Water shutoff device

Abstract

The objective is to prevent the gate from blocking the flow path when unnecessary, while ensuring that the gate properly closes the flow path when water enters. [Solution] The water-stopping device 100 comprises a cylindrical casing 1 that partitions the flow path 10, a door body 2 that rotates around a rotation axis X to transition between a downed state that opens the flow path 10 and an upright state that closes the flow path 10, thereby opening and closing the flow path 10, a counterweight 3 connected to the door body 2, and a second holding mechanism 5 that holds the door body 2 in the upright state.

Description

Technical Field

[0001] The technology disclosed herein relates to a water stop device.

Background Art

[0002] Conventionally, a water stop device for preventing water from entering a building through a flow path has been known. For example, Patent Document 1 discloses a water stop device that closes the flow path with a door body to prevent water from entering the building when water enters the flow path of the building.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, the flow path where the water stop device is installed is usually open to allow air to circulate. Therefore, it is not preferable for the door body to close the flow path when there is no water intrusion. On the other hand, it is desired that the door body closes the flow path appropriately when water intrudes.

[0005] The technology disclosed herein has been made in view of such points, and the object thereof is to prevent the door body from closing the flow path when it is unnecessary, and to appropriately close the flow path with the door body when water intrudes.

Means for Solving the Problems

[0006] The water stop device disclosed herein includes a cylindrical casing that partitions the flow path, a door body that rotates around a rotation axis and transitions between a fallen state that opens the flow path and a standing state that closes the flow path to open and close the flow path, a counterweight connected to the door body, and a holding mechanism that holds the door body in the standing state. [Effects of the Invention]

[0007] According to the aforementioned water-stopping device, the door body can prevent it from closing the flow path when unnecessary, while also being able to properly close the flow path when water enters. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view of the water-stopping device when the door is in the lowered position. [Figure 2] Figure 2 is a perspective view of the water-stopping device when the door is in the upright position. [Figure 3] Figure 3 is a schematic diagram showing an example of the application of a water-stopping device to a building. [Figure 4] Figure 4 is a cross-sectional view of the water-stopping device from the front when the door is in the lowered position. [Figure 5] Figure 5 is a cross-sectional view of the water-stopping device from the side when the door is in the lowered position. [Figure 6] Figure 6 is a cross-sectional view of the water-stopping device as seen from the front when the door is in the upright position. [Figure 7] Figure 7 is a cross-sectional view of the water-stopping device as seen from the side when the door is in the upright position. [Figure 8] Figure 8 is a side view of the water-stopping device in the lowered position of the door body. [Figure 9] Figure 9 is a side view of the water-stopping device in the upright position of the door body. [Figure 10] Figure 10 is a schematic diagram illustrating an example of the arrangement of the center of gravity of the door and counterweight when the door is in an upright position. [Figure 11] Figure 11 is a schematic diagram illustrating an example of the arrangement of the center of gravity of the door and counterweight when the door is in a collapsed state. [Figure 12] Figure 12 is a side view of a modified example of a water-stopping device in the upright position of the door body. [Modes for carrying out the invention]

[0009] Hereinafter, exemplary embodiments will be described in detail with reference to the drawings. Figure 1 is a perspective view of the water-stopping device 100 when the door body 2 is in a lowered position. Figure 2 is a perspective view of the water-stopping device 100 when the door body 2 is in an upright position.

[0010] The water-stopping device 100 comprises a cylindrical casing 1 that partitions the flow path 10, a door body 2 that rotates around a rotation axis X to transition between a downed state that opens the flow path 10 and an upright state that closes the flow path 10, thereby opening and closing the flow path 10, a counterweight 3 connected to the door body 2 that generates a moment to rotate the door body 2 from the downed state to the upright state, a first holding mechanism 4 that holds the door body 2 in the downed state, and a second holding mechanism 5 that holds the door body 2 in the upright state. Note that a portion of the casing 1 is omitted in Figures 1 and 2.

[0011] The internal space of the casing 1 is the flow path 10. The door body 2 is normally in a downed state, opening the flow path 10. The door body 2 is held in the downed state by the first holding mechanism 4. When water enters the flow path 10, buoyancy acts on the downed door body 2. The buoyancy generates a moment that rotates the door body 2 from the downed state to the upright state. When the buoyancy becomes large, the holding of the door body 2 by the first holding mechanism 4 is released. The counterweight 3 generates a moment that rotates the door body 2 to the upright state, at least when the holding of the door body 2 by the first holding mechanism 4 is released. The counterweight 3 may also generate a moment that rotates the door body 2 from the downed state to the upright state when the door body 2 is held by the first holding mechanism 4, i.e., in the downed state. Once the holding of the door body 2 by the first holding mechanism 4 is released, the door body 2 rises from the downed state due to the buoyancy of the water and the moment of the counterweight 3. The gate body 2 quickly rises from a tipped position due to the buoyancy of the water and the moment of the counterweight 3. When the gate body 2 is in the upright position, it closes the flow path 10. The second holding mechanism 5 holds the gate body 2 in the upright position. With the water-stopping device 100, the upright position of the gate body 2, i.e., the closed state of the flow path 10, can be properly maintained by the holding of the gate body 2 by the second holding mechanism 5.

[0012] FIG. 3 is a schematic diagram showing an application example of the water stop device 100 to the building 9. For example, the water stop device 100 is arranged in the air flow path 91 of the building 9. Normally, the water stop device 100 lies down the door body 2 to open the flow path 10. Thereby, the air can flow in the flow path 10. When water enters the flow path 91, the water stop device 100 stands up the door body 2 to close the flow path 10. Thereby, the water cannot flow in the flow path 10. Thus, the water stop device 100 prevents water from entering the building 9 through the flow path 91.

