JPH08198387A - Sloshing preventing device - Google Patents

Abstract

PURPOSE: To effectively suppress sloshing by providing an empty chamber formed from a film material and filled with air to the side wall of a container in a sloshing preventing device preventing sloshing, that is, a phenomenon such that a content liquid is shaken generated by an earthquake or the external force such as shaking at the time of transport. CONSTITUTION: A sloshing preventing device is constituted by filling the empty chamber A formed by a diaphragm member 2 composed of a film material made of rubber having airtightness and the inner surface of the side wall 1a of a liquid storage tank 1 with air. A plurality of the sloshing preventing devices are provided to the inner peripheral surface of the cylindrical liquid storage tank 1 at a predetermined interval. The diaphragm member 2 is reinforced by metal wires and molded into a protruding shape of which the central part is expanded. This diaphragm member 2 is arranged so as to come to the liquid surface from the highest liquid level to the lowest liquid level and the outer peripheral edge thereof is fixed to the inner surface of the side wall 1a airtightly by an engaging member 3 and the diaphragm member 2 is expanded outward by compressed air supplied to the empty chamber A through an air sending pipe 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing sloshing in all types of containers including liquid storage tanks and reaction tanks.

[0002]

2. Description of the Related Art In a container or the like in which a liquid is stored, an external force such as an earthquake or shaking during transportation causes the pressure fluctuation due to growth and separation of bubbles in the liquid.
Sloshing, that is, the phenomenon that the content liquid is shaken, may occur. Since such sloshing causes various inconveniences such as the outflow and alteration of the content liquid in the storage tank and the difficulty in controlling the reaction in the reaction tank, various prevention devices have been conventionally devised.

For example, when the inside of the container is partitioned by a partition wall, the flowable region of the liquid is limited to the small chamber formed by the partition wall, so that a long-period standing wave that causes a large shake is prevented. can do. This technique is still widely used today in tankers and tank trucks.

[0004]

However, the standing wave is
Since it is generated according to the eigenmode (natural frequency) determined by the size of the container, that is, the size of the flowable region of the liquid having a free surface, even if such a partition is provided inside the container, Only the period of the standing wave is shortened, and the standing wave of a short period corresponding to the size of the small chamber partitioned by the partition wall is still generated. Also, in a gas-liquid contact tank in which gas is diffused from the vicinity of the bottom of the tank and brought into contact with the content liquid, if sloshing occurs due to self-excited vibration due to rising motion of bubbles, such a partition wall is used. Even if you provide
Sloshing cannot be subdued unless the operation of the source of self-excited vibration is stopped. Furthermore, the frequency of the external force that periodically acts on the container and the content liquid matches the natural frequency of the container,
That is, it is not possible to prevent the amplitude from being enlarged when resonating.

The present invention has been devised in order to eliminate such disadvantages of the prior art, and its main purpose is to:
An object of the present invention is to provide an anti-sloshing device that suppresses sloshing by inhibiting the formation of eigenmodes that cause the generation of standing waves.

[0006]

According to the present invention, there is provided a sloshing preventing device for preventing sloshing in a container for storing a liquid.
A chamber filled with gas, at least a part of which is flexible and airtight, is arranged on the side wall of the container so that it can come into contact with the liquid surface that moves up and down through the film material. This is achieved by providing an anti-sloshing device characterized by being installed. Particularly, it is preferable that the vacant chamber is formed by the film material whose central portion bulges in a convex shape and the inner surface of the side wall of the container to which the peripheral edge of the film material is adhered. Alternatively, the vacant chamber may be formed of a bag body made of the film material.

[0007]

According to this structure, the sloshing causes the film material to be deformed irregularly, and the boundary between the film material and the liquid surface is displaced irregularly, so that the eigenmode of sloshing is not formed.
That is, since the eigenmode is determined according to the boundary condition of the liquid surface, that is, the reflection condition of the surface wave on the side wall of the container, the boundary can be irregularly displaced in this way.
Since the boundary conditions of the liquid surface are not constant, the formation of eigenmodes is hindered and standing waves are less likely to occur. If a standing wave is not formed in this way, the energy and periodic external force that are the sources of vibrations that are constantly added by self-excited vibrations act to cancel each other out. At the same time, energy is consumed when the vacant chamber contracts due to the deformation of the film material, so sloshing can be effectively suppressed. Similarly, sloshing can be calmed down early even for a transient external force such as an earthquake.

In particular, the vacant chamber is formed by a film material whose central portion bulges in a convex shape and the inner surface of the side wall of the container to which the periphery of the film material is adhered, or a bag-shaped film material. If it is formed in such a manner, a high anti-sloshing effect can be obtained, and since the structure is relatively simple, it can be installed at low cost and maintenance is easy.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in detail below with reference to specific embodiments shown in the accompanying drawings.

Embodiment 1 FIGS. 1 and 2 show a first anti-sloshing device according to the present invention.
Is shown. This anti-sloshing device
Diaphragm body 2 made of airtight rubber film material
A space A formed by the inner surface of the side wall 1a of the liquid storage tank 1 is filled with air, and a plurality of inner spaces of the side wall 1a of the cylindrical liquid storage tank 1 are equally spaced from each other. It is lined up.

