JP4676801B2 - Anti-sloshing damper - Google Patents

Description

  The present invention relates to a damper that prevents sloshing (liquid level fluctuation) that occurs in a crude oil tank or the like due to an external force such as an earthquake, and in particular, can be expanded and contracted smoothly and reliably in conjunction with the liquid level of the stored liquid, The present invention relates to a anti-sloshing damper that can maintain a stretched state without being rolled up with respect to an oscillating internal liquid and can reliably and effectively prevent the occurrence of sloshing.

Generally, a floating roof type tank is known as a tank (storage tank) for storing and storing a large amount of liquid such as crude oil (crude oil, kerosene, gasoline, naphtha, light oil, etc.).
The floating roof type tank has a cylindrical tank body that opens at the top without a roof as a storage tank, and has a structure in which a thin steel plate called floating roof is floated on the liquid level of crude oil etc. stored in this tank body Yes.
Such a floating roof type tank is particularly large because it can store and store crude oil etc. in a good condition without requiring a roof of the tank body, and can be installed at a lower cost than a dome type tank with a roof. Widely used as large-capacity crude oil tanks.

FIG. 12 is a cross-sectional front view of a tank schematically showing a general floating roof type tank.
As shown in the figure, the floating roof type tank includes a cylindrical tank body 1 having an open top, and a floating roof 2 floated on a liquid surface of crude oil or the like stored and stored in the tank body 1.
The floating roof 2 is made of a thin steel plate or the like formed in a disk shape corresponding to the tank shape, and a hollow floating box called a pontoon 3 is connected in an annular shape along the outer peripheral edge. It comes to float on the liquid surface.
Between the outer peripheral edge of the pontoon 3 and the side wall 1a of the tank body 1, a sealing device 4 is arranged in an annular shape so that the inside of the tank is shielded from the outside and is airtight. Intrusion of rainwater is prevented.

The floating roof 2 is held by guide poles 5 and 5 penetrating the pontoon 3 so as not to move or rotate in the tank. The guide ball 5 is a columnar member fixed to the side wall 1 a of the tank body 1 and penetrates the pontoon 3 to prevent the floating roof 2 from rotating and moving.
Further, the tank body 1 is provided with a rolling ladder 6 so that an operator can descend from the side wall 1a to the upper surface of the floating roof 2. The rolling ladder 6 is a ladder having a rotating structure that follows the lifting and lowering operation of the floating roof 2, and an operator can lift the floating roof 2 through a rolling ladder 6 from a measurement hut (not shown) provided on the upper side wall of the tank body 1. You can go down.
In addition, although not shown in FIG. 12 for the floating roof type tank, a roof drain for discharging rainwater or the like accumulated on the upper surface of the floating roof 2 to the outside, a gauge pole for monitoring the height of the floating roof 2, etc. Is to be provided. The gauge pole may be used also as a guide pole.

By the way, in various tanks (tanks) that contain and store a large amount of liquid, such as the floating roof type tank as described above, the contained liquid (internal fluid) due to external force and vibration force applied to the tank It is known that so-called sloshing occurs.
For example, in a large tank such as a crude oil tank that stores crude oil, sloshing with a large amplitude may be caused by an external force such as an earthquake. When such sloshing occurs, the tank is damaged or the contained liquid is Overflow may cause crude oil to leak out of the tank. Such a leakage of crude oil or the like may lead to an accident such as a fire or explosion in the worst case.

FIG. 13 is a cross-sectional front view of the tank schematically showing a state where sloshing occurs in the floating roof type tank.
As shown in the figure, when sloshing occurs due to an earthquake or the like, the liquid level of the liquid stored in the tank greatly fluctuates, and accordingly, the floating roof 2 made of a thin steel plate is also greatly bent and fluctuated. Move and deform.
As a result, the liquid that is greatly swung and waved may overflow the sidewall 1a. Further, since the floating roof 2 is also greatly bent and deformed together with the liquid level, a gap is formed between the sealing device 4 blocking the inside and outside of the tank and the side wall 1a, and the pontoon 3 and the guide pole 4 are loaded and damaged. The pontoon 3 sinks below the liquid level, and the liquid in the tank may flow out and leak to the upper surface of the floating roof 2.
When the overflowed and leaked liquid is crude oil or the like, there is a risk of fire or explosion even if there is a slight ignition. For this reason, suppression and prevention of sloshing in a crude oil tank or the like is an extremely important issue.

Here, it is known that the sloshing as described above becomes particularly intense when the period of external force such as an earthquake coincides with the natural period of the tank liquid surface, and the sloshing height (see H shown in FIG. 13) also increases. It has been. It is known that the liquid reciprocates horizontally in the tank during sloshing.
For this reason, in order to suppress and prevent sloshing, it is effective to divide the storage space inside the tank into a small space by dividing it with a number of partition plates and the like, and to suppress the liquid movement between the small spaces, It is known that this makes it possible to attenuate the energy of the liquid that oscillates in the tank.
Since the purpose of dividing the tank into small spaces is to add resistance to liquid movement, it does not constitute a completely sealed small space, but allows a certain amount of liquid movement between the small spaces. What is necessary is an incomplete division.

So far, in a floating roof type tank, by suspending a large number of partition plates from the lower surface side of the floating roof, the inside of the tank such as a crude oil tank is divided into a large number of small spaces, and the liquid movement between the small spaces is prevented. An anti-sloshing device that attempts to suppress sloshing by adding resistance has been proposed (for example, see Patent Document 1).
JP 53-047014 (page 3-4, Fig. 2-3)

However, the anti-sloshing device that partitions the inside of the tank with a large number of partition plates proposed in the past is a theoretical or conceptual idea. In reality, there are problems to be solved as described below. It has not yet been put to practical use in roof-type crude oil tanks.
First, when the inside of the tank of the floating roof type tank is partitioned by a partition plate, it is necessary to expand and contract the partition plate suspended from the floating roof according to the floating roof that moves up and down according to the remaining amount of liquid stored. . However, in the case of a partition plate in which a large number of frames formed in a lattice shape in a conventionally proposed anti-sloshing device are assembled, if the number of stages is increased, the structure of the frame body becomes complicated, and the partition plates at each step interfere with each other. Therefore, even if multiple stages can be realized, a complicated fitting structure is required, so it is extremely difficult to smoothly move up and down according to the liquid level. As a result, the function as the anti-sloshing device may not be maintained.

