JP2006008147A - Sloshing suppressing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus which is capable of effectively suppressing sloshing in a large-sized liquid storing tank, and is also applicable to an existing storing tank. <P>SOLUTION: A flow resistance giving member 11 is held below the liquid face near a wall body in the liquid storing tank with a cylindrical wall body 1. The flow resistance giving member has a net-like body 11b approximately horizontally held, to which an ascending force is given by a floating body 12, and which is moored at a base plate 13 by a restraining member 14 consisting of a wire and is held at a specified depth. A resistance is given thereby to a liquid flow in the vertical direction when the sloshing is generated. The flow resistance giving member may be a perforated panel, a plurality of rod-like members, a lattice-like member or the like. A link mechanism provided with a viscous resistance by a damper can be used instead of the wire or with the wire. In addition, it is possible to constitute the flow resistance giving member so that the height for holding the flow resistance giving member is changed accompanied with changing an amount of storing of the liquid. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an apparatus that suppresses a so-called sloshing phenomenon in which a liquid surface fluctuates when a horizontal force such as an earthquake acts in a large cylindrical storage tank that stores liquid such as water or petroleum.

  Cylindrical storage tanks are widely used as containers for storing petroleum such as crude oil and heavy oil. When an earthquake occurs in a state where liquid is stored in such a storage tank, as shown in FIG. 13, the liquid level fluctuates due to horizontal ground motion, and the liquid level rises and closes near the cylindrical wall. The descending is repeated. The natural period of the liquid level fluctuation in a large storage tank is generally a long period. However, when the earthquake motion includes a long period component, the fluctuation of the liquid level grows and the liquid level rises and falls. And in the storage tank from which the upper part of the wall body was open | released, if the raised liquid level becomes higher than the top part of a wall body, the liquid to store will overflow in large quantities outside a storage tank. Moreover, when a storage tank has a floating roof on a liquid level, a floating roof will be lifted largely with a raise of a liquid level, and there exists a possibility that a roof may be destroyed. In such a situation, the stored liquid leaks onto the floating roof, and there is a risk that a fire may occur in the case of combustible liquids such as petroleum.

As means for suppressing the sloshing phenomenon, there are those disclosed in Patent Document 1 and Patent Document 2.
The technique described in Patent Document 1 provides a spiral guide fin along the inner peripheral surface of a wall of a cylindrical storage tank. The induction fin is a plate-like member that extends substantially horizontally from the wall to the inside of the storage tank and continues in a spiral shape. As a result, the liquid movement in the vertical direction generated in the vicinity of the wall at the time of sloshing is changed to an upward flow or a downward flow that spirally swirls, and a resistance is given to the flow of the liquid by the wall or the guide fin to reduce energy. Is.

The technique described in Patent Document 2 supports a vibration damping member supported from a dome roof in the vicinity of the liquid level in the storage tank. The damping member is an annular member that is supported in a horizontal state near the inner peripheral surface of the wall body, and can be adjusted in the vertical direction according to the liquid level. Then, the vibration damping member is moved based on the position information detected by the liquid level detection means, and is held in a state of contacting the free liquid level of the stored liquid.
JP-A-56-106773 Japanese Utility Model Publication No. 6-6297

However, the above known technique has the following problems.
In the technique described in Patent Document 1, in order to effectively suppress sloshing, it is necessary to project the induction fin from the wall body with a large width. Particularly in a cylindrical storage tank having a large inner diameter, sloshing can hardly be suppressed if the width of the induction fin is small. When the width of the induction fin is increased, the member needs to be large and strong, and the construction cost is greatly increased. In addition, it is difficult to add such induction fins to an existing storage tank.

  Moreover, in the technique described in Patent Document 2, the damping member is supported from the dome roof, and the roof structure must be made strong in order to resist the vertical force acting from the fluctuating liquid level. . This technique cannot be applied to a storage tank having a floating roof.

  The present invention has been made in view of the above-described problems, and the object thereof is to effectively suppress sloshing in the storage tank with a simple structure and to be applicable to an existing storage tank. It is to provide a sloshing suppression device.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a liquid which is held below the liquid surface in the vicinity of the wall body in the liquid storage tank having a cylindrical wall body and moves upward in the vicinity of the wall body. A fluid resistance imparting member that imparts resistance to the fluid, a floating body that floats the fluid resistance imparting member in the liquid, one end connected to the fluid resistance imparting member or the float, and the other end to the wall body and bottom plate of the liquid storage tank Or a constraining member connected to a base plate provided on the bottom plate, maintaining the flow resistance imparting member at a predetermined depth below the liquid level, and allowing the flow resistance imparting member to descend when the liquid level decreases. There is provided a sloshing suppression device.

  In this apparatus, the flow resistance applying member is applied with a force in the direction of rising by the floating body, and is restrained from rising from a predetermined height by the restraining member. Therefore, the flow resistance imparting member is supported at a predetermined depth below the liquid level in the storage tank. In addition, when the amount of liquid stored in the storage tank decreases and the liquid level decreases, the flow resistance imparting member also descends as the floating body descends, and even if there is a floating roof on the liquid surface, this floating roof There is no hindrance to the descent.

  When sloshing occurs in the storage tank, as shown in FIG. 13, the liquid flows in the horizontal direction near the liquid level in the central part of the storage tank, and near the wall body where the liquid level is rising, Ascending current along. Further, in the portion where the liquid level is descending, a downward flow is generated near the wall surface. And the flow resistance provision member is supported so that it may cross with the upward flow produced near a wall body, and resistance is provided to the flow of a liquid. Thereby, the kinetic energy of the liquid is attenuated and sloshing is suppressed. In the part where the liquid level is lowered, if the restraining member is a wire or chain member that is flexibly deformed, the flow resistance imparting member also descends as the liquid flows downward, giving resistance to the liquid flow However, the restraint member is equipped with a mechanism that restricts the movement of the flow resistance imparting member when the fluctuation speed of the liquid level is large, such as when sloshing occurs, so that the liquid flows even when the liquid level drops. It is possible to impart resistance to the slosh and to efficiently attenuate sloshing.

  When a wire or chain member that deforms flexibly is used as the restraining member, when the liquid level is lowered due to a decrease in the amount of stored liquid, the flow resistance imparting member is lowered together with the floating body, and the restraining member is loosened. In this state, unless the flow resistance imparting member rises to a height at which tension is generated in the restraining member, resistance cannot be imparted to the flowing liquid, and it is desirable to provide means for eliminating the loosening of the restraining member. However, when the liquid level is lowered, sloshing hardly grows, and there is little possibility that the liquid overflows beyond the wall. Therefore, even if the constraining member is loosened when the amount of stored liquid is decreasing, the effect of preventing the liquid from overflowing due to sloshing is achieved.

  The invention according to claim 2 is the sloshing suppression device according to claim 1, wherein the flow resistance imparting member is a net-like member, a perforated plate, a plurality of rod-like members arranged at intervals, a lattice-like member, a divided member It shall have one or a plurality of members selected from a plurality of made flat plates.

