KR20170083516A - Storage container for magneto-rheological fluid - Google Patents

Abstract

1. A magnetorheic fluid storage device comprising a container for storing a magnetorheological fluid by forming a receiving space therein to prevent separation of magnetic particles and a dispersion medium during storage, transportation or storage of the magnetorheological fluid And at least one magnetic bearing provided on at least one side of the container for applying a magnetic field to the magnetorheological fluid inside the container.

Description

{STORAGE CONTAINER FOR MAGNETO-RHEOLOGICAL FLUID}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for storing fluid, and more particularly to a magnetorheological fluid storage device for storing magnetorheological fluid.

Generally, a magneto-rheological fluid is a suspension in which magnetic particles are dispersed in a nonmagnetic solvent as a dispersion medium. The magneto-rheological fluid has a rheological behavior depending on the magnitude of an external magnetic field And a fluid exhibiting a magnetorheological phenomenon in which electrical, thermal, and mechanical physical properties are different.

The magnetorheological fluids are magnetic particles such as iron, carbonyl iron, iron alloy, iron oxide, nickel, cobalt and low carbon steel. Mineral oil, silicone oil, castor oil, paraffin oil and hydrocarbon oil are used as the dispersion medium. do. In addition, an additive such as organic clay or a surfactant is mixed with a solvent to prepare a magnetorheological fluid.

The magnetorheological fluid is used in various industrial fields such as a clutch and a damper of an automobile, and the produced magnetorheological fluid is put in a container and supplied to a desired consumer.

However, when the magnetorheological fluid is left for a long time, the magnetic particles are separated from the dispersion medium due to the difference in density between the dispersion medium and the magnetic particles, which constitute the magnetorheological fluid, in the container.

In order to use the magnetorheological fluid, the consumer has inconvenience of re-mixing or redispersing the separated magnetic particles and the dispersion medium in the container.

Magneto-rheological fluids contain heavy magnetic particles such as iron. Even if the container is small, it is too heavy to mix the particles evenly by shaking the container. Moreover, in the case where a large amount of magnetorheological fluid is used, delivery is made using a large container such as a drum. It is almost impossible to shake a large container, and it takes a lot of time and effort to stir the fluid in the container.

Accordingly, there is provided a magnetorheic fluid storage device capable of preventing separation of magnetic particles and a dispersion medium during storage, transportation, or storage of the magnetorheological fluid.

This embodiment is a magnetorheological fluid storage device including a container for storing a magnetorheological fluid by forming an accommodation space therein, the magnetorheological fluid storage device comprising: at least one side of the container, at least one side of which is magnetized with magnetorheological fluid inside the container; Or more of magnetic books.

This embodiment is a magnetorheological fluid storage device comprising a container for storing a magnetorheological fluid by forming a receiving space therein, the magnetorheological fluid storage device comprising: at least one side of the container, Or more of magnetic books.

This embodiment is a magnetorheological fluid storage apparatus including a container for storing a magnetorheological fluid by forming a receiving space therein, the magnetorheological fluid storage apparatus comprising: at least one side of the container, And at least one magnetic book formed at an upper portion thereof.

The magnetic field portion may be installed at the bottom of the container.

The magnetic field portion may be detachably installed in the container.

The storage device may further include a detachable portion for mounting the magnetic tape to the container.

The detachable portion may include a coupling groove formed outside the bottom of the container and extending to the side of the container, and a drawer member slidably inserted into the coupling groove, and coupled to the bottom of the container and having at least one stepped groove,

The detachable portion may include a fastening member protruding along the outer circumferential surface of the container, and a lower end member detachably fitted to the fastening member and having at least one stepped groove in which a magnetic field is placed.

A male screw may be formed on the outer circumferential surface of the fastening member and a female screw may be formed on the inner circumferential surface of the lower end member so as to be screwed to the fastening member.

The magnetic field portion may be a permanent magnet.

The magnetic field portion may be an electromagnet.