In addition, when adopting a conventionally proposed partition plate made of a lattice-shaped frame without using multiple stages, the height of the partition plate needs to be about half the height of the tank in order to obtain a sufficient sloshing suppression effect. Therefore, when the amount of stored liquid decreases, there is always a dead space for the height of the partition plate between the floating roof and the bottom of the tank, and there is a problem that the tank storage capacity cannot be used. did.
If there is a gap between the liquid level of crude oil or the like in the tank and the floating roof, vaporized volatile gas will stay and there is a risk of explosion. For this reason, the liquid level and the floating roof must always be in close contact with each other. Therefore, when the partition plate is suspended from the lower surface of the floating roof, if the remaining amount of liquid decreases and the partition plate hits the bottom of the tank, the floating roof cannot be lowered any further. The dead space is always as high as one partition board.

Further, when the partition plate is simply suspended from the floating roof, when the sloshing occurs, the partition plate is wound up by the oscillating internal fluid, and the sloshing suppression function does not work.
In order to suppress sloshing by partitioning the inside of the tank, it is necessary that the partition plate or the like is stretched with respect to the internal fluid that oscillates when sloshing occurs.
However, in the conventional proposal that is simply suspended from the floating roof in the tank, it is easily wound up by the pressure of the oscillating liquid, and in reality, there is a problem that it cannot function effectively as a sloshing suppression device. It was.

  The present invention has been proposed in order to solve the above-described problems of the prior art, and in conjunction with the liquid level in the tank, the present invention can be expanded and contracted smoothly and reliably, and the internal fluid that oscillates. It is possible to maintain a stretched state without being rolled up, and it is possible to reliably and effectively prevent the occurrence of sloshing. Furthermore, there is no useless dead space in the tank, and in particular a floating roof An object of the present invention is to provide an anti-sloshing damper suitable for a crude oil tank or the like.

To achieve the above object, sloshing preventing damper of the present invention is a damper for sloshing prevention disposed in the tank for storing the liquid, the plate-like member disposed in parallel with the liquid surface in the tank Are connected in a foldable manner in the tank height direction, the upper plate member is disposed in conjunction with the liquid level in the tank, and the lower plate member is fixed to the bottom of the tank, A partition member that is expanded and folded in the tank height direction in conjunction with the liquid surface position in the tank is provided.
In particular, as described in claim 2, when the tank is a floating roof type tank including a floating roof that floats on the liquid level in the tank, the upper end of the partition member is fixed to the lower surface of the floating roof. is there.

The anti-sloshing damper of the present invention includes a buffer member disposed at the upper end of the partition member, and the buffer member includes a column pair in which a foldable column is opposed to each other, and both the column pair. An elastic member for connecting the bent portion, the lower end of each column of the column pair is attached to the upper end of the partition member, and the upper end of the column is disposed in conjunction with the liquid level in the tank.
Furthermore, the anti-sloshing damper of the present invention is surrounded by two adjacent pairs of struts, the liquid level in the tank, and the plate-like member at the upper end of the partition member when a plurality of buffer members are provided at the upper end of the partition member. The thin film member having flexibility is disposed in the space formed in this manner.

Then, more specifically, sloshing preventing damper of the present invention, the partition member, and the hard plate to freely linked two pair of flat plates arranged opposite folding, tank height direction the rigid plate And a plurality of these rigid plates and connecting members are connected in the tank height direction.

Further, the anti-sloshing damper of the present invention includes a wire stretched between connecting members positioned above and below the developed rigid plate when the partition member is deployed.
Further, the anti-sloshing damper of the present invention includes a wire that is stretched between the developed partition member and the tank bottom when the partition member is deployed.

In addition, the anti-sloshing damper of the present invention includes a levitation member that levitates the partition member in the liquid in the tank.
Furthermore, the anti-sloshing damper according to the present invention includes a foldable reinforcing column that is installed between the connecting members positioned above and below the deployed rigid plate when the partition member is deployed, and is folded when the partition member is folded. It can be set as the structure provided.

According to the anti-sloshing damper of the present invention having the above-described configuration, the partition member made of a foldable plate-like member is arranged so that the upper end is interlocked with the liquid level at the liquid level in the tank, and the lower end Is fixed to the bottom of the tank, the damper can be moved up and down in the tank in conjunction with the tank liquid level and deployed.
That is, the partition member that partitions the inside of the tank is smoothly expanded and folded in conjunction with the liquid level in the tank. Can be partitioned into small spaces.
Accordingly, the tank partitioned into the small spaces is limited in terms of sloshing because the movement of the liquid between the small spaces is restricted even when an external force such as an earthquake is applied.

In addition, in the anti-sloshing damper of the present invention configured with a foldable partition member, the partition member is folded and folded to the bottom of the tank when the remaining amount of liquid in the tank decreases, so the folded partition member All the liquid in the tank can be used (discharged), leaving a space corresponding to the height (thickness).
Moreover, the damper can be stored in the space of the folded state, there is no useless dead space in the tank, and sloshing can be effectively suppressed while maximizing the tank capacity. An economical and reliable anti-sloshing damper can be realized.

In particular, according to the anti-sloshing damper of the present invention, the damper is linked to the floating roof floating on the liquid surface by attaching and fixing the upper end of the damper to the lower surface of the floating roof provided in the floating roof tank by welding or the like. Can be expanded and folded freely.
Liquid overflow and leakage due to tank sloshing are particularly likely to occur in floating roof tanks, and by providing the sloshing prevention damper of the present invention, it is possible to effectively eliminate or eliminate the adverse effects of sloshing in floating roof tanks. It becomes like this.

Here, a buffer member can be disposed between the liquid level (floating roof) in the tank and the partition member, and even if the floating roof and the partition member swing due to an earthquake or the like, the floating roof and the partition member Can be prevented and damage to the damper, floating roof, tank, etc. can be effectively prevented.
Further, in the present invention, the rigid plate and the connecting member are coupled to each other by a coupling wire so that when the hydraulic pressure acts on the rigid plate due to the reciprocating motion of the liquid, The connecting portion between the rigid plate and the connecting member is completely fixed, and it behaves as a rigid partition member in which the rigid plate and the connecting portion are integrated, and smooth expansion and folding operations are possible.