  In this apparatus, the flow of liquid generated in the vertical direction by sloshing intersects with the flow resistance imparting member, and the mesh of the mesh member, the hole of the perforated plate, the rod-like member, the lattice of the lattice-like member, a plurality of plate-like members It passes between the members. At this time, the liquid flow is disturbed and becomes a resistance to the liquid flow. Then, by adjusting the size of the mesh of the mesh member and the thickness of the wire constituting the mesh, the size and the interval of the holes of the perforated plate, the size of the resistance applied to the fluid movement can be adjusted. it can. Moreover, the magnitude | size of resistance can be adjusted similarly by adjusting the member interval of a rod-shaped member, a grid | lattice-shaped member, a plate-shaped member, the thickness or magnitude | size of a member, etc. Thus, by adjusting the magnitude of the resistance imparted to the movement of the fluid, it is possible to appropriately set the sloshing damping efficiency of the fluid and the structural strength necessary for the flow resistance imparting member. Sloshing can be efficiently suppressed according to the type of liquid.

  The invention according to claim 3 is the sloshing suppression device according to claim 1, wherein the position of the flow resistance imparting member held by the restraining member is adjusted according to the amount of liquid stored in the storage tank. It shall have means.

  The amount of liquid stored in the storage tank is not always constant, and liquid is injected and discharged through a pipe line. Thus, when the amount of storage changes and the liquid level fluctuates, the sloshing state also changes, and the range in which the liquid flows changes. In the sloshing suppression device according to the present invention, the position adjusting means adjusts the position in the height direction of the flow resistance imparting member in response to the change in the liquid level, and is appropriate according to the height of the liquid level. The flow resistance imparting member is held at a proper position, and sloshing is effectively suppressed.

  The invention according to claim 4 is the sloshing suppression device according to claim 3, wherein the restraining member is a wire or a chain member that is flexibly deformed, and the position adjusting means winds one end of the restraining member or The take-up device includes a take-up device that can be pulled out, and the take-up device winds up or pulls out the restraining member in response to a change in the liquid level due to a change in the amount of stored liquid, and changes the liquid level over a predetermined speed. When this occurs, the winding and withdrawal of the restraining member shall be locked.

  In this sloshing suppression device, the flow resistance imparting member is given a force to lift upward by the floating body, and is restrained by the tensile force of the restraining member and held at a predetermined position. And when the liquid level in a storage tank changes slowly, for example, when a liquid level falls by discharging | emitting a liquid from a storage tank, a flow resistance provision member can be lowered | hung by winding up a restraint member. Thereby, even when the liquid level is at a slightly lowered position, the flow resistance imparting member can be moved to an appropriate position to effectively suppress the sloshing of the stored liquid. Further, when the liquid level slowly rises due to the liquid being injected into the storage tank, the restraining member can be pulled out and the flow resistance applying member can be raised and held at an appropriate position.

  When sloshing occurs, the liquid level rises and falls at a speed much higher than the rising or falling speed of the liquid level when the amount of stored liquid changes. Therefore, when the liquid level fluctuates at such a high speed, the winding device for the restraining member is locked, and the vertical position of the flow resistance applying member is restrained so that the restraining member is not wound and pulled out. To do. As a result, the flow resistance imparting member interferes with the liquid flow in the vertical direction associated with the sloshing, and imparts resistance to liquid movement.

  The mechanism that locks the winding device may be locked by a signal from a sensor that detects the position of the liquid level, or may be locked by detecting the winding or pulling speed of the restraining member. Good. Further, it may be controlled by an electric signal from a sensor that detects the speed, or may be provided with a mechanism that is mechanically interlocked with the operation of the restraining member or the like.

  The invention according to claim 5 is the sloshing suppression device according to claim 3, wherein the floating body floats in a state where the flow resistance imparting member is suspended and supported by a wire or a chain member, It is a wire or a chain member that deforms flexibly, and the position adjusting means includes a winding device that can wind up or pull out one end of the restraining member, and the winding device is attached to the restraining member. The restraining member is pulled out when a tensile force of a predetermined value or more acts, and the restraining member is wound when the tensile force is smaller than the predetermined value or a second predetermined value smaller than the predetermined value. A damper that provides viscous resistance to the winding and drawing operation is provided.

  In this sloshing suppression device, the floating body floats in a state where the flow resistance imparting member is suspended and supported, so that a tensile force acts on the restraining member, and the restraining member is pulled out from the winding device by this tensile force. Can do. Then, when the floating body reaches the liquid level and no further levitation force acts, the withdrawal of the restraining member stops. At this time, the floating body floats on the liquid surface or is in contact with the floating roof that floats on the liquid surface. Can be held in any position. Therefore, even if the liquid storage amount in the storage tank increases and the liquid level rises, the flow resistance imparting member is held at an appropriate position. On the other hand, when the storage amount is reduced and the liquid level is lowered, the flow resistance imparting member integrated with the floating body is also lowered, so that the tensile force of the restraining member does not act and loosens. When the tensile force is thus reduced, the restraining member can be set to be wound by the winding device.

  When sloshing occurs, the fluctuation of the liquid level occurs at a higher speed than when the liquid storage amount changes, and when the floating body and the flow resistance imparting member try to rise at this speed, the damper acts and the restraint member Apply viscous resistance to the drawer. Therefore, the flow resistance imparting member is restrained from moving with respect to the flow of the liquid and imparts resistance to the upward flow of the liquid. When the amount of stored liquid changes, the liquid level fluctuates very slowly, so that the viscous resistance of the damper hardly restricts drawing and winding of the restricting member.

  The invention according to claim 6 is the sloshing suppression device according to claim 3, wherein the floating body floats in a state in which the flow resistance imparting member is suspended and supported by a wire or a chain member, It is a wire or a chain member that deforms flexibly, and the position adjusting means is a winding device that can wind up or pull out one end of the restraining member, and the winding device is not less than a predetermined value on the restraining member. The restraining member is pulled out when the tensile force acts, and the restraining member is wound up when the tensile force is smaller than the predetermined value or a second predetermined value smaller than the predetermined value. It is assumed that a lock mechanism is provided that stops the operation when the drawing speed becomes equal to or higher than a predetermined speed.

  In this sloshing suppression device, similarly to the device according to claim 5, even if the liquid level rises or falls due to fluctuations in the liquid storage amount, the flow resistance imparting member is suspended and supported from the floating body at an appropriate position below the liquid level. The When sloshing occurs, the winding and drawing of the restraining member are locked, and the flow resistance imparting member resists the movement of the liquid rising near the wall body, thereby dampening the sloshing.

  The invention according to claim 7 is the sloshing suppression device according to claim 1, wherein the plurality of rod-like elements are rotatably connected, and the flow resistance imparting member and the base plate provided on the bottom plate or the bottom plate are connected. A link mechanism is provided as the restraining member or together with the restraining member, and the link mechanism has a damper that imparts viscous resistance to its operation.