The magnetic field portion may have a structure that applies a magnetic field to the magnetorheological fluid from the bottom of the container toward the top thereof to one fifth point or more of the container.

The electromagnet is disposed in the case. The electromagnet is electrically connected to the electromagnet. The electromagnet is connected to the electromagnet. The electromagnet is connected to the electromagnet to switch the power supply on and off. . ≪ / RTI >

Wherein the magnetic field portion further comprises a power supply terminal provided at a drawer member or a lower end member of the detachable portion to supply external power to the battery portion, and at a position corresponding to the inner circumferential surface of the stepped groove of the outer surface of the case, A pair of electrical contacts for connecting the power supply terminal and the power supply terminal may be provided and the power supply terminal may be electrically connected to the power supply unit when the case is inserted into the detachment unit stepped groove.

The battery unit may be a rechargeable secondary battery.

The switch is installed in a drawer member or a lower end member of the detachable portion and is exposed to the outside. A pair of electrical contacts for connecting the switch and the battery portion are provided at positions corresponding to the inner circumferential surface of the stepped groove of the outer surface of the case and the stepped groove, When the case is inserted into the depressed portion stepped groove, the battery may be electrically connected to the switch.

The container may comprise a steel drum, and the magnetic field portion may include a coil wound around an outer circumferential surface of the drum, and a power source for applying power to the coil.

As described above, according to this embodiment, separation phenomenon between the magnetic particles and the dispersion medium can be prevented or remarkably reduced when the magnetorheological fluid is transported or stored for a long period of time.

In addition, the magnetorheological fluid contained in the container can be directly used without re-mixing or redispersing the magnetorheological fluid.

Further, there is an advantage that the storage and use of the magnetorheological fluid is more convenient by using the container of this embodiment.

1 is a partial cross-sectional view showing a first embodiment of a magnetorheic fluid storage device according to the present invention.
2 is a schematic view showing a configuration of a magnetorheic fluid storage device according to a first embodiment of the present invention.
3 is a partial cross-sectional view showing a second embodiment of the magnetorheic fluid storage device according to the present invention.
4 is a schematic view showing the configuration of a magnetorheic fluid storage apparatus according to a second embodiment of the present invention.
FIG. 5 is a schematic view showing the magnetic book structure of the magnetorheic fluid storage device according to the present invention. FIG.
FIG. 6 is a schematic view showing a configuration of a magnetorheic fluid storage apparatus according to a third embodiment of the present invention. FIG.
7 is a schematic view showing a magnetic particle arrangement state of a magnetorheic fluid by a magnetorheological fluid storage device according to the present invention.
8 is a graph showing sedimentation stability of the magnetorheological fluid storage device of this embodiment in comparison with the prior art.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

Figures 1 and 2 show a first embodiment of a magnetorheological fluid storage device.

The storage device 10 of the present embodiment includes a container 20 for storing a magnetorheological fluid and a magnetic field 30 for preventing magnetic particles from sinking by applying a magnetic field to the magnetorheological fluid contained in the container 20 .

Hereinafter, in this embodiment, a magnetorheological fluid in which magnetic particles are dispersed in a nonmagnetic solvent will be described as an example for storing the magnetorheological fluid. The present invention is not limited to this and is applicable to all fluids which contain magnetic particles and in which sedimentation occurs due to density difference.

The magnetorheological fluid is a magnetic particle suspension whose viscosity varies greatly with the intensity of the external magnetic field. Magneto-rheological fluid is produced by dispersing magnetic particles in a dispersion medium and is a fluid whose physical properties change depending on the intensity of a magnetic field applied from the outside.

Thus, when the magnetic field 30 of the present embodiment applies a magnetic field to the container 20, the magnetorheological fluid contained in the container 20 is magnetized by the magnetic field generated by the magnetic field 30, The physical properties are changed in a similar manner to that of the solid phase, thereby preventing sedimentation.