In addition, a wire for connecting the partition member and the tank bottom can be provided, whereby the force applied to the partition member can be absorbed by the tank bottom, and the swing of the partition member can be reduced and the tank side wall can be reduced. Contact and interference with the partition member can also be prevented. In this case, by providing a floating member that floats the partition member in the liquid in the tank, the partition member folded in multiple stages can be developed from the lower stage side, and the wire that connects the partition member and the tank bottom is broken, etc. It can be extended without causing the wire to effectively suppress the swinging of the partition member by the wire.
Furthermore, by providing a folding support column that can be folded between the connecting members positioned above and below when the partition member is deployed, the deployed state of the partition member can be maintained more firmly, especially with multiple dampers. Thus, a damper suitable for a large tank whose weight is increased can be realized.

Here, the anti-sloshing damper according to the present invention is a simple member such as a flat plate or H steel, and realizes the anti-sloshing damper that smoothly expands and folds in conjunction with the tank liquid level at a low cost. be able to.
A damper consisting only of a simple member such as a flat plate or H steel can be easily manufactured and assembled. For example, it can be manufactured in accordance with the shape of the manhole on the tank side wall. Simplification is also possible.

That is, according to the anti-sloshing damper of the present invention, the anti-sloshing damper can be arranged in accordance with the shape of a tank such as a crude oil tank, so that the tank can be freely partitioned. For example, the partition member can be arranged in an arbitrary shape such as a radial shape, a frame shape, or an annular shape in the tank space.
In this way, according to the shape and size of the tank, etc., the anti-sloshing damper can be arranged in an optimal shape and can be expanded and contracted in the tank, and can be used for tanks of all shapes and sizes. It is possible to provide a sloshing-preventing damper that is excellent in performance and expandability.

Note that the anti-sloshing damper of the present invention can be applied to a tank without a floating roof, for example, by providing a floating member (floating element) that floats on the liquid level in the tank at the upper end of the partition member.
That is, the anti-sloshing damper of the present invention can be applied not only to a floating roof type tank but also to a tank without a floating roof, for example, a dome type tank, and can be applied to all types of tanks. Sloshing prevention damper with excellent versatility and expandability can be realized.

As described above, according to the anti-sloshing damper of the present invention, the damper can be expanded and contracted smoothly and reliably in conjunction with the liquid level in the tank, and can be wound up with respect to the oscillating internal liquid. And can maintain the deployed state.
As a result, the occurrence of sloshing can be reliably and effectively prevented, and no dead space is generated in the tank.
Therefore, it is possible to realize a sloshing prevention damper particularly suitable for a floating roof type crude oil tank or the like.

Hereinafter, preferred embodiments of the anti-sloshing damper according to the present invention will be described with reference to the drawings.
[First embodiment]
The sloshing prevention damper which concerns on 1st embodiment of this invention is demonstrated referring FIGS. 1-4.
[tank]
First, a tank such as a crude oil tank to which the anti-sloshing damper 10 of the present invention is applied will be described with reference to FIG.
FIG. 1 is a cross-sectional front view of a tank provided with a sloshing prevention damper 10 according to an embodiment of the present invention.
The tank shown in the figure is a floating roof type tank that constitutes a crude oil tank or the like for storing and storing a large amount of crude oil, etc., except that a sloshing prevention damper 10 is provided. The configuration is the same as that of the roof tank (see FIG. 12).

Specifically, the tank shown in FIG. 1 includes a cylindrical tank body 1 having an open top, and a floating roof 2 floated on a liquid surface of crude oil or the like stored and stored in the tank body 1.
The floating roof 2 is made of a thin steel plate or the like formed in a disk shape corresponding to the tank shape, and a hollow floating box called a pontoon 3 is connected in an annular shape along the outer peripheral edge. It comes to float on the liquid surface.
Between the outer peripheral edge of the pontoon 3 and the side wall 1a of the tank body 1, a sealing device 4 is arranged in an annular shape so that the inside of the tank is shielded from the outside and is airtight. Intrusion of rainwater is prevented.

The floating roof 2 is held by guide poles 5 and 5 penetrating the pontoon 3 so as not to move or rotate in the tank. The guide ball 5 is a columnar member fixed to the side wall 1 a of the tank body 1 and penetrates the pontoon 3 to prevent the floating roof 2 from rotating and moving.
Further, the tank body 1 is provided with a rolling ladder 6 so that an operator can descend from the side wall 1a to the upper surface of the floating roof 2. The rolling ladder 6 is a ladder having a rotating structure that follows the lifting and lowering operation of the floating roof 2, and an operator can lift the floating roof 2 through a rolling ladder 6 from a measurement hut (not shown) provided on the upper side wall of the tank body 1. You can go down.

In addition, although not shown in the tank of the present embodiment, a roof drain for discharging rainwater and the like accumulated on the upper surface of the floating roof 2 to the outside, a gauge pole for monitoring the height of the floating roof 2, and the like are provided. Is the same as a general floating roof tank.
And the sloshing prevention damper 10 is equipped in the tank main body 1 of the above floating roof type tanks.

[Sloshing prevention damper]
Hereinafter, a specific configuration of the anti-sloshing damper 10 according to the first embodiment of the present invention will be described.
FIG. 2 is an enlarged perspective view of a main part of the anti-sloshing damper 10 according to the first embodiment of the present invention. FIG. 3 is a plan view showing an example of an arrangement pattern in the tank of the anti-sloshing damper 10 according to the present embodiment. FIG. 3A shows a case where the anti-sloshing damper 10 is arranged radially via the frame ring 10a. Is the case where they are similarly arranged in a pentagonal shape.
As shown in FIG. 2, the anti-sloshing damper 10 of this embodiment includes a partition member 11 and a buffer member 12.

Specifically, the partition member 11 includes a rigid plate 13, a connecting member 14, and a coupling wire 15.
As shown in FIG. 2, the rigid plate 13 is composed of a pair of flat plates in which two flat plates 13 a that can be folded from the center are arranged so as to face each other symmetrically.
The connecting member 14 is made of H steel, and serves as a base material for connecting the rigid plate 13 made of a flat plate pair as described above vertically in the tank height direction. A plurality of rigid plates 13 are connected in the tank height direction via the connecting member 14.