[0013] For example, the water stop device 100 is arranged between the two flow paths 91 so as to communicate with the two flow paths 91. Alternatively, the water stop device 100 may be arranged at the end of the flow path 91 so as to communicate with the flow path 91. Alternatively, the water stop device 100 may be arranged in the flow path 91. For example, the flow path 91 is a duct, a ventilation opening or an air supply opening.

[0014] FIG. 4 is a cross-sectional view of the water stop device 100 when viewed from the front in the state where the door body 2 lies down. FIG. 5 is a cross-sectional view of the water stop device 100 when viewed from the side in the state where the door body 2 lies down. FIG. 4 is a cross-sectional view of the water stop device 100 taken along line IV-IV in FIG. 5. FIG. 5 is a cross-sectional view of the water stop device 100 taken along line V-V in FIG. 4. Openings are formed at both ends of the casing 1.

[0015] As shown in FIGS. 1 and 4, the casing 1 may have a door stop 15 which is an annular frame body arranged in the flow path 10 and surrounding the opening 15a. The standing door body 2 contacts the door stop 15. The outer peripheral edge of the door stop 15 is joined to the inner peripheral surface of the casing 1. There is no gap between the outer peripheral edge of the door stop 15 and the inner peripheral surface of the casing 1. The air flow path 10 of the casing 1 can only flow air etc. through the opening 15a.

[0016] For example, as shown in FIG. 4, the casing 1 is a rectangular tube with a substantially rectangular cross-section. The casing 1 may include a ceiling wall 11 that extends in a substantially horizontal direction, a bottom wall 12 that faces the ceiling wall 11 and extends in a substantially horizontal direction, a first side wall 13 that is connected to the ceiling wall 11 and the bottom wall 12 and extends in a substantially vertical direction, and a second side wall 14 that faces the first side wall 13 and is connected to the ceiling wall 11 and the bottom wall 12 and extends in a substantially vertical direction. The inner peripheral surface of the casing 1 may include an upper surface 11a that extends in a substantially horizontal direction, a lower surface 12a that faces the upper surface 11a and extends in a substantially horizontal direction, a first side surface 13a that is connected to the upper surface 11a and the lower surface 12a and extends in a substantially vertical direction, and a second side surface 14a that faces the first side surface 13a and is connected to the upper surface 11a and the lower surface 12a and extends in a substantially vertical direction. The ceiling wall 11 includes the upper surface 11a. The bottom wall 12 includes the lower surface 12a. The first side wall 13 includes the first side surface 13a. The second side wall 14 includes the second side surface 14a.

[0017] As shown in FIG. 5, the door body 2 is disposed upstream of the door stop 15. Here, the upstream means the upstream of the flow when water enters the flow path 10. Incidentally, the downstream means the downstream of the flow when water enters the flow path 10.

[0018] A watertight rubber 15b is attached to the portion of the door stop 15 that contacts the door body 2. The watertight rubber 15b is attached to the surface of the door stop 15 that faces the upstream side. As shown in FIG. 1, the watertight rubber 15b is formed in an annular shape so as to surround the opening 15a.

[0019] When the casing 1 is a rectangular tube, the door stop 15 is formed, for example, in a substantially rectangular annular shape. The outer peripheral edge of the door stop 15 is joined to the upper surface 11a, the lower surface 12a, the first side surface 13a, and the second side surface 14a of the casing 1. For example, the opening 15a is a substantially rectangle having an upper side and a lower side that face each other and extend in a substantially parallel direction, and two side sides that face each other and extend in a substantially vertical direction.

[0020] The rotation axis X extends in a substantially horizontal direction. The rotation axis X extends in a direction intersecting the flow path 10, preferably in a direction substantially perpendicular to the flow path 10. As shown in Figure 5, the rotation axis X is located at the first end 21, which is one end of the door body 2. The second end 22, which is the end of the door body 2 opposite to the rotation axis X, is located upstream of the rotation axis X when the door body 2 is in a collapsed state. In other words, when the door body 2 is in a collapsed state, the second end 22 is located upstream of the first end 21. When the door body 2 is in an upright state, the second end 22 is located above the first end 21.

[0021] For example, the door body 2 has a shaft 23, as shown in Figure 4. The shaft 23 is supported by the casing 1 via bearings 16, with its axis coinciding with the axis of rotation X. The shaft 23 is rotatable about the axis of rotation X. Two bearings 16 are located in the casing 1. For example, the two bearings 16 are mounted on the first side wall 13 and the second side wall 14.

[0022] Figure 6 is a cross-sectional view of the water-stopping device 100 from the front when the door body 2 is in the upright position. Figure 7 is a cross-sectional view of the water-stopping device 100 from the side when the door body 2 is in the upright position. Figure 6 is a cross-sectional view of the water-stopping device 100 along the line VI-VI in Figure 7. Figure 7 is a cross-sectional view of the water-stopping device 100 along the line VII-VII in Figure 6. As shown in Figures 6 and 7, when the door body 2 is in the upright position, it contacts the door stop 15 with the opening 15a completely closed. The door body 2 closes the flow path 10 by closing the opening 15a. On the other hand, as shown in Figures 4 and 5, when the door body 2 is in the reclined position, it moves away from the door stop 15 and opens the opening 15a. The door body 2 opens the flow path 10 by opening the opening 15a.

[0023] For example, the door body 2 is formed in the shape of a flat, roughly rectangular parallelepiped, that is, a roughly square plate. The door body 2 is hollow. As shown in Figure 1, the door body 2 has a roughly square contact surface 24 that contacts the door stopper 15 when it is upright. The contact surface 24 contacts the watertight rubber 15b of the door stopper 15 when the door body 2 is upright. For example, the rotation axis X is positioned near one side of the contact surface 24 and roughly parallel to that side.