As shown in FIG. 1, the container 20 may have a structure in which an entrance is formed at an upper end and a receiving space is provided therein. The container 20 is not particularly limited as long as it is capable of receiving and storing the magnetorheological fluid, and various shapes and sizes are applicable. In addition, the container 20 is applicable to any material that can be applied to the magnetorheological fluid passing through the magnetic field from the outside. For example, the container 20 may be made of plastic or steel.

The magnetic field (30) is for applying a magnetic field to the magnetorheological fluid accommodated in the container (20), and may be made of a permanent magnet.

Also, the magnetic field unit 30 may be an electromagnet which generates a magnetic field by supplying power. The magnetic device 30 will be described later in detail.

The magnetic field (30) is installed on one side of the container (20). In this embodiment, the magnetic shelves 30 may be installed at the bottom 22 of the container 20. At least one or more of the magnetic storage units 30 may be installed at various positions on the bottom, side, or the like depending on the shape and size of the container 20.

The magnetic device 30 may be semi-permanently installed in the container 20, and may be detachably attached to the container 20. When the magnet holder 30 is detachably attached to the container 20, the magnetic susceptor 30 can be replaced or the magnetic field intensity can be varied variously according to the desired conditions, if necessary.

To this end, the storage device of the present embodiment may further include a detachable portion for mounting the magnetic storage device 30 to the container 20. [

2, the detachable portion is formed outside the bottom 22 of the container 20 and has a locking groove 40 extending to the side of the container 20, And a drawer member 42 coupled to the bottom 22 of the container 20 and having a stepped groove 44 in which the magnetic strip 30 is placed.

The fastening groove 40 may be formed toward the center of the bottom of the container 20. The drawer member 42 is coupled to the bottom 22 of the container 20 by sliding parallel to the bottom 22 of the container 20 along the fastening groove 40. The drawer member (42) has a shape and size corresponding to that of the coupling groove (40). The drawer member 42 is fitted in the engaging groove 40 so that the outer surface can form the side surface of the container 20.

A flange 46 protrudes outward from the upper end of the drawer member 42 so that the drawer member 42 does not come off from the coupling groove 40. The flange 46 is inserted into the coupling groove 40, The stepped portion 48 is formed at a position corresponding to the stepped portion. Thus, the drawer member 42 slides along the engaging groove 40 in a state where the flange 46 is fitted in the step 48. Thus, the drawer member 42 is configured such that the flange 46 is engaged in the step 48 and the drawer member 42 is not separated from the engaging groove 40 when the container 20 is lifted, for example, And keeps attached to the container 20.

A plurality of stepped grooves 44 are formed on the upper surface of the drawer member 42 so that the magnetic strips 30 can be placed and fixed. The stepped grooves 44 may be arranged at regular intervals to evenly apply a magnetic field to the entire bottom surface of the container 20. In addition to the above structure, one stepped groove may be formed in the drawer member. In such a structure, the stepped groove is formed to have a size substantially corresponding to the bottom of the container, and the magnetic ledge is formed to have a size corresponding to the size of the stepped groove, so that a magnetic field can be applied to the entire bottom of the container.

If the magnetic storage unit 30 is fixed to the stepped groove 44 of the drawer member 42 and the drawer member 42 is inserted into the engaging groove 40, 22 and the magnetic field can be applied to the inside of the container 20. [

Figs. 3 and 4 show another embodiment of a detachable portion for mounting a magnetic book in a container.

3 and 4, in the present embodiment, the detachable portion includes a fastening member 50 protruding along the outer circumferential surface of the bottom 22 of the container 20, and a fastening member 50 detachably fitted to the fastening member 50 And a lower end member 52 having a stepped groove 44 in which the magnetic circuit 30 is placed.

The fastening member 50 may be formed in a ring shape along the bottom 22 of the container 20. The bottom member 52 is formed in a shape and size corresponding to the fastening member 50 so as to be fitted to the fastening member 50. The lower member 52 is coupled to the fastening member 50 to form the lower portion of the container 20.