Here, as shown in FIG. 2, the flat plate 13a constituting the rigid plate 13 is configured so that all the flat plates 13a have the same width (the length in the tank height direction when the damper is deployed). The width of 13a can be made different for each rigid plate 13 unit (a pair of two flat plates 13a).
For example, the width of the flat plate 13a on the upper side of the damper is reduced, and the flat plate 13a having a larger width is provided on the lower side, or two types of flat plates 13a having different widths are alternately provided in units of the rigid plate 13. Good.
Even when flat plates 13a having the same width are used, for example, the width of the flat plate 13a can be appropriately varied according to the size of the tank, the structure, the viscosity of the liquid stored in the tank, and the like.

A connecting member 14b disposed at the lowest position of the partition member 11 is attached and fixed to the tank bottom 1b.
Here, the lowermost connecting member 14b of the partition member 11 fixed to the tank bottom 1b can be directly fixed to the tank bottom 1b. However, in the present embodiment, as shown in FIG. The base 7 is disposed and fixed at intervals, and the lowest connecting member 14b is mounted and fixed on the upper surface of the base 7. By providing the base 7 on the tank bottom 1b in this way, a space is created between the connecting member 14b and the tank bottom 1b, and it becomes easy to perform cleaning, maintenance, etc. when the tank is released, and a tank space partitioned by the partition member 11 The inflow and discharge of liquid into the inside can be performed smoothly.

The base 7 may be of any shape, size, and material as long as it functions as a spacer that can form a fixed space at the lower end of the partition member 11 and the tank bottom 1b. As shown in FIG. 3, a rectangular parallelepiped base 7 having a certain height is arranged on the tank bottom 1b at a predetermined interval according to the arrangement pattern, size, etc. of the damper.
In addition, you may make it fix the lowermost rigid board 13 of the partition member 11 instead of the connection member 14 to the stand 7 (or tank bottom part 1b). In that case, the rigid plate 13 is rotatably connected to the base 7 (or the tank bottom 1b).

As shown in FIG. 2, the coupling wire 15 is stretched between the upper end and the lower end of the flat plate 13a constituting the rigid plate pair, and specifically, on the upper side and the lower side of the flat plate 13a. It is stretched between the connecting members 14 positioned in the vertical and cross directions.
By providing the coupling wire 15 in this way, the rigid plate 13 can extend the flat plate 13a to the place where the coupling wire 15 is stretched. Further, the flat plate 13a can be folded and contracted, and can be expanded and contracted vertically.
The connecting wire 15 may be any member that can be stretched between the upper and lower connecting members 14 and can be bent, such as a chain member or a chain. It is preferably formed of a glass fiber material that is not corroded or damaged.

As shown in FIG. 2, the buffer member 12 is composed of a column pair 16 a in which columns 16 capable of folding the back surface are arranged so as to face each other symmetrically, and an elastic member that connects the bent portions of both columns 16 of the column pair 16 a. 17, a flexible thin film member 18 disposed between the column pair 16 a, and an attachment member 19 for attaching the buffer member 12 to the lower surface of the floating roof 2.
The lower end of the column 16 is rotatably connected to the uppermost connecting member 14 a of the partition member 11, and the upper part is rotatably connected to the installation member 19.
An elastic member 17 such as a coil spring is disposed on the column pair 16 composed of two pairs of columns 16 opposed to each other, and the bent portions of both columns 16 constituting the column pair 16a are connected. As a result, the vibrations of the floating roof 2 and the partition member 11 propagate to the support column 16 but are absorbed by the elastic force of the elastic member 17.
A plurality of the buffer members 12 including the pair of columns 16 and the elastic member 17 are arranged along the tank horizontal direction (lateral direction) on the upper end side of the uppermost connecting member 14a. .

As shown in FIG. 2, the thin film member 18 is surrounded by two adjacent column pairs 16a among the plurality of column pairs 16a arranged in the tank horizontal direction, the floating roof 2, and the uppermost connecting member 14a of the partition member. It is a thin film member which has the flexibility arrange | positioned in the four-sided space formed. The thin film member 18 is extended along the vertical direction of the tank in a four-sided space formed by providing the buffer member 12 at the upper end of the damper, thereby suppressing free movement of liquid in the gap between the upper end of the damper and the floating roof. Is.
Specifically, the thin film member 18 is made of a flexible film material, the upper edge portion of the film material is fixed to the installation member 19, and the lower edge portion is connected to the uppermost connecting member 14 a of the partition member 11. The thin film member 18 is flexibly expanded in the four-sided space even if the column pair 16a expands and contracts due to the position variation of the floating roof 2 and the partition member 11 due to the positional variation of the floating roof 2 and the partition member 11. ing.
And this thin film member 18 is each arrange | positioned between the support | pillar pair 16a which adjoins the support | pillar pair 16a arrange | positioned in multiple numbers by the tank horizontal direction.

Here, the thin film member 18 may be made of any material as long as it is a flexible thin film member. However, like the bonding wire 15, the thin film member 18 is corroded or damaged by crude oil stored in the tank. For example, it is preferable to form the glass fiber material. The thin film member 18 functions as a member for assisting the partition in the tank, and the damper can be used even when this is omitted.
By providing the buffer member 12 of this embodiment, when the floating roof 2 floating on the tank liquid level moves with the transition of the tank liquid level, the buffer member 12 attached to the lower part of the floating roof 2 is While the elastic member 17 receives the elastic force, it moves while expanding and contracting the column pair 16. Then, since the buffer member 12 is connected to the uppermost connecting member 14 a of the partition member 11, the movement of the buffer member 12 extends or compresses the partition member 11.

The damper 10 having the above configuration is connected in the tank horizontal direction, and is arranged in a predetermined pattern in the tank via a frame ring 10a formed of a metal rod-like member or the like. It is like that.
As shown in FIG. 2, the anti-sloshing damper 10 of the present embodiment, because the rigid plate 13 of the partition member 11 protrudes outward in the folded state, interferes with the tank side wall 1 a and other adjacent partition members 11. , It is necessary to arrange so as not to contact. For example, the damper 10 can be arranged in a straight line, and can be arranged at a certain distance from the tank side wall 1a. Therefore, in the present embodiment, a plurality of dampers 10 are connected in a straight line in the tank horizontal direction, and the dampers 10 are connected in accordance with the tank shape via a rod-shaped member or the like. For example, FIG. It can arrange | position so that it may become a planar shape as shown.