[0024] As shown in Figure 5, the lower end of the opening 15a is positioned higher than the bottom of the flow channel 10 upstream of the door stop 15. The bottom of the flow channel 10 is, for example, the lower surface 12a of the casing 1. The door stop 15 can dam up incoming water up to the height of the lower end of the opening 15a. At least a portion of the collapsed door body 2 is located in the space upstream of the door stop 15 and below the lower end of the opening 15a. The collapsed door body 2 receives buoyancy from the water dammed by the door stop 15. This buoyancy promotes the door body 2 to stand up from its collapsed state. The lower end of the opening 15a is the bottom edge of the rectangle that forms the opening 15a.

[0025] For example, as shown in Figure 5, the door stopper 15 is positioned inward from the upstream and downstream ends of the casing 1 in the flow direction of the flow path 10. That is, the door stopper 15 divides the internal space of the casing 1 into a space upstream of the door stopper 15 and a space downstream of the door stopper 15. Hereinafter, the space upstream of the door stopper 15 within the internal space of the casing 1 will be simply referred to as the "upstream space 10a," and the space downstream of the door stopper 15 within the internal space of the casing 1 will be simply referred to as the "downstream space 10b."

[0026] The door body 2 may be located inside the casing 1. For example, the door body 2 is located in the upstream space 10a. A spacer 17 is located at the bottom of the upstream space 10a to support the door body 2 in a collapsed state while maintaining the distance between the door body 2 and the bottom. The collapsed door body 2 rests on the spacer 17. The collapsed door body 2 may be approximately parallel to the bottom of the upstream space 10a. The bottom of the upstream space 10a is, for example, the lower surface 12a of the casing 1. The bottom of the upstream space 10a may be located lower than the lower end of the opening 15a.

[0027] The counterweight 3 is connected to the door body 2 so as to rotate integrally with the door body 2 around the axis of rotation X. For example, as shown in Figure 4, the counterweight 3 is non-rotatably connected to the shaft 23 of the door body 2. When the shaft 23 rotates around the axis of rotation X, the counterweight 3 also rotates integrally with the shaft 23.

[0028] The counterweight 3 may be located outside the casing 1. For example, the shaft 23 penetrates the casing 1 and extends to the outside of the casing 1. The counterweight 3 is attached to the portion of the shaft 23 that is outside the casing 1.

[0029] Figure 8 is a side view of the water-stopping device 100 in the collapsed state of the door body 2. Figure 9 is a side view of the water-stopping device 100 in the upright state of the door body 2. The overall center of gravity G of the door body 2 and counterweight 3 is positioned eccentrically from the axis of rotation X and is positioned to generate a moment in the door body 2 toward the upright state when the holding of the door body 2 by the first holding mechanism 4 is released (i.e., when the door body 2 rotates to the extent that it is released from the collapsed state by the first holding mechanism 4). For example, in the collapsed state of the door body 2, the center of gravity G is located in the region opposite to the door body 2 with respect to a reference line R that extends vertically perpendicular to the axis of rotation X. The center of gravity G is located in a location other than directly above and directly below the axis of rotation X. By positioning the center of gravity G in a location other than directly below the axis of rotation X, a moment around the axis of rotation X is generated by gravity acting on the center of gravity G. By positioning the center of gravity G in a region opposite to the door body 2 from the axis of rotation X, a moment is generated that causes the door body 2 to stand upright.

[0030] Furthermore, the center of gravity G is positioned so as not to generate a moment around the axis of rotation X that would cause the upright door body 2 to collapse. For example, in both the upright and collapsed states of the door body 2, the center of gravity G is located in the region opposite to the door body 2 or on the reference line R, which extends vertically perpendicular to the axis of rotation X. In other words, when the door body 2 transitions to the upright state, the center of gravity G does not pass directly below the axis of rotation X. If the center of gravity G were to rotate until it passed directly below the axis of rotation X, the direction of the moment would reverse. That is, the moment that causes the door body 2 to stand up would change into a moment that causes the door body 2 to collapse.

[0031] The first holding mechanism 4 holds the door body 2 in a collapsed state. In other words, the first holding mechanism 4 maintains the door body 2 in a collapsed state. The first holding mechanism 4 releases its hold on the door body 2 when a moment exceeding the holding force of the first holding mechanism 4 acts on the door body 2.

[0032] The first holding mechanism 4 may hold the door body 2 by holding the counterweight 3. That is, the first holding mechanism 4 may indirectly hold the door body 2 by holding the counterweight 3. If the counterweight 3 is located outside the casing 1, the first holding mechanism 4 is also located outside the casing 1.

[0033] The first retaining mechanism 4 includes a first member 41 attached to the casing 1 and a second member 42 attached to the door body 2 or counterweight 3 and releasably engaged with the first member 41. The first retaining mechanism 4 holds the door body 2 by the engagement of the first member 41 and the second member 42 with each other. Note that engagement is a concept that includes attraction.

[0034] The first holding mechanism 4 may hold the counterweight 3 by elastic force. For example, the second member 42 is a projection, and the first member 41 is a grip that elastically grasps the second member 42. The first holding mechanism 4 holds the door body 2 or the counterweight 3 by the elastic gripping of the second member 42 by the first member 41.

[0035] As shown in Figures 8 and 9, the first member 41 and the second member 42 are positioned such that when the door body 2 is in the upright position, the second member 42 is separated from the first member 41, and when the door body 2 is in the downed position, the second member 42 fits into the first member 41. The first member 41 is positioned so as not to interfere with the counterweight 3 when the door body 2 rotates between the upright and downed positions.

[0036] In the collapsed state of the door body 2, the door body 2 is held by the first holding mechanism 4 by the elastic force with which the first member 41 grips the second member 42. When a moment exceeding the elastic force of the first member 41 acts on the door body 2, the holding mechanism 4 releases its grip on the door body 2, and the door body 2 begins to transition to the upright state.