In this embodiment, the fastening member 50 may have a male screw on the outer circumferential surface, and the lower member 52 may be formed on the inner circumferential surface of the fastening member 50 and screwed to the fastening member 50. In addition to the above-described structure, the fastening member 50 and the lower end member 52 may be coupled using other coupling methods, for example, a forced fit type.

A plurality of stepped grooves 54 are formed on the upper surface of the lower member 52 so that the magnetic recording sheets 30 can be placed and fixed. The stepped grooves 54 may be arranged at regular intervals on the upper surface of the lower member so as to apply a magnetic field uniformly to the entire bottom surface of the container 20. In addition to the above structure, one stepped groove may be formed in the lower member. In such a structure, the stepped groove is formed to have a size substantially corresponding to the bottom of the container, and the magnetic ledge is formed to have a size corresponding to the size of the stepped groove, so that a magnetic field can be applied to the entire bottom of the container.

When the magnetic head 30 is fixed to the stepped groove 54 of the lower member 52 and the lower end member 52 is fitted into the engaging groove 40, So that a magnetic field can be applied to the inside of the container 20.

As mentioned above, in the present embodiment, the magnetic shelf 30 may be made of a permanent magnet or an electromagnet. In the case of a structure in which the magnetic circuit 30 is made of a permanent magnet, the shape of the permanent magnet is made to match the stepped grooves 44 and 54 of the attaching / detaching part, or the stepped grooves 44 and 54 of the attaching / can do.

The magnetic field intensity of the magnetic field 30 can be set differently depending on the size of the container 20 and the kind of magnetorheological fluid. The entire magnetorheological fluid can be solidified by maximizing the intensity of the magnetic field. When the magnetic field strength is large, a magnetic field is transmitted from the bottom of the container 20 to the top of the container 20, and a magnetic field can be applied to the entire magnetorheological fluid filled in the container 20. When the magnetic field intensity is small, magnetic field is applied only to the magnetorheological fluid at the bottom of the container 20. Even when the intensity of the magnetic field is reduced, the height of the sedimentation layer is formed not at the bottom of the vessel but at the height above the vessel, so that redispersion can be performed more easily.

Through repetitive experiments, it was confirmed that the magnetic field 30 can easily remultuate the magnetorheological fluid when the magnetic field has an intensity to be applied up to the fifth point from the bottom of the container 20 to the top . Accordingly, in this embodiment, the magnetic field 30 may be a structure that applies a magnetic field to magnetorheological fluid at least one fifth point or more of the vessel 20 from the bottom to the top. When the magnetic field strength of the magnetic field 30 is less than 1/5 of the height of the container 20, the intensity of the magnetic field applied to the magnetorheological fluid is small, so that the magnetic particles settle down from above, The fluid must be remarried and the large amount of magnetorheological fluid must be remarried, making the operation difficult and difficult.

Fig. 5 schematically shows the structure of the magnetic circuit 30 when it is an electromagnet.

5, the magnetic circuit unit 30 of the present embodiment has a case 32 which is formed in an outer shape and is fitted in the stepped groove 44 of the attaching / detaching unit, an electromagnet 34 installed in the case 32, A battery unit 36 electrically connected to the electromagnet 34 to supply power to the electromagnet 34 and a switch 38 connected to the battery unit 36 to turn on and off the power supply.

The case 32 is for fixing the electromagnet 34 and the electromagnet 34 to the electromagnet 34. The case 32 has a shape and a size corresponding to the stepped grooves 44 and 54 of the attaching / The electromagnet 34 and the electrification unit 36 may be detachably coupled to the case 32. [ Therefore, the electromagnet 34 and the electrification unit 36 can be replaced and used in the case 32, if necessary.

The electromagnet 34 is supplied with electric power from the electric power unit 36, and a magnetic field is formed while a current flows.