In the example shown in FIG. 3 (a), the anti-sloshing damper 10 shown in FIG. 2 is connected in a radial pattern via a frame ring 10a made up of two large and small circular rod members located on a plane concentric circle. It is arranged in the tank.
In the example shown in FIG. 3 (b), one perfect circular frame ring 10a is provided along the inner periphery of the tank side wall, and the damper 10 is connected in a pentagonal shape inside the perfect circular ring. Yes.
For example, a plurality of such frame rings 10a are arranged in the tank height direction, and can be connected and fixed to the upper, middle, and lower stages of the damper 10 configured in multiple stages by welding or the like.
In this way, the damper 10 can be arranged in an optimum pattern according to the shape, size, etc. of the tank via the frame ring 10a serving as a connecting means. The patterns shown in FIGS. 3A and 3B are examples, and the shapes and the like of the damper 10 and the frame ring 10a can be arbitrarily set.

The plurality of dampers 10 connected in a straight line can be fixed by welding adjacent rigid plates 13 to each other. In that case, all the adjacent rigid plates 13 may be fixed, but only a part may be fixed as long as the damper 10 is connected linearly.
In the present embodiment, the frame ring 10a for connecting the damper 10 is ring-shaped (annular), but it is not necessarily required to be ring-shaped as long as it is a connecting means that can connect the damper 10 in an arbitrary pattern.
Further, a buffer material 10b can be provided on the outer periphery of the frame ring 10a between the tank body 1 and the side wall 1a. Depending on the outer diameter of the frame ring 10a, the side wall 1a of the tank body 1 may slidably contact with and interfere with the side wall 1a. In such a case, the side wall 1a due to the slidable contact with the frame ring 10a is provided by providing the buffer material 10b. Can be prevented.

In the present embodiment, as described above, the lowermost connecting member 14b of the damper 10 is fixed to the tank bottom 1b. However, by providing the frame ring 10a, the load applied to the tank bottom 1b is distributed. Can be made.
Generally, in a crude oil tank or the like, the tank bottom 1b has a structure in which plates are bonded together, and fixing a multistage damper 10 that moves up and down in the tank and applies sloshing pressure only by the tank bottom 1b is strong. There may be a shortage.
In this embodiment, the damper 10 is fixed to the frame ring 10a, and the frame ring 10a abuts against the side wall 1a of the tank body 1 via the cushioning material 10b. It is dispersed and absorbed by the tank side wall 1a, and the load applied to the tank bottom 1b can be reduced.

Next, the operation of the anti-sloshing damper according to this embodiment configured as described above will be described.
First, in a state where a predetermined amount of liquid (for example, crude oil or the like) is stored in the tank, as shown in FIG. 1, the damper 10 is deployed in conjunction with the floating roof 2 floating on the liquid surface. In this state, the storage tank space in the tank is divided into small spaces by the damper 10 and partitioned.
In this way, in the tank in which the reservoir space is partitioned into small spaces, the movement of the liquid between the small spaces is restricted, so that sloshing is suppressed.

In this state, when an external force such as an earthquake is applied to the tank body 1, in the case of a tank not provided with the damper 10, sloshing occurs due to an earthquake or the like as shown in FIGS. The liquid level of the liquid stored in the tank largely fluctuates, and the floating roof 2 also largely bends and fluctuates and deforms, so that the liquid in the tank flows out and leaks.
On the other hand, in the tank body 1 provided with the anti-sloshing damper 10 of the present embodiment, the tank is partitioned into a small space by the partition member 11 that is maintained in a state of being expanded and expanded according to the remaining amount of liquid. Even when an external force such as an earthquake is applied, the movement of the liquid between the small spaces is restricted, so that the occurrence of sloshing is suppressed and prevented.

  Here, the sloshing is a reciprocating motion of the liquid in the tank, and the pressure of the reciprocating internal fluid is repeatedly applied to the damper 10 extended in the tank. In the present embodiment, since the lower end side of the damper 10 is fixed to the tank bottom 1b, the damper 10 is maintained unfolded in the tank without being wound up by the internal fluid, whereby the damper 10 is prevented from sloshing. Will function effectively.

When the remaining amount of liquid in the tank body 1 decreases, as shown in FIG. 4, the floating roof 2 that floats on the liquid surface is lowered, and the damper 10 is also lowered toward the bottom of the tank in conjunction therewith. When the damper 10 is lowered, the damper 10 is sequentially folded from the partition member 11 on the tank bottom side, and the damper 10 is stored in a state of being stacked on the tank bottom 1b.
As a result, the damper is housed in a space corresponding to the height (thickness) of the partition member 11 that is folded and overlapped, and no dead space is generated in the tank, and liquid in the tank is possible. It can be used (discharged) as long as possible.

As described above, according to the anti-sloshing damper of the present embodiment, the lower surface of the floating roof 2 so that the upper end of the partition member 11 made of a foldable plate-like member is interlocked with the liquid level at the liquid level in the tank. Since the lower end of the partition member 11 is fixed to the tank bottom 1b, the damper can be moved up and down inside the tank in conjunction with the tank liquid level and deployed.
As a result, the partition member 11 that partitions the inside of the tank is smoothly expanded and folded in conjunction with the liquid level in the tank, and the tank is partitioned into a small space by the partition member 11 that is expanded according to the remaining amount of liquid. Even if an external force such as an earthquake is applied to the tank, the movement of the liquid between the small spaces is restricted, so that the sloshing is effectively suppressed.

Further, in the anti-sloshing damper 10 constituted by the foldable partition member 11, when the remaining liquid amount in the tank decreases, the partition member 11 is folded and folded to the bottom of the tank. All the liquid in the tank can be used (discharged), leaving a space corresponding to the height (thickness).
In addition, the damper 10 can be stored in a space corresponding to the height of the folded state, and there is no useless dead space in the tank, and sloshing can be effectively suppressed while making the most of the tank capacity. It is possible to realize an anti-sloshing damper with high economic efficiency and reliability.