The link mechanism allows the flow resistance imparting member to descend by being deformed, and does not hinder the floating roof from descending when the liquid level is slowly lowered as the liquid storage amount varies. That is, the damper does not resist the lowering of the flow resistance imparting member.
Also, when sloshing occurs and the liquid level fluctuates at a relatively large speed, viscous resistance is applied to the deformation of the link mechanism to restrain the flow resistance applying member from rising and lowering, and the liquid only flows upward. In addition, resistance can be imparted to the downward flow. Therefore, sloshing can be attenuated efficiently.
Furthermore, by providing a stopper that restricts the link mechanism from extending beyond a predetermined position, this link mechanism can also be used as a restraining member. Can be maintained at a predetermined height.

  According to an eighth aspect of the present invention, there is provided a flow resistance imparting member for imparting resistance to a liquid that is held below a liquid surface in the vicinity of the wall body in a liquid storage tank having a cylindrical wall body and moves upward in the vicinity of the wall body. A floating body that floats the flow resistance imparting member in the liquid, a hanging member having one end connected to the flow resistance imparting member or the floating body, and a position fixed to the bottom of the liquid storage tank, and the upper portion of the wall body A wire or chain member that is hung on each of the hung members whose positions are fixed at the other end and connected to the upper surface of the floating roof whose other end floats on the liquid surface, and is intermediate between the wire or chain member A connecting member in which an elastic member that can be expanded and contracted is inserted in the part, and a damper that imparts a viscous resistance against movement in the axial direction of the connecting member to the connecting member closer to the flow resistance applying member than the elastic member, or To the axial direction of the connecting member When the movement is equal to or greater than a predetermined speed, the connecting member of the elastic member than the flow resistance applying member side there is provided an anti-sloshing device and a locking mechanism for restraining the movement in the axial direction.

  In this sloshing suppression device, the upward flow force acts on the flow resistance imparting member due to the buoyant force of the floating body, and the upward movement is restrained at a predetermined position by the tensile force of the connecting member. Retained. Then, since the connecting member is hung by the hanging member and connected to the floating roof, the liquid level slowly changes due to the fluctuation of the liquid storage amount, and when the floating roof moves upward or downward, the flow resistance is interlocked with this. The application member is also raised or lowered. Therefore, the flow resistance imparting member is held at an appropriate position below the liquid level even if the liquid level fluctuates.

  In addition, when sloshing occurs, the floating roof repeats ascending and descending as the liquid level fluctuates, but the flow resistance applying member has almost no position due to viscous resistance acting on the connecting member or locking of the connecting member. It does not fluctuate and gives resistance to the flow of liquid in the vertical direction. The connecting member coupled to the floating roof is pulled and relaxed by the rising and lowering of the floating roof repeatedly at a high speed, but is absorbed by the elastic member, and a large tensile force is transmitted to the flow resistance member side. Is avoided.

  According to a ninth aspect of the present invention, there is provided a flow resistance imparting resistance to a liquid which is held below the liquid surface in the vicinity of the wall body in the liquid storage tank having a cylindrical wall body and moves in the vertical direction near the wall body. A member, a plurality of rod-like elements rotatably connected, a link mechanism that connects the flow resistance applying member and a base plate or a base plate provided on the bottom plate, and imparts viscous resistance to the operation of the link mechanism A damper, a floating roof in the storage tank, and the flow resistance imparting member are connected, and the flow resistance imparting member is held at a predetermined depth below the liquid level even when the amount of stored liquid in the storage tank varies. There is provided a sloshing suppression device comprising: a connecting member; and a trigger device that releases the restraint by the connecting member between the floating roof and the flow resistance imparting member when sloshing occurs in the liquid in the storage tank.

  In this sloshing suppression device, the flow resistance imparting member is connected to and held by the floating roof, and the flow resistance imparting member and the bottom plate or the base plate provided on the bottom plate are connected by a link mechanism, When the amount of the stored liquid fluctuates and the floating roof slowly rises or falls, the flow resistance imparting member also rises or falls accordingly. That is, the link mechanism is not deformed and does not restrain the rise or fall of the flow resistance applying member. Further, the damper that gives the link mechanism viscous resistance does not resist because the fluctuation of the liquid level is slow.

  On the other hand, when sloshing occurs, the rise and fall of the liquid level due to the fluctuation of the liquid level occurs at a speed much higher than the fluctuation of the liquid level when the liquid storage amount fluctuates. When this is detected, the trigger device is activated and the restraint between the floating roof and the fluid resistance imparting member is released, so that the floating roof repeats rocking with the rocking of the liquid surface. The resistance applying member is constrained by a link mechanism on which viscous resistance acts, and its position varies only slightly. Therefore, the flow resistance imparting member crosses the upward flow and the downward flow of the liquid generated near the wall, and resistance is given to the movement of the liquid.

  The trigger device may include a sensor that detects a change in the liquid level, and when detecting the fluctuation speed of the liquid level, the trigger device may release the restraint of the connecting member based on the electric signal. It may be released when an earthquake motion is detected. Moreover, the thing of various mechanisms, such as what releases a restraint mechanically when a big tensile force or compressive force acts on a connection member, is employable.

  According to a tenth aspect of the present invention, there is provided a flow resistance imparting resistance to a liquid which is held below a liquid surface in the vicinity of the wall body in a liquid storage tank having a cylindrical wall body and moves in the vertical direction near the wall body. A member, a plurality of rod-like elements rotatably connected, a link mechanism that connects the flow resistance applying member and a base plate or a base plate provided on the bottom plate, and imparts viscous resistance to the operation of the link mechanism A damper, a floating roof in the storage tank, and the flow resistance imparting member are connected, and the flow resistance imparting member is held at a predetermined depth below the liquid level even when the amount of stored liquid in the storage tank varies. A connecting spring member, and the connecting spring member allows a gap between the floating roof and the flow resistance imparting member to vary when sloshing occurs in the liquid in the storage tank. Sloshing suppression device I will provide a.

  In this sloshing suppression device, the flow resistance imparting member is connected to the floating roof by a connecting spring member, and is held below the floating roof at a predetermined interval. The flow resistance imparting member and the bottom plate or the base plate provided on the bottom plate are connected by a link mechanism, but when the amount of stored liquid fluctuates and the floating roof slowly rises or falls, the link The mechanism is deformed accordingly, and the flow resistance imparting member is raised or lowered with the floating roof. That is, since the link mechanism is deformed slowly, viscous resistance does not act, and the flow resistance imparting member is not restrained from rising or falling. Therefore, the connecting spring member is not greatly deformed, and the distance between the flow resistance applying member and the floating roof is kept substantially constant.

  On the other hand, when sloshing occurs, the rise and fall of the liquid level due to the fluctuation of the liquid level occurs at a speed much higher than the fluctuation of the liquid level when the liquid storage amount fluctuates. The floating roof and the flow resistance imparting member try to rise or descend as the liquid level fluctuates, but the flow resistance imparting member is given resistance to movement by viscous resistance acting on the link mechanism. For this reason, the flow resistance imparting member is held at substantially the same height, and the connecting spring member between the floating roof and the flow resistance imparting member expands and contracts and does not restrain the floating roof from swinging with the liquid surface. . Thus, since the flow resistance imparting member is held at substantially the same height when sloshing occurs, it intersects with the liquid flow rising and falling near the wall surface and imparts resistance to these flows. As a result, sloshing is effectively attenuated.