[0037] As shown in Figure 2, the second holding mechanism 5 holds the door body 2 in the upright position. In the upright position, the door body 2 contacts the door stop 15 and closes the opening 15a. In other words, the second holding mechanism 5 maintains the state in which the door body 2 closes the opening 15a.

[0038] The second holding mechanism 5 may hold the door body 2 by holding the counterweight 3. Since the counterweight 3 is integrally connected to the door body 2, when the counterweight 3 is held, the door body 2 is also held. In other words, the second holding mechanism 5 indirectly holds the door body 2 by holding the counterweight 3. If the counterweight 3 is located outside the casing 1, the second holding mechanism 5 is also located outside the casing 1.

[0039] The second holding mechanism 5 includes a first member 51 attached to the casing 1 and a second member 52 attached to the door body 2 or counterweight 3 and releasably engaged with the first member 51. The second holding mechanism 5 holds the door body 2 by the engagement of the first member 51 and the second member 52 with each other. Note that engagement is a concept that includes attraction.

[0040] The second holding mechanism 5 may hold the door body 2 in an upright position so that the door body 2 can be displaced around the rotation axis X. For example, at least one of the first member 51 and the second member 52 is configured to be displaceable in the circumferential direction of the rotation axis X. At least one of the first member 51 and the second member 52 may be configured to be elastically displaceable in the circumferential direction of the rotation axis X. For example, the first member 51 is attached to the casing 1 via an elastic member such as a spring or rubber. The first member 51 is elastically displaceable in the circumferential direction of the rotation axis X by the elastic member. As a result, the door body 2 held by the second holding mechanism 5 becomes displaceable around the rotation axis X. The second member 52 may be attached to the door body 2 or the counterweight 3 via an elastic member such as a spring or rubber, and may be elastically displaceable in the circumferential direction of the rotation axis X by the elastic member.

[0041] The second holding mechanism 5 may hold the door body 2 or the counterweight 3 by magnetic force. The second holding mechanism 5 attracts the door body 2 or the counterweight 3 by magnetic force. A moment is generated in the door body 2 or the counterweight 3 in a direction that pushes the door body 2 against the door stop 15. As a result, the door body 2 is pressed against the door stop 15 by the magnetic attraction. One of the first member 51 and the second member 52 may be a magnet, and the other of the first member 51 and the second member 52 may be a magnetic material. For example, the first member 51 may be a magnet and the second member 52 may be a magnetic material. If the door body 2 or the counterweight 3 contains a magnetic material, the door body 2 or the counterweight 3 may function as the second member 52.

[0042] In this example, the first member 51, which is a magnet, is attached to the casing 1. The counterweight 3 is made of a magnetic material and functions as the second member 52. The first member 51 is attached to the casing 1 via a support 53. As shown in Figures 8 and 9, the first member 51 is positioned away from the second member 52, i.e., the counterweight 3, when the door body 2 is in a down position, and in contact with or close to the counterweight 3 when the door body 2 is in an upright position. The first member 51 is positioned so as not to interfere with the counterweight 3 when the door body 2 is in a state other than a down position. The magnetic force of the first member 51 has almost no effect on the counterweight 3 when the door body 2 is in a down position, but acts on the counterweight 3 when the door body 2 is in an upright position. The first member 51 attracts the counterweight 3 by magnetic force when the door body 2 is in an upright position.

[0043] The support 53 may support the first member 51 so that it is displaceable in directions that move closer to and away from the counterweight 3 when the door body 2 is in an upright position. The support 53 may also support the first member 51 so that it is elastically displaceable in that direction. This allows the door body 2, held by the second holding mechanism 5, to be displaceable around the rotation axis X. For example, in addition to this, the impact when the counterweight 3 contacts the first member 51 is reduced.

[0044] The water-stopping device 100 may further include a damper 61 to mitigate the impact when the door body 2 contacts the door stop 15. The damper 61 slows down the rotation of the door body 2 around the rotation axis X. The damper 61 may also slow down the rotation of the door body 2 by slowing down the rotation of the counterweight 3 around the rotation axis X. If the counterweight 3 is located outside the casing 1, the damper 61 is also located outside the casing 1.

[0045] One end of the damper 61 is rotatably attached to the casing 1, and the other end of the damper 61 is rotatably attached to the counterweight 3. As the counterweight 3 rotates around the rotation axis X, the rod of the damper 61 extends and retracts. The damper 61 slows down the rotation of the door body 2 by slowing down the rotation of the counterweight 3.

[0046] The water-stopping device 100 may include multiple sets of counterweights 3 and second retaining mechanisms 5. For example, the water-stopping device 100 may include two sets of counterweights 3 and second retaining mechanisms 5. As shown in Figures 4 and 6, the shaft 23 extends through the first side wall 13 and the second side wall 14 of the casing 1 to the outside of the casing 1. One set of counterweights 3 and second retaining mechanisms 5 is positioned outside the first side wall 13. The other set of counterweights 3 and second retaining mechanisms 5 is positioned outside the second side wall 14. Counterweights 3 are attached to each of the ends of the shaft 23, which are located outside the casing 1.

[0047] The water-stopping device 100 may include a plurality of first retaining mechanisms 4. The water-stopping device 100 may also include a plurality of dampers 61. For example, in a configuration in which counterweights 3 are placed on the outside of the first side wall 13 and the second side wall 14, one set of first retaining mechanisms 4 and dampers 61 are placed on the outside of the first side wall 13, and another set of first retaining mechanisms 4 and dampers 61 are placed on the outside of the second side wall 14. The first retaining mechanisms 4 and dampers 61 are arranged to correspond to each of the plurality of counterweights 3.