Further, in the present embodiment, the connecting portion between the rigid plate 13 and the connecting member 14 constituting the partition member 11 is connected by a connecting wire, so that the liquid pressure acts on the rigid plate 13 by the reciprocating motion of the liquid. In this case, the folded portion of the rigid plate 13 and the connecting portion of the rigid plate 13 and the connecting member 14 are completely fixed, and the rigid plate 13 and the connecting portion 14 behave as a rigid partition member, and the partition member 11 Can be smoothly unfolded and folded.
In addition, the anti-sloshing damper 10 of the present embodiment can be realized with a low-cost anti-sloshing damper that smoothly expands and contracts in conjunction with the tank liquid level using only a simple member such as a flat plate or H steel. A damper consisting only of a simple member such as a flat plate or H steel can be easily manufactured and assembled. For example, it can be manufactured in accordance with the shape of the manhole on the tank side wall. Simplification is also possible.
In this way, according to the anti-sloshing damper 10 of the present embodiment, the anti-sloshing damper 10 can be arranged in an optimal shape according to the shape and size of the tank, and can be expanded and contracted in the tank. An anti-sloshing damper excellent in versatility and expandability that can be applied to tanks of shape, size, etc. can be provided.

[Second Embodiment]
Next, the anti-sloshing damper according to the second embodiment of the present invention will be described with reference to FIG.
FIG. 5 is an essential part enlarged perspective view showing the anti-sloshing damper 20 according to the second embodiment of the present invention.
As shown in the figure, the anti-sloshing damper 20 according to the present embodiment has substantially the same configuration as the damper 10 of the first embodiment described above, and further includes a levitation member 22 that floats the damper 20 and a damper. 20 and a bottom connecting wire 26 for connecting the tank bottom 1b. Other configurations are the same as those in the first embodiment. In addition, although illustration is abbreviate | omitted about the buffer member (refer FIG. 2) with which a damper upper end side is equipped, the thing similar to the buffer member 12 shown in 1st embodiment can be provided.

Specifically, as shown in FIG. 5, the damper 20 of the present embodiment includes a partition member 21, a levitation member 22, and a bottom coupling wire 26.
The partition member 21 includes a rigid plate 23, a connecting member 24, and a coupling wire 25, as in the first embodiment.
The levitation member 22 is a member that floats in the liquid in the tank, and is attached to the H steel that is the base material of the connecting member 24.
The bottom coupling wire 26 is a wire fixed to each of the tank bottom 1b and the side surface of the connecting member 24, and thereby couples the tank bottom 1b and the partition member 21.

With such a configuration, in the anti-sloshing damper 20 of the present embodiment, the partition member 21 floats by the levitation force of the levitation member 22 provided below the connecting member 24 when immersed in the liquid in the tank. Accordingly, the entire partition member 21 in the folded state comes to float in the liquid. Since the lowest connecting member 24b of the partition member 21 is attached and fixed to the tank bottom 1b (or the base 7), the partition member 21 is different from the first embodiment in that the lowermost rigid member 24b is rigid. It is developed sequentially from the plate 23.
At this time, the bottom coupling wires 26 are set so as to be stretched when the fixed rigid plates 23 are unfolded, and when the rigid plates 23 are unfolded, the tank bottom portion 1b and the connecting member 24 side surface are connected. It will be in the state extended between them (refer FIG. 5).

In this way, the bottom coupling wire 26 is in a stretched state with the rigid plate 23 deployed, the tension of the left and right wires 26 is applied to the partition member 21, and the partition member 21 is restrained from swinging in the left-right direction. And deployed and held in the tank.
Thereby, according to the anti-sloshing damper 20 of the present embodiment, the developed rigid plate 23 is held by the tension of the bottom coupling wire 26, the swing of the partition member 21 is suppressed, and the adjacent dampers and the tank side wall Contact, interference and the like are prevented, and the force applied to the partition member 21 is absorbed by the tank bottom 1b through the bottom connecting wire 26.
Therefore, even if the pressure of the internal fluid is repeatedly applied to the extended damper 20 due to the reciprocating motion of the liquid in the tank due to an earthquake or the like, the damper 20 is formed by the wire stretched between the partition member 21 and the tank bottom 1b. The unfolded state is maintained, and the partition member 21 can be effectively functioned as a sloshing prevention means without being rolled up.

[Third embodiment]
Furthermore, the anti-sloshing damper according to the second embodiment of the present invention will be described with reference to FIGS.
FIG. 6 is an essential part enlarged perspective view showing the anti-sloshing damper 30 according to the third embodiment of the present invention. FIG. 7 is an explanatory view schematically showing the operation of the anti-sloshing damper 30 shown in FIG.
As shown in the figure, the anti-sloshing damper 30 according to the present embodiment has substantially the same configuration as the first and second embodiments described above, and further reinforces the reinforcing posture of the damper 30 when deployed. A support 37 and a folding mechanism 38 are provided. Other configurations are the same as those in the first and second embodiments.
In addition, although illustration is abbreviate | omitted about the buffer member (refer FIG. 2) with which a damper upper end side is equipped, the thing similar to the buffer member 12 shown in 1st embodiment can be provided.

As shown in FIGS. 6 and 7, the reinforcing support column 37 is formed of a columnar member configured to be bendable at the center portion, and a pair of reinforcing support columns 37 installed at both ends between the connecting members 34 positioned above and below is provided. It is provided and the expansion | deployment state of the partition member 31 is reinforced by this.
Specifically, the reinforcing support 37 is rotatably attached to the end of the connecting member 34 whose upper and lower ends are respectively positioned, and is rotated in conjunction with the expansion and folding operations of the damper 30. It is designed to be folded.
In order to smoothly perform the folding operation of the reinforcing column 37, a folding mechanism 38 is provided.

As shown in FIG. 7, the folding mechanism 38 is means for causing the reinforcing column 37 to be folded by a combination of a wire and a roller.
Specifically, as shown in FIG. 7, the folding mechanism 38 includes a protrusion 38a projecting substantially at the center of the lower surface of the upper connection member 34, and a lower-stage connection through which the protrusion 38a is inserted. A hole 38b formed in the member 34 and a folding wire 38e that is pressed and urged by a protrusion 38a inserted through the hole 38b and pulls the reinforcing column 37 in a direction to be folded are provided. In FIG. 7, for convenience of illustration, the protrusion 38a is shown only on the upper connecting member side, and the hole 38b and the folding wire 38e are shown only on the lower connecting member side. The members and rigid plates are similarly provided in all stages of the damper 30 having a plurality of stages.