  The invention according to claim 11 is the sloshing suppression device according to claim 9 or 10, wherein, instead of the damper, the flow resistance is increased when a displacement speed of the flow resistance applying member becomes a predetermined value or more. It shall have a lock device which restrains displacement of a grant member.

  In this sloshing suppression device, when the amount of stored liquid fluctuates and the liquid level slowly rises or falls, the locking device does not operate, and the flow resistance imparting member rises or falls together with the floating roof. Then, when sloshing occurs and the liquid level fluctuates at a relatively large speed, the lock device is activated to restrain the position of the flow resistance imparting member. At this time, the floating roof is allowed to displace relative to the flow resistance imparting member and swings according to the liquid level. Thus, when the flow resistance applying member is held at substantially the same height when sloshing occurs, resistance can be given to the liquid flow in the vertical direction near the wall body, and sloshing can be effectively attenuated.

  As described above, in the sloshing suppression device according to the present invention, when the sloshing occurs, the flow resistance imparting member intersects the flow of the liquid rising near the wall body or the flow of the falling liquid, thereby disturbing the flow of the liquid. To give resistance. Thereby, the kinetic energy of the liquid is attenuated, and sloshing can be effectively suppressed. In addition, when the liquid storage amount decreases and the liquid level slowly descends, the flow resistance imparting member also descends, and all the stored liquid is discharged and the floating roof descends to a predetermined lowest position. Does not hinder.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic plan view and a schematic cross-sectional view of a sloshing suppression device that is an embodiment of the invention according to claim 1 or claim 2. FIG. 2 is an enlarged cross-sectional view showing the structure of the sloshing suppression device shown in FIG.

  This device suppresses the occurrence of sloshing in the stored liquid in a steel storage tank having a cylindrical wall body 1, a floating roof 2, and a bottom plate 3, and has a predetermined depth below the floating roof 2. The flow resistance imparting member 11 supported by the thickness, the floating body 12 that imparts buoyancy to the flow resistance imparting member 11, the base plate 13 provided on the bottom plate of the storage tank, the base plate 13 and the flow resistance imparting member 11 Or the main part is comprised by the restraint member 14 which connects the floating body 12 and hold | maintains the floating body 12 and the flow resistance provision member 11 which are going to float to the predetermined depth.

  The flow resistance imparting member 11 includes a frame 11a formed in a horizontal direction by a steel mold material, and a mesh member 11b stretched in these frames. As it passes, the flow is disturbed and resistance to flow is imparted. The frame 11a is formed by double forming a frame formed by annularly connecting steel mold members inside the wall, and connecting these in the horizontal radial direction. A net-like member 11b is stretched between the two. And the floating body 12 is integrated in the point part of the said cyclic | annular frame and the member connected to a radial direction, and becomes the steel box which the cyclic | annular frame and the member to connect connect. Yes. This box contains air, and a large buoyancy acts in the liquid.

  The mesh member 11b may be made of various materials such as those made of steel and synthetic fibers, and may be rigid or may be deformed flexibly. The size of the mesh of the mesh member 11b, the thickness of each member constituting the mesh, etc. affect the magnitude of resistance imparted to the flow of the liquid. It can be determined in consideration of viscosity, assumed earthquake motion, dimensions of the flow resistance imparting member, and the like.

  The base plate 13 is made of steel and is placed on the bottom plate 3. The bottom plate 3 has a floating body 12 and a flow resistance imparting member 11 to which buoyancy is imparted by the floating body 12 moored by a restraining member 14, which is sufficient for the levitation force acting on the floating body 12 and the flow resistance imparting member 11. It has a weight that can resist. Further, when sloshing occurs, an upward force is applied to the flow resistance imparting member 11 due to the upward liquid flow generated in the vicinity of the wall body 1. It resists by the weight of the base plate. That is, a reaction force is exerted by imparting resistance to the flow of the liquid, and even when this upward lifting force is transmitted through the restraining member 14, the flow resistance imparting member 11 does not float at all or slightly. It can be held so as not to float.

  The base plate 13 may be joined to the bottom plate 3. In general, the bottom plate 3 is made of a steel plate, and water pressure is uniformly applied to the upper surface. Therefore, the lifting force can be suppressed by the water pressure, but if the lifting force acts in a concentrated manner, the bottom plate may be largely deformed near the point of action. For this reason, it is desirable that the base plate sufficiently reinforces the deformation of the bottom plate.

  The restraining member 14 is made of a steel wire, and connects the flow resistance applying member 11 or the floating body 12 and the base plate 13 to moor the flow resistance applying member 11 at a predetermined height below the floating roof 2. Is. And since it can deform | transform flexibly, it does not restrain that the flow resistance provision member 11 falls, When the liquid level falls by sloshing, When the liquid level falls by the reduction | decrease of stored liquid, flow resistance Looseness occurs between the applying member 11 and the base plate 13, and the flow resistance applying member 11 is allowed to descend.

  In the apparatus as described above, the buoyancy is greater than the gravity acting on the flow resistance imparting member 11 and the floating body 12, and the restraint member 14 is connected to the base plate 13 to float up to the liquid level. It is constrained to float above a predetermined height by a tensile force. Therefore, the flow resistance imparting member 11 is held at a predetermined height below the floating roof 2.

  When the liquid stored in the storage tank is discharged and the amount of stored liquid decreases, the floating roof 2 floating on the liquid surface descends, and the lower surface thereof contacts the flow resistance imparting member 11. When the storage amount further decreases, the floating roof 2 descends while being in contact with the flow resistance imparting member 11 and reaches the lower limit position of the floating roof 2. At this time, the restraining member 14 made of a steel wire is loosened between the flow resistance imparting member 11 and the base plate 13 and deforms to allow the flow resistance imparting member 11 to descend. Further, when the liquid is fed into the storage tank and the amount of storage increases and the liquid level rises, the flow resistance imparting member 11 is also lifted together with the floating roof 2, and the flow resistance imparting member is at a position where the tensile force is applied to the restraining member 14. 11 is held. The floating roof rises further, allowing it to rise to the liquid level when the stored liquid is full.

  In addition, the storage tank provided with such a sloshing suppression device generally has a large cylindrical wall, and when the liquid is discharged or injected by a conduit, the liquid level descends or rises very slowly, and the above floating The descent and rise of the roof 2 and the flow resistance imparting member 11 also occur very slowly.

  On the other hand, in the storage tank as described above, sloshing tends to occur during an earthquake, particularly when an earthquake motion including a long-period component occurs. When sloshing occurs, as shown in FIG. 13, the liquid flows in the horizontal direction near the liquid level in the central portion of the storage tank, and along the wall surface in the vicinity of the wall where the liquid level is rising. It becomes a rising flow. The sloshing period is about 3 to 12 seconds, and the rising or descending height of the liquid level due to the sloshing is about 0.5 to 2 m.