The diaphragm body 2 is reinforced by a metal wire or the like, and is formed in a shape in which the central portion bulges in a convex shape. The diaphragm body 2 is arranged so as to cover the liquid surface from the highest liquid level to the lowest liquid level, and the outer peripheral edge thereof is airtightly fixed to the inner surface of the side wall 1a by the locking member 3. The air pressurized by the compressor 4 is introduced into the vacant chamber A by the air supply pipe 5 inserted from the outer surface side of the side wall 1a provided with the diaphragm body 2. The internal pressure of the vacant chamber A at this time is adjusted by increasing or decreasing the introduction amount of the pressurized air according to the liquid level, the specific gravity of the liquid, the expected size of sloshing, and the like.

In such an anti-sloshing device, when sloshing occurs in the liquid storage tank 1,
Due to the shaking of the liquid due to the sloshing, the diaphragm body 2
Is deformed indefinitely, and the vacant chamber A contracts at the same time. Therefore, as described above, since the boundary condition of the liquid surface that influences the formation of the eigenmode of sloshing is not constant,
Since the formation of standing waves is hindered and energy is consumed when the vacant chamber A contracts, sloshing is effectively suppressed.

Embodiment 2 FIG. 3 shows a second embodiment of the anti-sloshing device according to the present invention. This anti-sloshing device is configured to fill air into an empty chamber B inside a bag 11 that is formed into a substantially columnar shape with an airtight rubber film material.
Similar to the first embodiment, a plurality of rows are provided at equal intervals on the inner peripheral surface of the side wall 1a of the liquid storage tank 1.

The bag 11 is fixed to the inner surface of the side wall 1a at least at two upper and lower positions by locking members 12 so as not to sway due to sloshing. Further, the pressurized air from the compressor 4 is introduced from the upper part of the bag 11 into the vacant chamber B via the air supply pipe 13.

In the anti-sloshing device constructed as described above, when sloshing occurs in the liquid storage tank 1, the bag 11 is deformed by the shaking of the liquid and the empty chamber B is contracted, as in the first embodiment. Sloshing is effectively suppressed. Further, as in the first embodiment, the side wall 1a
Since it is not necessary to open a hole into which the air pipe 5 is inserted,
Easy to attach to the liquid storage tank.

In each of the above-mentioned embodiments, the membrane material forming the diaphragm body 2 and the bag 11 is made of rubber, but the present invention is not limited to this, and the chemical characteristics and temperature of the content liquid are not limited thereto. A material suitable for the above may be appropriately selected. Further, the gas filled in the diaphragm body 2 and the bag 11 is not limited to air. For example, when the inner solution is a flammable liquid, an inert gas may be used. .

Further, in each of the above embodiments, the air supply pipe 5
-If an accumulator or the like having an appropriate capacity is connected to 13, the contraction amount of the vacant chambers A and B is increased, and the boundary of the liquid surface can be displaced more greatly, so that the sloshing prevention effect is improved. .

[0018]

As described above, according to the present invention, the sloshing can be calmed down at an early stage against a transient external force such as an earthquake, and at the same time, the sloshing can be effectively performed against a self-excited vibration or a periodical external force. Can be suppressed. Further, in the reaction tank, there is an advantage that the disadvantage that the stirring of the liquid is hindered by the partition wall is eliminated. In particular, in the gas-liquid contact tank, it becomes possible to set deeply the air diffusion position that affects the size of sloshing, so that there is a very remarkable effect in improving the contact efficiency.

Further, if the internal pressures of the vacant chambers A and B can be adjusted as in the above embodiment, there is an advantage that optimal sloshing suppression control corresponding to various situations can be performed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of an anti-sloshing device constructed according to the present invention.

FIG. 2 is a cross-sectional view showing a liquid storage tank equipped with the anti-sloshing device shown in FIG.

FIG. 3 is a longitudinal sectional view showing a second embodiment of the anti-sloshing device constructed according to the present invention.

4 is a top view showing a liquid storage tank equipped with the anti-sloshing device shown in FIG. 2. FIG.

[Explanation of symbols]

 1 Liquid Storage Tank 1a Side Wall 2 Diaphragm Body 3 Locking Member 4 Compressor 5 Air Pipe 11 Bag 12 Locking Member 13 Air Pipe A / B Vacancy

Claims (3)

[Claims] 1. An anti-sloshing device for preventing sloshing in a container for storing a liquid, which is a chamber filled with gas and at least part of which is formed of a flexible and airtight film material. Is disposed on the side wall of the container so as to be able to come into contact with the liquid surface that moves up and down through the film material. 2. The vacant chamber is formed by the film material whose central portion bulges in a convex shape and the inner surface of the side wall of the container to which the peripheral edge of the film material is adhered. The anti-sloshing device according to 1. 3. The anti-sloshing device according to claim 1, wherein the empty chamber comprises a bag body formed of the film material.