As shown in FIG. 7, the folding wire 38e is composed of a pair of wires provided corresponding to a pair of reinforcing columns 37 provided at both ends of the connecting member 34, and each of the wires of the connecting member 34 is positioned vertically. They are stretched symmetrically between them.
Specifically, one end of each folding wire 38e is fixed to the central bent portion of the reinforcing support 37, and the other end is a tension roller provided near the upper portion of the other reinforcing support 37 facing the other. It is wound around 38c, passes through the lower surface side of the hole 38b of the upper stage side connecting member 34, and is fixed to an arbitrary location (not shown). For example, the other end of the wire is fixed to the upper portion of the reinforcing column 37 to which one end is fixed.

In addition, a hole roller 38d is provided in the vicinity of the left and right of the hole 38b where the folding wire 38e is disposed and stretched, and the hole 38b is stretched by the protrusion a inserted through the hole 38b. When the folded folding wire 38e is pressed, the wire is stretched through the hole roller 38d and the stretching roller 38c, and the folded portion of the reinforcing column 37 is pulled in the folding direction.
Thus, as shown in FIG. 7 (b), when the upper rigid plate (not shown) is folded, the protrusion 38a is inserted into the hole 38b, and the folding wire 38e is pressed downward. Be energized. Then, the folding wire 38e pulls the bent portion of the reinforcing column 37 via the stretching roller 38c, and the reinforcing column 37 is folded.

According to the anti-sloshing damper 30 of the present embodiment as described above, by providing the reinforcing support 37, the reinforcing support 37 is installed between the connecting members positioned above and below when the damper 30 is expanded, so that the expansion of the damper 30 is achieved. The state can be maintained firmly. And by providing the folding mechanism 38, the folding operation | movement of the reinforcement support | pillar 37 can be performed smoothly, and also by providing the reinforcement support | pillar 37, the expansion | deployment and folding operation | movement of the damper 30 are not impaired.
Such a reinforcing support 37 is particularly suitable when the damper is multi-staged or multi-layered.

In each of the embodiments described above, it is assumed that the anti-sloshing damper 10 is attached to the floating roof 2 provided in the floating roof type tank (see FIG. 1). It may not be attached to the floating roof.
For example, as shown in FIG. 8, the damper 10 shown in the first to third embodiments can be provided with a float 80 that floats on the liquid level in the tank. The float 80 is configured such that a plurality of floats 80 are fixed to the upper end side of the damper 10 at a predetermined interval.

Even in such a configuration, as in the case of being fixed to the floating roof 2 described above, the damper 10 can be expanded and contracted in conjunction with the tank liquid level to effectively function as a sloshing prevention means. And according to the damper 10 provided with the float 80 independent of the floating roof 2 in this way, as shown in FIG. 8, it is a dome type tank provided with a fixed dome 8 as shown in FIG. Even so, the anti-sloshing damper of the present invention can be used.
In this case, since it is not necessary to consider interference between the floating roof 2 and the damper 10, the buffer member 12 shown in the first embodiment can be omitted.

As described above, the anti-sloshing damper of the present invention has been described with reference to the preferred embodiment. However, the anti-sloshing damper according to the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. It goes without saying that implementation is possible.
For example, in the above-described embodiment, a cylindrical tank has been described as an example of a tank to which the anti-sloshing damper according to the present invention is applied. However, the shape of the tank is not limited to the cylindrical shape, but is a square cylindrical shape, a polygonal shape. A cylindrical shape etc. may be sufficient. In such a case, the arrangement shape of the partition members is also formed in a square shape, a polygonal shape or the like according to the tank.

[Example]
Hereinafter, an embodiment of the anti-sloshing damper according to the present invention will be described with reference to FIGS.
In the following example, a simulation damper simulating the anti-sloshing damper shown in each of the above-described embodiments was created under the following conditions, and an experiment was performed with the simulation damper attached to the simulation tank.

[Simulated tank / simulated damper]
As shown in FIG. 9, a cylindrical simulated tank 1A having an inner diameter of 515 mm is prepared, and a simulated damper 10A having the following conditions is installed in the simulated tank 1A, and water is used as a content liquid so that the liquid level is 210 mm. Filled.
The simulated damper 10A is a state in which slits extending in the vertical direction of the panel are formed at predetermined intervals on a resin panel having a width of 514 mm, a height of 205 mm, and a thickness of 5 mm, and the anti-sloshing damper 10 according to the present invention is connected linearly A plate-like damper was created. The slit formed in the panel member simulates a gap (space) between adjacent dampers of the anti-sloshing damper 10 according to the present invention. By changing the setting conditions of this slit, the following Examples 1 to 4 dampers were formed. In Examples 1 to 4, when the slits in 24 rows are defined as an aperture ratio of 100%, Examples 1 and 3 correspond to an aperture ratio of 66%, and Examples 2 and 4 correspond to an aperture ratio of 33%. .
Then, this simulated damper was installed and fixed on the diameter line of the simulated tank, a sine wave having a displacement of ± 1.0 mm was input to the simulated tank 1A to generate sloshing, and the sloshing height η was measured.

[Example 1]
In the simulated damper of Example 1, 12 slits were formed so that one slit had a width of 15 mm × height of 160 mm and was substantially uniform in the horizontal direction of the panel as shown in FIG. Equivalent to an aperture ratio of 66%).
With this panel, dampers corresponding to thirteen rows of anti-sloshing dampers 10 deployed in the vertical direction in the tank were formed, and the simulated dampers were fixed on the diameter line of the simulated tank and were vibrated in the tank.

[Example 2]
The simulated damper of the second embodiment has eight rows of slits having a width of 15 mm and a height of 160 mm which are the same as those of the first embodiment, as shown in FIG. (Corresponding to an aperture ratio of 33%).
By this panel, dampers corresponding to nine rows of anti-sloshing dampers 10 developed in the vertical direction in the tank were formed, and the simulated dampers were fixed on the diameter line of the simulated tank and were vibrated in the tank.

[Example 3]
The simulated damper of Example 3 was replaced with the linear slit of Example 1, and was a round hole that was linearly continuous.
Specifically, nine round holes with a diameter of 15 mm are formed at predetermined intervals in the panel height direction into one row, and this round hole row is substantially even in the horizontal direction of the panel as shown in FIG. Thus, 12 rows were formed (corresponding to an aperture ratio of 66%).
With this panel, a damper corresponding to the anti-sloshing damper 10 arranged so as to have the same aperture ratio as in Example 1 was formed, and this simulated damper was fixed on the diameter line of the simulated tank and was vibrated to the tank.