  When such sloshing occurs, an upward flow of liquid occurs in the vicinity of the wall surface at the portion where the liquid level is rising, and the flow resistance imparting member 11 held almost horizontally near the wall body causes the flow of the liquid. Intersect. Accordingly, the liquid passes through the mesh of the flow resistance imparting member 11 and disturbance occurs. This imparts resistance to the flow of the liquid, and the kinetic energy of the liquid is attenuated to suppress sloshing.

  In the portion where the liquid level is lowered, the floating roof 2 is lowered and the liquid flows downward. At this time, the restraining member 14 is flexibly deformed and does not restrain the lowering of the flow resistance imparting member 11, and the flow resistance imparting member 11 is lowered as the liquid flows. At this time, when the descending amount of the floating roof 2 is large, or when the liquid storage amount is slightly small and the floating roof 2 and the flow resistance imparting member 11 are close to each other, the fluid resistance imparting member 11 or the floating body 12 is in contact. However, there is nothing that resists the descent of the flow resistance imparting member 11 and the floating body 12, and it descends together with the floating roof 2, and no large force acts between them.

  The floating roof 2 is provided with an annular beam 2a along the inner peripheral surface of the wall 1, and a horizontally continuous steel plate 2b is provided on the inner side to cover the liquid surface. . The annular beam 2a is hollow, and sufficient buoyancy acts on this beam. An elastic member 2c is attached to the outer surface of the annular beam 2a so as to be continuous in the circumferential direction, and is covered with a thin metal plate 2d. Thereby, when the floating roof 2 moves up and down, the inner peripheral surface of the wall 1 and the floating roof 2 slide smoothly, and the state in which the stored liquid is sealed to the lower side of the floating roof 2 is maintained. It has become a thing.

FIG. 3 is a schematic cross-sectional view showing a sloshing suppression device that is an embodiment of the invention according to claim 3 or claim 4.
This device includes the same flow resistance imparting member 21, floating body 22 and base plate 23 as those shown in FIGS. 1 and 2, but the lower end of the restraining member 24 for anchoring them is directly connected to the base plate 23. Instead, it is connected to the base plate 23 via the winding device 25.

  The winding device 25 functions as a position adjusting means for the flow resistance applying member 21. The lower end of the restraining member 24 made of steel wire is drawn through a pulley 26, and is wound and pulled out by driving a roller 25a. Is to do. The roller 25a is driven by a motor, and the motor is controlled by an electric signal. That is, the height of the liquid level is detected by a liquid level sensor (not shown), and the restricting member 24 is wound or pulled out based on the signal so that the flow resistance applying member 21 has an appropriate height below the liquid level. The drive of the motor is controlled.

  In this apparatus, when the amount of the liquid stored in the storage tank fluctuates and the height of the liquid surface, that is, the position of the floating roof 2 fluctuates, the winding device 25 operates and the flow resistance imparting member 21 becomes liquid. A predetermined depth below the surface is maintained. Therefore, the flow resistance applying member 21 is always held at an appropriate position regardless of the amount of stored liquid, and sloshing can be effectively suppressed.

FIG. 4 is a schematic cross-sectional view showing a sloshing suppression device that is an embodiment of the invention according to claim 3 or claim 5.
In this device, the flow resistance imparting member 31 is suspended and supported from the first floating body 37 via a suspension member 38. That is, although the second floating body 32 fixed to the flow resistance applying portion 31 material is also provided, the second floating body 32 and the flow resistance applying member 31 have greater gravity than the buoyancy acting on them. The floating body 37 is floated in the liquid by the lifting force transmitted from the floating body 37 through the suspension member 38. The position of the first floating body 37 abuts on the lower surface of the floating roof 2 and is restricted, and the flow resistance imparting member 31 is held at a predetermined depth by the length of the suspension member 38.

  The flow resistance imparting member 31 and the base plate 33 are connected by a restraining member 34 made of a steel wire, and the lower end portion of the restraining member 34 is joined to the base plate 33 via a winding device 35. This winding device 35 winds the restraining member 34 wound around the pulley 36 around the roller 35a, and this winding force is applied to the first floating body 37, the second floating body 32, and the flow resistance application. It is set to be smaller than the lifting force acting on the member 31, that is, the force obtained by subtracting the gravity from the acting buoyancy. Further, when the lifting force of the first floating body 37, the second floating body 32, and the flow resistance imparting member 31 is applied, the steel wire is pulled out so that the flow resistance imparting member 31 cannot be raised. In addition, the steel wire is wound and pulled out with a viscous resistance, so that even if a force in the winding direction or a force in the pulling direction is applied, rapid winding or drawing is not performed. , It has been done slowly.

  The winding can be performed, for example, by applying a rotational driving force by a spring or the like to the roller 35a. Moreover, a floating body for driving may be provided to use buoyancy. In addition, the mechanism for applying the viscous resistance is, for example, that the rotation of the roller 35a is interlocked with the impeller 35b provided in the viscous liquid, and the viscous resistance is provided by the impeller 35b rotating in the viscous fluid. Things can be adopted.

  In this apparatus, the first floating body 37 that suspends and supports the flow resistance imparting member 31, the suspension member 38, and the winding device 35 function as position adjusting means, and the first floating body 37 always contacts the floating roof 2. The flow resistance imparting member 31 is held in contact with the floating roof 2 at a predetermined interval. And if the liquid storage amount in a storage tank increases and a liquid level rises, the floating roof 2 will raise, and the 1st floating body 37 and the flow resistance provision member 31 will also raise with this. At this time, a tensile force is applied to the restraining member 34 by the lifting force, and the restraining member 34 is pulled out from the winding device 35 and the flow resistance imparting member 31 is not restrained from rising. On the other hand, when the liquid level is lowered and the flow resistance imparting member 31 is lowered, the tensile force of the restraining member 34 is reduced, and the take-up device operates to wind up the restraining member 34 without causing the restraining member 34 to loosen. A tension smaller than the lifting force always acts on the restraining member.

  When sloshing occurs, the floating roof 2 rises in the portion where the liquid level rises, and the first floating body 37 and the flow resistance imparting member 31 also try to rise. However, the rising speed at this time increases the liquid storage amount. This is much higher than the ascending speed, and viscous resistance acts on the withdrawal of the restraining member 34 so that the flow resistance imparting member 31 does not rise rapidly. Therefore, the flow resistance imparting member 31 crosses the upward liquid flow that occurs near the wall, and imparts resistance to the flow. This suppresses sloshing.

  Instead of the mechanism for applying viscous resistance to the roller 35a of the winding device 35, a lock device that stops the drawing when the restraining member 31 is drawn at a high speed may be employed. As a result, when the sloshing occurs, the liquid level rises, and when the flow resistance applying member is about to rise rapidly, the lock device is activated to restrain the position of the flow resistance applying member 31. This provides resistance to upward liquid flow.