In the present embodiment, the battery unit 36 may be provided in the case 32 to supply power stored in the case 32 to the electromagnet 34. For example, the battery unit 36 may be a primary battery capable of discharging only, or a secondary battery capable of charging and discharging. When the battery unit 36 is formed of a secondary battery, power can be supplied from the outside to the battery unit 36 to charge the secondary battery, thereby enabling the battery unit 36 to be continuously used without replacing the battery unit 36.

In addition, the battery unit 36 may be configured to supply power to the electromagnet 34 by receiving power from the outside. To this end, the apparatus may further include a power supply terminal 60 for supplying external power to the battery unit 36 on the outer surface of the drawer member 42 of the detachable unit or on the outer surface of the lower member 52. If an external power source is connected to the power supply terminal 60 from the outside of the container 20 when necessary, the power is supplied to the battery unit 36 through the power supply terminal 60, And supplies the supplied power to the electromagnet 34 to drive the electromagnet 34. When the battery unit 36 is a secondary battery, the secondary battery can be charged through the power supply terminal 60.

5, the electrical connection between the outer surface of the case 32 and the stepped groove (not shown) of the attaching / detaching portion is provided for electrical connection between the battery unit 36 provided in the case 32 and the power supply terminal 60 provided at the attaching / A pair of electrical contacts 62 and 64 for connecting the battery unit 36 and the power supply terminal 60 are provided at positions corresponding to the inner circumferential surfaces of the battery cells 44 and 54, respectively. When the case 32 is inserted into the detachment step grooves 44 and 54, the electrical contacts 62 and 64 are in contact with each other, and the electrical charge section 36 and the power supply terminal 60 are electrically connected.

The switch 38 is installed on the outer surface of the drawer member 42 of the attaching / detaching unit or on the outer surface of the lower member 52 and is exposed to the outside. Thus, when necessary, the operator can easily operate the switch 38 outside the container 20 to control the magnetic storage device 30.

5, the outer surface of the case 32 and the stepped grooves 44, 44 of the attaching / detaching portion are provided for electrical connection between the battery 36 provided in the case 32 and the switch 38 provided at the attaching / A pair of electrical contacts 66 and 68 for connecting the battery 36 and the switch 38 are provided at positions corresponding to each other on the inner circumferential surface of the base plate 54. Thus, when the case 32 is inserted into the depressed portion stepped grooves 44 and 54, the electrical contacts 66 and 68 are brought into contact with each other, and the electrical charge portion 36 and the switch 38 are electrically connected.

Figure 6 shows another embodiment of a magnetorheological fluid storage device.

As shown in FIG. 6, the storage device 10 of the present embodiment includes a drum 70 for storing magnetorheological fluid, a magnetic drum 70 for applying magnetic force to the magnetorheological fluid contained in the drum, The magnetic field portion includes a coil 72 wound around an outer circumferential surface of the drum 70 and a power supply portion 74 for applying power to the coil 72. [

When electric current is supplied to the coil 72, the drum is electro-magnetized to generate a magnetic field, and a magnetic field can be applied to the magnetorheological fluid therein.

The coil 72 may be wound from the lower end to the upper end of the drum 70. The coil 72 may be wound around the entire drum 70 or wound around only a part of the drum 70.

The power source unit receives a power from the outside or applies a current necessary for the coil 72 through a battery provided in the power source unit itself.

Hereinafter, the operation of the apparatus will be described. In the following description, a structure in which the electromagnet 34 is provided in the magnetic circuit 30 will be described as an example. The structure in which the permanent magnet is provided on the magnetic circuit 30 also has the same effect on the operation.

The magnetorheological fluid contained in the container 20 is disorderly distributed within the dispersion medium when the magnetic field is not applied.

In this state, when a current is applied to the electromagnet 34 of the magnetic recording unit 30 provided in the container 20, a magnetic field is formed and a magnetic field is applied to the magnetic recording medium filled in the container 20. Accordingly, as shown in FIG. 7, the magnetic particles of the magnetorheological fluid are aligned in the direction of the magnetic field, while the magnetic particles of the magnetorheological fluid are disordered and the chains are microstructured by the interaction between the magnetized particles.