[Example 4]
In the simulated damper of Example 4, eight rows of φ15 mm × 9 round hole similar to Example 3 were formed so as to be substantially equal in the horizontal direction of the panel as shown in FIG. Equivalent to a rate of 33%).
With this panel, a damper corresponding to the anti-sloshing damper 10 arranged so as to have the same aperture ratio as in Example 2 was formed, and this simulated damper was fixed on the diameter line of the simulated tank and was vibrated to the tank.

The sloshing height generated when the simulated dampers of Examples 1 to 4 were attached and when the dampers were not attached at all was compared. The comparison result is as shown in FIG.
As shown in the figure, first, when the damper was not attached, a large oscillation with a maximum sloshing height of about 40 mm occurred on the tank liquid surface with the excitation frequency of 1.3 Hz peaked.

On the other hand, when each of the simulated dampers of Examples 1 to 4 was attached, the oscillation that peaked at the excitation frequency of 1.2 Hz occurred on the liquid surface, but the maximum sloshing height was All are 10 mm or less, and it turns out that sloshing is suppressed to about 1/4 or less.
In particular, in the dampers of Example 2 and Example 4 (8 rows of slits or round holes), it can be seen that the sloshing height is suppressed to 5 mm or less.
From the above embodiment, it can be seen that the anti-sloshing damper 10 according to the present invention can reliably and effectively prevent the occurrence of sloshing.

  The anti-sloshing damper of the present invention is preferably used as a anti-sloshing damper provided in a floating roof tank, particularly as a anti-sloshing (liquid level fluctuation) generated in a crude oil tank or the like due to an external force such as an earthquake. Can do.

It is a section front view of a tank provided with a sloshing prevention damper concerning a first embodiment of the present invention. It is a principal part expansion perspective view of the anti-sloshing damper which concerns on 1st embodiment of this invention. It is a top view which shows the arrangement | positioning pattern in the tank of the sloshing prevention damper which concerns on 1st embodiment of this invention, (a) is arrange | positioned radially through a frame ring, (b) is also a pentagon shape The case where it arrange | positions is shown. It is a section front view of a tank which shows raising and lowering operation interlocked with the amount of liquid of the sloshing prevention damper concerning a first embodiment of the present invention. It is a principal part expansion perspective view of the anti-sloshing damper which concerns on 2nd embodiment of this invention. It is a principal part expansion perspective view of the anti-sloshing damper which concerns on 3rd embodiment of this invention. It is the schematic which shows the reinforcement support | pillar used for the sloshing prevention damper which concerns on 3rd embodiment of this invention, and a folding mechanism, (a) is a front view, (b) is an operation | movement state figure. It is a section front view of a tank provided with a sloshing prevention damper concerning other embodiments of the present invention. It is a section front view in the state where the simulation damper concerning one example of the present invention was attached to the simulation tank. It is a front view which shows the simulation damper which concerns on one Example of this invention. It is a graph which shows the relationship between the excitation frequency at the time of generating sloshing in the simulation tank of this invention, and sloshing height. It is a cross-sectional front view of a conventional general tank. It is a section front view of the tank which shows the state where sloshing occurred typically.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tank body 2 Floating roof 3 Pontoon 4 Sealing device 5 Guide pole 6 Rolling ladder 7 units 8 Dome 10 Sloshing prevention damper 11 Partition member 12 Buffer member 13 Rigid plate 14 Connecting member 15 Bonding wire 16 Strut 17 Elastic member 18 Thin film member 19 Construction material

Claims (7)

A damper for preventing sloshing disposed in a tank for storing liquid,
A plurality of plate-like members arranged in parallel with the liquid level in the tank are connected in a foldable manner in the tank height direction, and the upper plate-like member is arranged in conjunction with the liquid level in the tank, A plate member at the lower end is fixed to the bottom of the tank, and a partition member that is expanded and folded in the tank height direction in conjunction with the liquid level position in the tank ;
Comprising a buffer member disposed at the upper end of the partition member;
The buffer member includes a support pair in which foldable support columns are arranged to face each other, and an elastic member that connects both bent portions of the support pair, and a lower end of each support column of the support pair is the partition. Attached to the upper end of the member, the upper end of the column is arranged in conjunction with the liquid level in the tank,
In the case where a plurality of the buffer members are disposed at the upper end of the partition member, a space formed by being surrounded by the two adjacent strut pairs, the liquid level in the tank, and the plate member at the upper end of the partition member. An anti-sloshing damper comprising a flexible thin-film member disposed . A damper for preventing sloshing disposed in a tank for storing liquid,
A plurality of plate-like members arranged in parallel with the liquid level in the tank are connected in a foldable manner in the tank height direction, and the upper plate-like member is arranged in conjunction with the liquid level in the tank, A plate member at the lower end is fixed to the bottom in the tank, and includes a partition member that is expanded and folded in the tank height direction in conjunction with the liquid level position in the tank ,
The partition member includes a rigid plate in which two flat plates connected in a foldable manner are opposed to each other, and a connecting member that connects the rigid plate up and down in the tank height direction. A sloshing prevention damper , wherein a plurality of members are connected in the tank height direction . A damper for preventing sloshing disposed in a tank for storing liquid,
A plurality of plate-like members arranged in parallel with the liquid level in the tank are connected in a foldable manner in the tank height direction, and the upper plate-like member is arranged in conjunction with the liquid level in the tank, A plate member at the lower end is fixed to the bottom in the tank, and includes a partition member that is expanded and folded in the tank height direction in conjunction with the liquid level position in the tank,
Wherein during deployment of the partition member, sloshing preventive damper, characterized in that it comprises a wire which is stretched between the partition member and the bottom of the tank deployed. The anti-sloshing damper according to claim 2 , further comprising a wire stretched between connecting members positioned above and below the developed rigid plate when the partition member is deployed. The sloshing prevention according to claim 2 , further comprising a foldable reinforcing column that is laid between connecting members positioned above and below the deployed rigid plate when the partition member is deployed, and is folded when the partition member is folded. Damper. When the tank is a floating roof tank provided with a floating roof that floats on the liquid level in the tank,
The sloshing prevention damper according to any one of claims 1 to 5, wherein an upper end of the partition member is fixed to a lower surface of the floating roof. The sloshing prevention damper according to any one of claims 1 to 6 provided with a levitation member which levitates said partition member in the liquid in a tank.

Images