  In the apparatus shown in FIGS. 1 to 4 described above, the flow resistance imparting member is annularly continuous inside the wall body, but the flow resistance imparting member 41 is in the circumferential direction as shown in FIG. It may be divided into a plurality of parts. Moreover, although the floating body which provides buoyancy to the flow resistance imparting member is a box provided with a rating, as shown in FIG. 6, the frame is formed by a hollow tube member 51, It is also possible to adopt one that acts on buoyancy. Furthermore, although the flow resistance imparting member is composed of a single layer, as shown in FIG. 7, two or more layers can be used in an overlapping manner. At this time, the flow resistance imparting members 61a and 61b of a plurality of layers are connected to each other by a steel wire 62, and each of them is supported at a predetermined height while maintaining an interval.

FIG. 8 is a schematic cross-sectional view showing a sloshing suppressing device according to an embodiment of the seventh aspect of the present invention.
This device has the same flow resistance imparting member 71, floating body 72, and base plate 73 as the device shown in FIG. 1, and a plurality of elements 74a are joined together as a restraining member so as to be pivotable by a pivot pin 74b. Thus, a parallel link mechanism 74 is used in which the elements 74a form a parallelogram. The deformation of the parallel link mechanism 74 allows the flow resistance imparting member 71 to rise and fall. A stopper (not shown) is provided so that the flow resistance applying member 71 does not rise above a predetermined height. Further, a damper 75 is provided at a position connecting the parallelogram rating points of the parallel link mechanism 74 on a diagonal line. As this damper 75, for example, a cylinder 75a in which a viscous fluid is accommodated in which a piston 75b having an orifice can be reciprocated can be used. Is given. Therefore, viscous resistance can be imparted even when the quadrilateral of the parallel link mechanism 74 is deformed and the flow resistance imparting member 71 is raised or lowered.

  In such an apparatus, the flow resistance imparting member 71 floats in the liquid by the buoyancy acting on the floating body 72 and is held at a position where the stopper provided on the parallel link mechanism 74 acts. When the liquid storage amount decreases and the floating roof 2 descends, the flow resistance imparting member 71 and the floating body 72 come into contact with the floating roof 2 and descend as the floating roof 2 slowly descends. At this time, since the liquid level descends slowly, the damper 75 does not resist the flow resistance imparting member 71 from descending.

  On the other hand, when sloshing occurs, the liquid flows in the vertical direction near the wall surface as the liquid surface swings. At this time, the damper 75 attached to the parallel link mechanism 74 acts and the position of the flow resistance imparting member 71 does not vary greatly, and the resistance is given by crossing the liquid in the vertical direction. . Further, when the restraining member is made of a wire material such as a steel wire, resistance cannot be given to the flow of the descending liquid, but the damper is also used when the liquid descends by using the parallel link mechanism 74. It acts and can provide resistance to the downward flow of the liquid, and sloshing can be efficiently suppressed.

  In the above embodiment, the parallel link mechanism 74 functions as a restraining member, and the parallel link mechanism 74 regulates the position of the flow resistance imparting member 71. However, FIG. 2, FIG. 3 or FIG. A parallel link mechanism with a damper may be added to a device using a steel wire as a restraining member as in the device shown. In this case, a stopper for restricting the extension of the parallel link mechanism is not provided, and the position of the flow resistance imparting member is held by a restraining member made of a steel wire. By using such a parallel link mechanism, resistance can be imparted to the flow of the descending liquid. Further, by combining with the apparatus shown in FIG. 3 or FIG. 4, the position of the flow resistance imparting member by the steel wire can be adjusted together.

FIG. 9 shows an example in which a parallel link mechanism 84 having a damper 85 is used as a restraining member instead of the restraining member 34 and the winding device 35 made of steel wire of the sloshing suppressing device shown in FIG.
In such an apparatus, when the floating roof 2 rises or descends as the liquid storage amount fluctuates, the floating body 87 and the flow resistance imparting member 81 suspended and supported by the floating body 2 rise or fall with the floating roof 2. . At this time, since the ascending or descending speed is slow, the damper 85 attached to the parallel link mechanism 84 hardly resists deformation of the parallel link mechanism 84. When sloshing occurs, the damper 85 imparts viscous resistance to the deformation of the parallel link mechanism 84, and the flow resistance imparting member 81 is held at substantially the same position without being greatly displaced. Accordingly, resistance can be imparted to the upward liquid flow and the downward flow that occur near the wall 1, and sloshing can be effectively suppressed.

FIG. 10 is a schematic cross-sectional view showing a sloshing suppression device according to an embodiment of the present invention.
This apparatus includes a flow resistance imparting member 91 that imparts resistance to the flow of liquid, a floating body 92 that floats the flow resistance imparting member 91, a base plate 93 provided on the bottom plate 3 of the storage tank, and the base plate 93. One end is joined to the lower surface of the first pulley 95 attached to the top, the second pulley 96 attached to the top of the wall 1 of the storage tank, and the flow resistance imparting member 91, and the first pulley 95 and A connecting member 94 that is wound around the second pulley 96 and has the other end joined to the upper surface of the floating roof 2 and a damper 97 that imparts viscous resistance to the rotation of the first pulley 95 are provided.

  The flow resistance imparting member 91 has a frame body 91a and a net-like member 91b stretched on the frame body, and is incorporated in the grading portion of the frame body 91a, as in the apparatus shown in FIG. It is levitated by the floating body 92. Further, the base plate 93 is the same as the apparatus shown in FIG. 1 and has a sufficient weight or is fixed to the bottom plate 3.

  The connecting member 94 is made of steel wire, one end of which is joined to the flow resistance imparting member 91, is stretched vertically downward in the liquid in the storage tank, and is wound around the first pulley 95. Then, the liquid is pulled vertically upward, inserted into a through hole (not shown) provided in the floating roof 2, and wound around the second pulley 96. Then, it is routed vertically downward again, and the other end is joined to the upper surface of the floating roof 2. The connecting member 94 has a helical spring 94a connected in series with the steel wire between the first pulley 95 and the second pulley 96, and extends when a large tensile force acts on the connecting member. It is like that.

  The damper 97 imparts viscous resistance to the connecting member 94 that moves in the axial direction along with the rotation of the pulley by imparting viscous resistance to the first pulley 95. That is, resistance does not act when the connecting member 94 moves slowly in the axial direction, but if the connecting member 94 tries to move rapidly in the axial direction, resistance is given to this and the movement of the connecting member 94 is extremely slow. It shall be

  In such an apparatus, the position of the flow resistance applying member 91 to which the levitation force is applied is constrained by the tensile force of the connecting member 94, and is in a state of floating in the liquid at a predetermined depth below the floating roof 2. When the amount of liquid in the storage tank fluctuates, for example, when the amount of stored liquid increases and the liquid level and the floating roof 2 rise, the connecting member 94 is loosened, and the flow resistance imparting member 91 rises upward accordingly. Accordingly, the flow resistance imparting member 91 is held at a predetermined depth below the liquid level even when the liquid level rises. Further, when the liquid storage amount is reduced and the liquid level is lowered, the flow resistance imparting member 91 is similarly lowered to allow the floating roof 2 to be lowered to near the bottom plate. Further, when the amount of stored liquid changes in this way, the liquid level changes very slowly, and the damper 97 does not resist the movement of the connecting member 94.