[0048] Next, we will explain the operation of the water shutoff device 100.

[0049] Normally, the door body 2 is in a collapsed state. As shown in Figure 5, the door body 2 rests on the spacer 17. A space is formed between the door body 2 and the lower surface 12a of the casing 1. When the door body 2 is in the collapsed state, the opening 15a is open, and the flow path 10 is open. Air flows through the flow path 10. As shown in Figure 8, the door body 2 is held by the first holding mechanism 4. Specifically, the counterweight 3 is held by the first holding mechanism 4.

[0050] In this state, when water enters the casing 1 from the upstream side, the water enters the upstream space 10a of the casing 1. The water entering the upstream space 10a is blocked by the part of the door stop 15 that is below the opening 15a. As a result, water first accumulates in the lower part of the upstream space 10a. The space formed by the spacer 17 between the door body 2 and the lower surface 12a of the casing 1 is filled with water. The door body 2 receives buoyancy from the water accumulated in the lower part of the upstream space 10a.

[0051] When the buoyancy increases, the first holding mechanism 4 releases its grip on the door body 2. Once the first holding mechanism 4 releases its grip, the door body 2 begins to stand up from its downed position due to the buoyancy and the moment generated by the counterweight 3. Once the door body 2 begins to stand up, it rotates due to the moment generated by the counterweight 3 until it contacts the door stop 15. At this time, the rotational speed of the door body 2 is reduced by the damper 61.

[0052] The transition of the door body 2 to the upright position is completed when the door body 2 comes into contact with the door stopper 15. In the upright position, as shown in Figure 7, the door body 2 closes the opening 15a by coming into contact with the door stopper 15. This closes the flow path 10. At this time, the contact surface 24 of the door body 2 comes into contact with the watertight rubber 15b of the door stopper 15, thereby sealing the opening 15a watertight. By sealing the opening 15a, the door body 2 prevents water from entering the downstream side of the casing 1. For example, the rotation angle of the door body 2 around the rotation axis X between the collapsed position and the upright position is approximately 90 degrees.

[0053] When the door body 2 is in the upright position, it is held in that position by the second holding mechanism 5, as shown in Figure 9. Specifically, the counterweight 3 is held by the second holding mechanism 5. This increases the pressing force of the door body 2 against the door stop 15. As a result, the door body 2 firmly closes the opening 15a.

[0054] The door body 2 is pressed against the door stop 15 by the water pressure of the water entering the upstream space 10a. Therefore, when the amount of water entering the upstream space 10a is large, i.e., when the water depth is high, the pressing force of the door body 2 against the door stop 15 is sufficiently large. When the amount of water entering the upstream space 10a is small, i.e., when the water depth is low, the pressing force of the door body 2 due to water pressure is also small. However, since the door body 2 in the upright position is held by the second holding mechanism 5, the upright position of the door body 2, i.e., the state in which the door body 2 is pressed against the door stop 15, is maintained. Furthermore, when the door body 2 is held by the second holding mechanism 5, the first member 51 attracts the second member 52, generating a moment in the door body 2 that pushes it against the door stop 15. The door body 2 is pressed against the door stop 15 by the magnetic force of the first member 51. This ensures that the pressing force of the door body 2 against the door stop 15 is maintained.

[0055] In addition, the second holding mechanism 5 holds the door body 2 in an upright position so that it can be displaced around the rotation axis X. Therefore, when the water pressure from the water in the upstream space 10a to the door body 2 is large, the door body 2 displaces around the rotation axis X, further compressing the watertight rubber 15b. This improves the watertightness between the door body 2 and the door stop 15.

[0056] Figure 10 is a schematic diagram illustrating an example of the arrangement of the center of gravity G of the door body 2 and counterweight 3 in the upright position of the door body 2. Figure 11 is a schematic diagram illustrating an example of the arrangement of the center of gravity G of the door body 2 and counterweight 3 in the downed position of the door body 2. For example, in the upright position of the door body 2, the pressing force of the door body 2 against the door stop 15 can also be increased by the moment of the counterweight 3. For example, as shown in Figure 10, if the overall center of gravity G of the door body 2 and counterweight 3 in the upright position of the door body 2 is located in the region opposite to the door body 2 with respect to a reference line R that extends vertically perpendicular to the axis of rotation X, the moment of the counterweight 3 acts in a direction that presses the door body 2 against the door stop 15. The larger the eccentricity e2 of the center of gravity G in the horizontal direction, the larger the component of gravity acting on the center of gravity G that functions as a moment.

[0057] However, as shown in Figure 11, the eccentricity of the center of gravity G in the horizontal direction when the door body 2 is upright becomes an eccentricity of the center of gravity G in the approximately vertical direction when the door body 2 is collapsed. That is, the eccentricity amount e2 becomes the eccentricity of the center of gravity G in the approximately vertical direction when the door body 2 is collapsed. The center of gravity G, which is approximately vertically eccentric when the door body 2 is collapsed, generates a moment that rotates the door body 2 back to the upright position when it vibrates approximately horizontally. For example, when an earthquake occurs, the water-stopping device 100 vibrates, and the collapsed door body 2 also vibrates. If the eccentricity of the center of gravity G in the approximately vertical direction is large, the moment generated in the door body 2 and the counterweight 3 due to the approximately horizontal vibration of the door body 2 will be large. If a large moment is generated, there is a risk that the door body 2 will start to rotate from the collapsed position back to the upright position. Even when the door body 2 is in a collapsed state and is being held by the first holding mechanism 4, there is a risk that the holding by the first holding mechanism 4 may be released. As a result, there is a risk that the door body 2 will close the flow path 10 even though no water has entered the casing 1.

