b applies a load to the movable portion 11c in the direction of returning to the closed position. That is, even without the load F of the torsion coil spring 15, the return operation from the open position to the closed position is realized by the load due to the elastic force of the deformation portion 11b and the gravity FG.
Others are the same as those of the first embodiment, so description thereof will be omitted.

According to Embodiment 3, since the torsion coil spring, shaft, and support are omitted, the configuration of the pressure relief device can be further simplified, and the weight of the pressure relief device can be further reduced.

Embodiment 4.
Next, Embodiment 4 will be described with reference to FIG. 1 to 12 are denoted by the same reference numerals, and description thereof will be omitted. 12 is a front view of a pressure relief device according to Embodiment 4. FIG. The pressure release device 40 is constructed by omitting the handle portion 12a from the cover 12 of the first embodiment as a cover 42. As shown in FIG.
Others are the same as those of the first embodiment, so description thereof will be omitted.

According to Embodiment 4, the handle is omitted from the cover, so the cover is downsized. Therefore, it is possible to reduce the size and weight of the pressure relief device.

While this application describes various exemplary embodiments and examples, various features, aspects, and functions described in one or more embodiments may not apply to particular embodiments. can be applied to the embodiments singly or in various combinations.
Therefore, countless modifications not illustrated are envisioned within the scope of the technology disclosed in the present application. For example, modification, addition or omission of at least one component, extraction of at least one component, and combination with components of other embodiments shall be included.

10, 10A, 10B, 20, 30, 40 pressure release device, 11, 111, 112, 21 pressure release plate, 11a U-shaped slit, 11b, 111b, 112b deformation portion, 11c, 111c, 112c, 21c movable portion, 11d, 111d, 112d fixing part, 11f1, 11f2 linear slit, 12, 42 cover, 12a handle part, 12b, 12c opening part, 12d lower end part, 13 support body, 13a side part, 13aa through hole, 13b bottom part, 13c rising part , 14 shaft, 15 torsion coil spring, 15a winding part, 15b pressing part, 15c end part, 21f cut part, 27 arm, 91 storage box, 91Aa, 91Ab side wall, 91c pressure release hole, 91d pressure release device mounting part, 100 switch, 1000 switchgear, F load, FG gravity, FE elastic force, FK load, P load

Claims

A storage box in which a switch is housed, a side wall is provided with a pressure release hole for releasing internal pressure, and a pressure release device for the switch is attached to the side wall,
The pressure release device for the switch,
a movable portion movable between a closed position for sealing the pressure release hole and an open position for opening the pressure release hole; a pressure relief plate having
The storage box, wherein the elastic force of the deformable portion applies a load to the movable portion in the direction of returning to the closed position when the movable portion is at the open position.
A first slit portion and a second slit portion facing each other are formed in the pressure release plate, and the movable portion is formed in a region sandwiched between the first slit portion and the second slit portion. The storage box according to claim 1, wherein:
The storage box according to claim 1, wherein the pressure release plate is provided with a U-shaped slit, and the movable portion is provided in a range surrounded by the U-shaped slit.
When the movable portion is at the closed position, a load is applied to the movable portion in a direction to maintain the closed position, and when the movable portion is at the open position, the movable portion is applied in a direction to return to the closed position. 4. The storage box according to any one of claims 1 to 3, further comprising a load-applying torsion coil spring.
The movable part is a movable part that rotates about one end as a central axis,
further comprising supports fixed to the side walls on both sides in the direction of the central axis, and shafts penetrating through holes provided in the supports and supported by the supports,
5. The storage box according to claim 4, wherein said torsion coil spring is fixed to said shaft.
A storage box in which a switch is housed, a side wall is provided with a pressure release hole for releasing internal pressure, and a pressure release device for the switch is attached to the side wall,
The pressure release device for the switch,
a pressure release plate having a movable portion that rotates about one end as a central axis and is movable between a closed position that seals the pressure release hole and an open position that opens the pressure release hole;
supports fixed to the side walls on both sides in the direction of the central axis;
a shaft that passes through a through-hole provided in the support and is supported by the support;
It is fixed to the shaft, applies a load to the movable part in a direction to hold it in the closed position when the movable part is in the closed position, and returns to the closed position when the movable part is in the open position. a torsion coil spring that applies a load to the movable part in the direction of
The pressure relief plate has a plate-like portion and an arm provided at one end of the plate-like portion and provided with a hole into which the shaft is fitted, and rotates as a whole together with the shaft. Characteristic storage box.
The torsion coil spring includes two winding portions through which the shaft penetrates, and a pressing portion formed in a U-shape and connected to one end of each of the two winding portions to apply a load to the movable portion. 7. The storage box according to claim 5 or 6.
The support has two plate-shaped members each bent into an L-shape, and the two plate-shaped members are orthogonal to the central axis and have a side portion provided with the through hole and a side portion. and a raised portion formed by raising a portion of the bottom closer to the movable portion toward the shaft, and the raised portion is arranged in the direction of the central axis in the direction of the central axis. 8. The storage box according to claim 7, wherein the winding portion is sandwiched between the movable portion and a gap having a width smaller than the thickness of the winding wire forming the winding portion is provided between the winding portion and the shaft.
The storage box according to claim 6, wherein the pressure relief plate has an upper corner cut on the side wall side.
The storage box according to any one of claims 1 to 9, further comprising a cover that covers the upper side and sides of the pressure release plate and has an opening at the lower end.
further comprising a cover that covers the top and sides of the pressure relief plate and has an opening at the bottom end;
9. The storage box according to claim 7, wherein the pressing portion abuts on the inner surface of the cover when the movable portion is in the open position.
12. The storage box according to claim 10, wherein a grippable handle is integrally provided on the upper part of the cover.
The movable portion is normally held at the closed position, and moves to the open position when the pressure rises due to current interrupting operation of the switch and the pressure exceeds a predetermined first pressure. 13. The storage box according to any one of claims 1 to 12, wherein the pressure inside the storage box is released, and when the pressure drops below a predetermined second pressure, the storage box returns to the closed position. box.
A switching device comprising the storage box according to any one of claims 1 to 13 and a switch housed in the storage box.