  On the other hand, when sloshing occurs in the liquid in the storage tank during an earthquake or the like, the floating roof 2 repeats rising and lowering near the wall 1 as the liquid level fluctuates. Along with this, the connecting member 94 is pulled downward at the joint end with the floating roof 2 when the floating roof 2 descends, and relaxes when it rises. However, the damper 97 gives viscous resistance to the movement of the connecting member 94 and suppresses the movement. For this reason, the movement of the connecting member 94 due to the rising and lowering of the floating roof 2 is absorbed by the helical spring 94a, and the steel wire on the flow resistance applying member 91 side from the helical spring 94a hardly moves, and the flow resistance applying member 91 is moved. Is held in the liquid with almost no change in position. Such a flow resistance imparting member 91 crosses the liquid that flows upward near the wall when sloshing occurs. As the liquid passes through the mesh of the mesh member 91b, the flow is disturbed, resistance is given to the flow, and sloshing is attenuated.

FIG. 11 is a schematic cross-sectional view showing a sloshing suppression device according to an embodiment of the present invention.
This device includes the same flow resistance applying member 101, the base plate 103, the parallel link mechanism 104, and the damper 105 as the device shown in FIG. 8, but the floating body 102 for applying buoyancy to the flow resistance applying member 101 is The gravity and buoyancy acting on the floating body 102 and the flow resistance imparting member 101 are adjusted so as to be substantially balanced. A steel rod 106 is raised upward from the flow resistance applying member 101 and is inserted through a through hole provided in the floating roof 2 so as to protrude upward. The floating roof 2 holds the steel rod 106 and pulls up the flow resistance imparting member 101 when the liquid level rises, pushes it down when the liquid level falls, and holds it when a compressive force or tensile force greater than a predetermined value is applied. Is provided with a trigger device 107.

  In this apparatus, since the floating roof 2 and the flow resistance imparting member 101 are connected by the steel rod 106, the flow resistance imparting member 101 is held at a predetermined depth below the floating roof 2, and the liquid storage amount varies. Even if the liquid level rises or falls, the distance from the floating roof 2 does not change. When sloshing occurs, the portion of the floating roof 2 that holds the steel rod 106 rapidly rises or falls, but the damper 105 attached to the parallel link mechanism 104 gives viscous resistance and gives flow resistance. The lowering or raising of the member 101 is suppressed. For this reason, a compressive force or a tensile force acts on the steel rod 106, and the trigger device 107 is operated to release the holding of the steel rod 106. As a result, the floating roof 2 swings with the liquid surface, but the flow resistance imparting member 101 is held at a substantially constant position and imparts resistance to the flow of the liquid rising or descending near the wall 1.

FIG. 12 is a schematic cross-sectional view showing a sloshing suppressing device according to an embodiment of the present invention.
This device includes the same flow resistance imparting member 111, the base plate 113, the parallel link mechanism 114, and the damper 115 as the device shown in FIG. 11, and the floating body 112 that imparts buoyancy to the flow resistance imparting member 111 is also shown in FIG. As in the apparatus shown in FIG. 4, the gravity and buoyancy acting on the floating body 112 and the flow resistance imparting member 111 are adjusted so as to be substantially balanced. The flow resistance applying member 111 and the floating roof 2 are connected by a helical spring 116 instead of a steel rod, and the flow resistance applying member 111 is held at a predetermined height.

  In this apparatus, since the floating roof 2 and the flow resistance imparting member 111 are connected by the helical spring 116, the flow resistance imparting member 111 is held at a predetermined depth below the floating roof 2. When the liquid storage amount fluctuates and the liquid level rises or falls, the rise and fall occur very slowly, so that the damper 115 does not give resistance to the deformation of the parallel link mechanism 114. Therefore, even if the flow resistance imparting member 111 is connected to the floating roof 2 by the helical spring 116 that can be flexibly deformed, the flow resistance imparting member 111 rises or descends together with the floating roof 2 while maintaining substantially the same distance. When all the liquid in the storage tank is discharged, the floating roof 2 is allowed to descend to the lower limit position due to the deformation of the parallel link mechanism 114.

  On the other hand, when sloshing occurs, the floating roof 2 repeatedly rises and descends at a relatively high speed, but the damper 115 attached to the parallel link mechanism 114 gives viscous resistance against such swinging, Lowering or raising of the flow resistance applying member 111 is suppressed. For this reason, the helical spring 116 that connects the flow resistance imparting member 111 and the floating roof 2 expands and contracts, and the floating roof 2 swings with the liquid level, but the flow resistance imparting member 111 is held at substantially the same position. As a result, the flow resistance imparting member 11 crosses the upward or downward flow of the liquid that occurs near the wall 1, imparts resistance to the flow of the liquid, and effectively attenuates sloshing.

  In the sloshing suppression device shown in FIG. 11 and FIG. 12, a damper that gives viscous resistance to the operation of the parallel link mechanism is used. Alternatively, a lock mechanism that restricts deformation of the parallel link mechanism may be provided. good. In this locking mechanism, for example, as in the case of the damper, a rod that can be expanded and contracted is arranged between two parallel points on the diagonal of the parallelogram, and the distance between these points is about to change rapidly. Sometimes, it is possible to use a lock that restrains the expansion and contraction of these rods so that the distance between the rating points does not fluctuate. As a result, deformation of the link mechanism is constrained, and the position of the flow resistance applying member does not fluctuate up and down.

It is the schematic plan view and schematic sectional drawing which show the sloshing suppression apparatus which is one Embodiment of the invention which concerns on Claim 1 or Claim 2. It is sectional drawing of the sloshing suppression apparatus shown in FIG. It is a schematic sectional drawing which shows the sloshing suppression apparatus which is one Embodiment of the invention which concerns on Claim 3 or Claim 4. It is a schematic sectional drawing which shows the sloshing suppression apparatus which is one Embodiment of the invention which concerns on Claim 3 or Claim 5. It is a schematic plan view which shows the other example of the flow resistance provision member which can be used instead of the flow resistance provision member of the sloshing suppression apparatus shown to FIGS. It is a schematic plan view which shows the other example of the flow resistance provision member which can be used instead of the flow resistance provision member of the sloshing suppression apparatus shown to FIGS. It is a schematic sectional drawing which shows the other example of the flow resistance provision member which can be used instead of the flow resistance provision member of the sloshing suppression apparatus shown to FIGS. It is one Embodiment of the invention which concerns on Claim 1, Claim 2, or Claim 7, Comprising: It is a schematic sectional drawing which shows the sloshing suppression apparatus using a link mechanism as a restraint member. It is other embodiment of the invention which concerns on Claim 1, Claim 2, or Claim 7, Comprising: It is a schematic sectional drawing which shows the sloshing suppression apparatus which uses a link mechanism as a restraint member. It is a schematic sectional drawing which shows the sloshing suppression apparatus which is one Embodiment of the invention which concerns on Claim 8. It is a schematic sectional drawing which shows the sloshing suppression apparatus which is one Embodiment of the invention which concerns on Claim 9. It is a schematic sectional drawing which shows the sloshing suppression apparatus which is one Embodiment of the invention concerning Claim 10. It is the schematic explaining the state of the liquid level when the sloshing occurs in the cylindrical storage tank and the state of flow of the liquid.