[0058] However, by holding the door body 2 in the upright position with the second holding mechanism 5, the second holding mechanism 5 can ensure that the door body 2 is pressed against the door stop 15 by the moment of the counterweight 3. In other words, by employing the second holding mechanism 5, the center of gravity G can be positioned at a location where the eccentricity e2 of the center of gravity G in the approximately horizontal direction is small when the door body 2 is in the upright position. For example, when the door body 2 is in the collapsed position, the eccentricity e2 of the center of gravity G in the approximately vertical direction from the rotation axis X is smaller than the eccentricity e1 of the center of gravity G in the approximately horizontal direction from the rotation axis X. As a result, the eccentricity e2 of the center of gravity G in the approximately vertical direction when the door body 2 is in the collapsed position can be reduced, and the moment caused by vibration in the approximately horizontal direction of the collapsed door body 2 can be reduced. This prevents unnecessary closure of the flow path 10.

[0059] In the collapsed state of the door body 2, the eccentricity e2 of the center of gravity G in the vertical direction from the rotation axis X may be zero, as shown in Figure 8. That is, in the collapsed state of the door body 2, the center of gravity G is located directly below the rotation axis X. This makes it possible to sufficiently reduce the moment caused by vibration in the approximately horizontal direction of the collapsed door body 2.

[0060] As described above, the water-stopping device 100 can maintain the upright position of the door body 2 by holding it in the upright position with the second holding mechanism 5. Therefore, the center of gravity G can be positioned at a location where the eccentricity e2 of the center of gravity G in the vertical direction from the rotation axis X is small when the door body 2 is in the collapsed position. By reducing the eccentricity e2 of the center of gravity G, the door body 2 can be stably maintained in the collapsed position. As a result, the door body 2 can prevent the door body 2 from unnecessarily blocking the flow path 10, while appropriately closing the flow path 10 when water enters.

[0061] In addition, by placing the counterweight 3 and the second holding mechanism 5 outside the casing 1, and having the second holding mechanism 5 hold the counterweight 3, the internal structure of the casing 1 can be simplified. If the door body 2 is to be directly held by the second holding mechanism 5, the second holding mechanism 5 will be placed inside the casing 1. Inside the casing 1, it is necessary to secure space for the door body 2 to move and for the flow path 10. By placing the counterweight 3 and the second holding mechanism 5 outside the casing 1, the number of parts inside the casing 1 can be reduced, making it easier to secure space. Furthermore, by placing the counterweight 3 and the second holding mechanism 5 outside the casing 1, the assembly and maintenance of the counterweight 3 and the second holding mechanism 5 become easier.

[0062] The second holding mechanism 5 holds the door body 2 in the upright position using magnetic force, making it easy to change the holding force of the second holding mechanism 5. For example, the holding force of the second holding mechanism 5 can be changed by changing the first member 51 of the second holding mechanism 5.

[0063] Furthermore, the second holding mechanism 5 holds the door body 2 in an upright position so that it can be displaced around the rotation axis X, thereby allowing the door body 2 to be displaced in a direction that presses it against the door stop 15. For example, when the amount of water upstream of the door body 2 increases and the water pressure on the door body 2 increases, the door body 2 is allowed to be displaced in a direction that brings it closer to the door stop 15. This allows the door body 2 to compress the watertight rubber 15b more, improving the watertightness between the door body 2 and the door stop 15.

[0064] Other embodiments As described above, the embodiments described herein have been presented as examples of the technology disclosed in this application. However, the technology in this disclosure is not limited thereto and can be applied to embodiments that have been modified, replaced, added, or omitted as appropriate. Furthermore, it is possible to combine the components described in the embodiments above to create new embodiments. In addition, the components described in the attached drawings and detailed description may include not only components essential for solving the problem, but also components that are not essential for solving the problem, in order to illustrate the technology. Therefore, the mere presence of such non-essential components in the attached drawings and detailed description should not be immediately assumed to mean that those non-essential components are essential.

[0065] For example, the water-stopping device 100 may be directly attached to a wall in a building where an opening such as a ventilation opening is formed.

[0066] The cross-sectional shape of the casing 1, the outer shape of the door stopper 15, the shape of the opening 15a, and the shape of the door body 2 are not limited to a rectangle. For example, the cross-sectional shape of the casing 1 may be circular or oval. The shape of the opening 15a may be circular or oval.

[0067] The door stopper 15 may be located at the upstream or downstream end of the casing 1. When the door stopper 15 is located at the upstream end of the casing 1, the door body 2 is located outside the casing 1. In this case, the internal space of the casing 1 does not have an upstream space 10a, but only a downstream space 10b. For example, the door body 2 is located in a flow channel connected to the upstream end of the casing 1. The door body 2, in a collapsed state, stands upright due to the buoyancy of water entering the flow channel. When the door stopper 15 is located at the downstream end of the casing 1, the door body 2 is located inside the casing 1. In this case, the internal space of the casing 1 does not have a downstream space 10b, but only an upstream space 10a. The opening 15a constitutes the opening at the downstream end of the casing 1, i.e., the outlet.

[0068] The watertight rubber may be attached to the door body 2 instead of the door stopper 15. Alternatively, in addition to the watertight rubber 15b of the door stopper 15, watertight rubber may also be attached to the door body 2.

[0069] In the collapsed state of the door body 2, the eccentricity e2 of the center of gravity G in the vertical direction from the rotation axis X does not have to be zero. However, from the viewpoint of stably maintaining the collapsed state of the door body 2, it is preferable that the eccentricity e2 of the center of gravity G is small.

[0070] The counterweight 3 may be placed inside the casing 1.

[0071] The second retaining mechanism 5 may be located inside the casing 1. In that case, the second retaining mechanism 5 may directly hold the door body 2 instead of the counterweight 3. The number of second retaining mechanisms 5 is not limited to two; there may be one or three or more. The number of second retaining mechanisms 5 does not have to be the same as the number of counterweights 3, first retaining mechanisms 4, or dampers 61.

[0072] The first retaining mechanism 4 may be located inside the casing 1. In that case, the first retaining mechanism 4 may directly hold the door body 2 instead of the counterweight 3. The number of first retaining mechanisms 4 is not limited to two; it may be one or three or more. The number of first retaining mechanisms 4 does not have to be the same as the number of counterweights 3, second retaining mechanisms 5, or dampers 61.

[0073] Damper 61 may be omitted.

[0074] The first holding mechanism 4 is not limited to the configuration described above. For example, the first holding mechanism 4 may hold the door body 2 or the counterweight 3 by magnetic force, as in the second holding mechanism 5. For example, one of the first member 41 and the second member 42 may be a magnet, and the other of the first member 41 and the second member 42 may be a magnetic material.

[0075] The second holding mechanism 5 is not limited to the configuration described above. For example, the first member 51 may be a magnetic material, and the second member 52 may be a magnet. For example, the first member 51, which is a magnetic material, is attached to the casing 1 via a support 53. The second member 52, which is a magnet, is attached to the counterweight 3.

[0076] For example, the second holding mechanism 5 may hold the door body 2 by elastic force. Figure 12 is a side view of the water-stopping device 100 in the upright position of the door body 2, according to a modified example. The second holding mechanism 205 may include a hook 251 and a hook receiver 252 with which the hook 251 engages. One of the hook 251 and the hook receiver 252 is a first member attached to the casing 1, and the other of the hook 251 and the hook receiver 252 is a second member attached to the door body 2 or the counterweight 3 and releasably engaged with the first member. That is, one of the hook 251 and the hook receiver 252 is attached to the counterweight 3. For example, the hook receiver 252 may be attached to the counterweight 3. The hook 251 may be attached to the casing 1.

[0077] For example, the hook receiver 252 is a pin that engages with the hook 251. The hook receiver 252 is fixed to the counterweight 3. The hook receiver 252 rotates integrally with the counterweight 3 around the axis of rotation X.

[0078] The hook 251 engages with the hook receiver 252 when the door body 2 is in an upright position. For example, the hook 251 is supported by the casing 1 so as to be rotatable around the axis of rotation Y. The hook 251 is supported so as to be elastically rotatable around the axis of rotation Y. The hook 251 rotates around the axis of rotation Y between an engaged position in which it engages with the hook receiver 252 and a disengaged position in which it disengages from the hook receiver 252.

[0079] The second retaining mechanism 205 may have a spring 253 that imparts elastic force to the hook 251. The spring 253 is attached to the casing 1 and the hook 251, respectively. The hook 251 is normally in the engaged position. The hook 251 rotates from the engaged position to the released position against the elastic force of the spring 253. In the released position, the hook 251 is biased towards the engaged position by the elastic force of the spring 253.

[0080] For example, the hook 251 has a first end and a second end. The portion of the hook 251 between the first end and the second end is supported so as to be rotatable around the rotation axis Y. The first end of the hook 251 is provided with a projection 251a that engages with the hook receiver 252. The projection 251a is positioned on the trajectory of the hook receiver 252 when the door body 2 rotates around the rotation axis X. When the door body 2 transitions from a reclined state to an upright state, the hook receiver 252 contacts the projection 251a, causing the hook 251 to rotate from the engaged position to the released position. The spring 253 is compressed and deformed by the rotation of the hook 251 to the released position. When the transition of the door body 2 to the upright state is complete, the hook receiver 252 overcomes the projection 251a. As a result, the hook 251 rotates from the released position to the engaged position by the elastic force of the spring 253. The hook 251 engages with the hook receiver 252 by rotating to the engaged position. The second holding mechanism 205 holds the door body 2 in an upright position when the hook 251 engages with the hook receiver 252. Even if a moment acts on the door body 2 in a direction that causes it to collapse, the hook 251 restricts the movement of the hook receiver 252, and the upright position of the door body 2 is maintained.

[0081] In addition, when the hook 251 is engaged with the hook receiver 252, the spring 253 presses the hook 251 against the hook receiver 252 by its elastic force. The pressing force of the hook 251 against the hook receiver 252 generates a moment in the door body 2 that pushes it against the door stopper 15. In other words, when the second holding mechanism 205 holds the door body 2 in the upright position, the door body 2 is pressed against the door stopper 15 by the elastic force of the spring 253.

[0082] Furthermore, the hook 251 may be attached to the counterweight 3 and the hook receiver 252 may be attached to the casing 1. Alternatively, the hook 251 may be fixed to either the casing 1 or the counterweight 3, and the hook receiver 252 may be elastically displaceable on the other of the casing 1 or the counterweight 3 via a spring 253. In this case, as the door body 2 transitions to the upright position, the hook 251 displaces the hook receiver 252 against the elastic force of the spring 253. When the transition of the door body 2 to the upright position is complete, the hook receiver 252 is displaced by the elastic force of the spring 253 and engages with the hook 251. Even with such a configuration, the second holding mechanism 205 can hold the door body 2 in the upright position.

[0083] Furthermore, the configuration of the second holding mechanism 205 may also be applied to the first holding mechanism 4.

[0084] [Pattern] The above embodiment is a specific example of the following embodiment.

[0085] (Aspect 1) The water-stopping device 100 comprises a cylindrical casing 1 that partitions the flow path 10, a door body 2 that rotates around a rotation axis X to transition between a downed state that opens the flow path 10 and an upright state that closes the flow path 10, thereby opening and closing the flow path 10, a counterweight 3 connected to the door body 2, and a second holding mechanism 5 that holds the door body 2 in the upright state.