Explanation of symbols

1: Wall body, 2: Floating roof, 3: Bottom plate, 11, 21, 31, 41, 61, 71, 81, 91, 101, 111: Flow resistance imparting member, 11a, 91a: Frame body, 11b, 91b: Net member, 12, 22, 72, 87, 92, 102, 112: floating body, 13, 23, 33, 73, 83, 93, 103, 113: foundation plate, 14, 24, 34: restraining member, 25, 35 , 97: Winding device, 25a, 35a: Roller, 26, 36: Pulley, 35b: Impeller, 32: Second floating body, 37: First floating body, 38: Suspension material, 51: Pipe member, 62: Connecting member, 74, 84, 104, 114: Parallel link mechanism, 75, 85, 105, 115: Damper, 75a: Cylinder, 75b: Piston, 94: Connecting member, 94a: Spiral spring, 95: First pulley 96: Second pulley 106: steel rod 107: trigger device 116: helical spring

Claims (11)

A flow resistance imparting member for imparting resistance to the liquid held near the wall in the vicinity of the wall in the liquid storage tank having a cylindrical wall and moving upward near the wall;
A floating body that floats the flow resistance imparting member in a liquid;
One end is connected to the flow resistance applying member or the floating body, the other end is connected to a wall body of the liquid storage tank, a bottom plate or a base plate provided on the bottom plate, and the flow resistance applying member is connected to a predetermined subsurface of the liquid surface. A sloshing suppression device characterized by having a restraining member that maintains the depth and allows the flow resistance imparting member to descend when the liquid level decreases.   The flow resistance imparting member has one or more members selected from a net-like member, a perforated plate, a plurality of bar-like members arranged at intervals, a lattice-like member, and a plurality of divided flat plates. The sloshing suppression device according to claim 1 characterized by things.   The sloshing suppression device according to claim 1, further comprising a position adjusting unit that adjusts a position of the flow resistance applying member held by the restraining member in accordance with an amount of liquid stored in the storage tank. The restraining member is a wire or chain member that is flexibly deformed,
The position adjusting means includes a winding device capable of winding or pulling out one end of the restraining member,
The winding device winds up or pulls out the restraint member in response to a liquid level fluctuation caused by a change in the amount of stored liquid, and locks the winding and withdrawal of the restraining member when a liquid level fluctuation exceeding a predetermined speed occurs. The sloshing suppression device according to claim 3, wherein The floating body floats in a state where the flow resistance imparting member is suspended and supported by a wire or a chain member,
The restraining member is a wire or chain member that is flexibly deformed,
The position adjusting means includes a winding device capable of winding or pulling out one end of the restraining member,
The winding device pulls out the restraining member when a tensile force of a predetermined value or more acts on the restraining member, and pulls the restraining member when the tensile force is smaller than the predetermined value or a second predetermined value smaller than the predetermined value. The sloshing suppression device according to claim 3, wherein the sloshing suppression device is provided for winding, and includes a damper that imparts viscous resistance to the winding and drawing operation of the restraining member. The floating body floats in a state where the flow resistance imparting member is suspended and supported by a wire or a chain member,
The restraining member is a wire or chain member that is flexibly deformed,
The position adjusting means is a winding device capable of winding or pulling out one end of the restraining member,
The winding device pulls out the restraining member when a tensile force of a predetermined value or more acts on the restraining member, and pulls the restraining member when the tensile force is smaller than the predetermined value or a second predetermined value smaller than the predetermined value. The sloshing suppression device according to claim 3, wherein the sloshing suppression device is provided for winding, and includes a lock mechanism that stops the operation when the speed of winding and pulling out the restraining member becomes equal to or higher than a predetermined speed. A plurality of rod-like elements are rotatably connected, and a link mechanism for connecting the flow resistance imparting member and a base plate or a base plate provided on the bottom plate is provided as the restraining member or together with the restraining member,
The sloshing suppression device according to claim 1, wherein the link mechanism has a damper that imparts viscous resistance to its operation. A flow resistance imparting member for imparting resistance to the liquid held near the wall in the vicinity of the wall in the liquid storage tank having a cylindrical wall and moving upward near the wall;
A floating body that floats the flow resistance imparting member in a liquid;
One end is connected to the flow resistance imparting member or the floating body, and is hung around the hanging member whose position is fixed to the bottom of the liquid storage tank and the hanging member whose position is fixed at the upper part of the wall body. The other end of the wire or chain member is connected to the upper surface of the floating roof that floats on the liquid surface, and a connecting member in which a stretchable elastic member is inserted in the middle of the wire or chain member When,
When the damper which gives the viscous resistance with respect to the movement of the connecting member in the axial direction to the connecting member closer to the flow resistance applying member than the elastic member, or when the movement of the connecting member in the axial direction becomes a predetermined speed or more A sloshing suppression device comprising: a lock mechanism that restrains the connecting member closer to the flow resistance applying member from the elastic member from moving in the axial direction. A flow resistance imparting member that is held below the liquid surface in the vicinity of the wall body in the liquid storage tank having a cylindrical wall body and imparts resistance to the liquid that moves in the vertical direction near the wall body;
A plurality of rod-like elements are rotatably connected, and a link mechanism that connects the flow resistance imparting member and a base plate or a base plate provided on the bottom plate,
A damper that imparts viscous resistance to the operation of the link mechanism;
A connecting member that connects the floating roof in the storage tank and the flow resistance imparting member, and holds the flow resistance imparting member at a predetermined depth below the liquid level even when the amount of stored liquid in the storage tank varies. ,
A sloshing suppression device comprising: a trigger device that releases restraint by the connecting member between the floating roof and the flow resistance imparting member when sloshing occurs in the liquid in the storage tank. A flow resistance imparting member that is held below the liquid surface in the vicinity of the wall body in the liquid storage tank having a cylindrical wall body and imparts resistance to the liquid that moves in the vertical direction near the wall body;
A plurality of rod-like elements are rotatably connected, and a link mechanism that connects the flow resistance imparting member and a base plate or a base plate provided on the bottom plate,
A damper that imparts viscous resistance to the operation of the link mechanism;
A connecting spring member that connects the floating roof in the storage tank and the flow resistance applying member, and holds the flow resistance applying member at a predetermined depth below the liquid level even when the amount of stored liquid in the storage tank fluctuates. The connecting spring member is characterized in that, when sloshing occurs in the liquid in the storage tank, the gap between the floating roof and the flow resistance imparting member is allowed to fluctuate. Sloshing suppression device. 11. A lock device that restrains displacement of the flow resistance applying member when the displacement speed of the flow resistance applying member becomes a predetermined value or more, instead of the damper. The sloshing suppression device described in 1.

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