[0086] In this configuration, the flow path 10 opens when the door body 2 is in a collapsed state. The flow path 10 closes when the door body 2 rotates around the rotation axis X from the collapsed state to an upright state. The counterweight 3 promotes the rotation of the door body 2 from the collapsed state to the upright state. The upright state of the door body 2, i.e., the closure of the flow path 10, is properly maintained by the second holding mechanism 5 holding the upright state of the door body 2. Since the upright state of the door body 2 is maintained by the second holding mechanism 5, the moment due to the counterweight 3 required to maintain the upright state of the door body 2 can be reduced. In other words, the eccentricity e2 of the center of gravity G in the approximately horizontal direction from the rotation axis X when the door body 2 is in the upright state can be reduced. This eccentricity e2 is the eccentricity of the center of gravity G in the approximately vertical direction from the rotation axis X when the door body 2 is in a collapsed state. As a result, the moment caused by vibration in the approximately horizontal direction of the door body 2 in the collapsed state can be reduced. This allows the door body 2 to be stably maintained in a tilted state, preventing unnecessary closure of the flow path 10.

[0087] (Aspect 2) In the water-stopping device 100 described in Aspect 1, the counterweight 3 is located outside the casing 1, and the second holding mechanism 5 is located outside the casing 1 and holds the door body 2 by holding the counterweight 3.

[0088] In this configuration, the counterweight 3 is integrally connected to the door body 2, so the second holding mechanism 5 can hold the door body 2 by holding the counterweight 3. By arranging the counterweight 3 and the second holding mechanism 5 outside the casing 1, the number of parts inside the casing 1 is reduced, making it easier to secure the movable space of the door body 2 and the flow path 10.

[0089] (Aspect 3) In the water-stopping device 100 described in Aspect 1 or Aspect 2, the second holding mechanism 5 holds the counterweight 3 by magnetic force.

[0090] This configuration facilitates holding by the second holding mechanism 5. Furthermore, if the counterweight 3 is made of a magnetic material, there is no need to provide a separate magnetic material to be attracted to the magnet, thus simplifying the configuration of the second holding mechanism 5. Additionally, since the magnetic force can be easily changed, the holding force of the second holding mechanism 5 can be easily modified.

[0091] (Aspect 4) In the water-stopping device 100 described in any one of aspects 1 to 3, the second holding mechanism 205 includes a hook 251 and a hook receiver 252 into which the hook 251 engages, and one of the hook 251 and the hook receiver 252 is attached to the counterweight 3.

[0092] In this configuration, the door body 2 is held in an upright position by the hook 251 and the hook receiver 252. In other words, the counterweight 3 is held when the hook 251 engages with the hook receiver 252, and as a result, the door body 2 is held in place.

[0093] (Aspect 5) In the water-stopping device 100 described in any one of aspects 1 to 4, the overall center of gravity G of the door body 2 and the counterweight 3 is located at an eccentric position from the rotation axis X and is positioned to generate a moment in the door body 2 from the collapsed state to the upright state, and in the collapsed state of the door body 2, the amount of eccentricity e2 of the center of gravity G in the substantially vertical direction from the rotation axis X is smaller than the amount of eccentricity e1 of the center of gravity G in the substantially horizontal direction from the rotation axis X.

[0094] This configuration reduces the moment caused by the approximately horizontal vibration of the door body 2 in the collapsed state. This prevents the unnecessary closure of the flow path 10. On the other hand, by making the eccentricity e1 of the center of gravity G approximately horizontally from the rotation axis X in the collapsed state of the door body 2 relatively large, a moment that promotes the door body 2 from standing upright can be secured.

[0095] (Aspect 6) In the water-stopping device 100 described in any one of aspects 1 to 5, when the door body 2 is in the collapsed state, the eccentricity e2 of the center of gravity G in the substantially vertical direction from the rotation axis X is zero.

[0096] This configuration allows for a sufficiently small moment to be generated from the approximately horizontal vibration of the door body 2 in the collapsed state. [Explanation of Symbols]

[0097] 100 Water shutoff device 1 Casing 2 Door Body 3 Counterweights 4 First holding mechanism 5,205 Second retention mechanism 251 Hook 252 Hook receiver e1 Eccentricity e2 Eccentricity G center of gravity

Claims

1. A cylindrical casing that partitions the flow path, A door body that rotates around a rotation axis, transitioning between a downed state that opens the flow path and an upright state that closes the flow path, thereby opening and closing the flow path, A counterweight connected to the door body generates a moment to rotate the door body from the collapsed state to the upright state, A first holding mechanism that holds the door body in the lowered state, A water-stopping device comprising a second holding mechanism for holding the door body in the upright position.

2. In the water-stopping device according to claim 1, The counterweight is located outside the casing. The second holding mechanism is a water-stopping device that is located outside the casing and holds the door body by holding the counterweight.

3. In the water-stopping device according to claim 2, The second holding mechanism is a water-stopping device that holds the counterweight by magnetic force.

4. In the water-stopping device according to claim 1, The second retaining mechanism includes a hook and a hook receiver with which the hook engages. The hook and the hook receiver are water-stopping devices attached to the counterweight.

5. In the water-stopping device according to claim 1, The overall center of gravity of the door body and the counterweight is located at a position eccentric to the axis of rotation and is positioned to generate a moment in the door body from the collapsed state to the upright state. A water-stopping device in which, in the tilted state of the door body, the amount of eccentricity of the center of gravity in the vertical direction from the rotation axis is smaller than the amount of eccentricity of the center of gravity in the horizontal direction from the rotation axis.

6. In the water-stopping device according to claim 5, A water-stopping device in which, when the door body is in the collapsed state, the amount of eccentricity of the center of gravity in the vertical direction from the axis of rotation is zero.

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