The magnetorheological fluid keeps the magnetic particles arranged in a state where the magnetic field is continuously applied to the inside of the container 20. [

Therefore, the magnetorheological fluid contained in the container 20 of the present embodiment is prevented from being separated from the dispersion medium because the magnetic particles do not sink to the bottom of the container 20. Thus, the magnetorheological fluid can be stored in the container 20 for a long time without being separated, or can be used as it is without being re-mixed during use.

When the drawer member 42 or the lower member 52 installed in the container 20 is separated from the container 20 for use of the magnetorheological fluid accommodated in the container 20, the magnetorheological fluid immediately mixes. The drawer member 42 and the lower member 52 are separated from the container 20 so that the container 20 is spaced apart from the magnet holder 30 so that no magnetic field is applied to the magnetorheological fluid inside the container 20. As a result, the magnetic particles of the magnetorheological fluid kept in a state of being arranged by the magnetic field are released and dispersed freely in the dispersion medium to be mixed. So that the magnetorheological fluid can be used directly without any further re-mixing process for the magnetorheological fluid in the vessel 20. [

8 is a graph showing the sedimentation stability of the storage device of this embodiment compared with the prior art.

8, the embodiment is a storage device having a structure in which a magnetic field is applied to a container as mentioned above, and a comparative example is a conventional storage device that does not apply a magnetic field.

The experiment was carried out as follows. First, a container of the embodiment having the same shape and size and a container of the comparative example were prepared, and the containers were filled with the same magnetorheological fluid at the same time. Each container was left in a horizontal position and the degree of sedimentation of the magnetorheological fluid was measured at each set time. The initial state where sedimentation did not occur was taken as 100%, and the sedimentation stability was measured by measuring the degree of sedimentation at intervals of 12 hours.

The sedimentation stability was calculated as (100 - (supernatant volume / total magnetorheological fluid volume) * 100,%). Here, the supernatant refers to a layer of the uppermost layer separated by sedimentation of magnetic particles in a magnetorheological fluid.

As a result of the experiment, as shown in the graph of FIG. 8, in the comparative example, sedimentation occurs in the magnetorheological fluid over time and the sedimentation stability deteriorates. On the other hand, in the case of this embodiment, it is confirmed that sedimentation of the magnetorheic fluid does not occur even if the time elapses .

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of course.

10: storage device 20: container
22: bottom 30: magnetic book
32: Case 34: Electromagnet
36: Whole-body part 38: Switch
40: fastening groove 42: drawer member
44: stepped groove 46: flange
48: step 50: fastening member
52: lower end member 54: stepped groove
60: power supply terminal 62, 64, 66, 68: electrical contact

Claims (14)

1. A magnetorheological fluid storage device comprising a container for storing a magnetorheological fluid by forming a receiving space therein,
And at least one magnetic bearing installed on at least one side of the vessel to prevent magnetic particle sedimentation of the magnetorheological fluid. 1. A magnetorheological fluid storage device comprising a container for storing a magnetorheological fluid by forming a receiving space therein,
And at least one magnetic bearing installed on at least one side of the vessel to form a magnetic particle sedimentation layer of magnetorheological fluid spaced apart from the bottom of the vessel. The method according to claim 1,
Wherein the magnetic field portion is installed at the bottom of the container. The method according to claim 1,
Wherein the storage device further comprises a detachable portion for mounting the magnetic tape to the container. 5. The method of claim 4,
Wherein the detachable portion includes a drawer member formed outside the bottom of the container and extending to the side of the container, a drawer member slidably inserted into the engaging groove and coupled to the bottom of the container and having at least one stepped groove, Device. 5. The method of claim 4,
Wherein the detachable portion includes a fastening member protruding along an outer circumferential surface of the container, and a lower end portion formed by being detachably fitted to the fastening member and having at least one stepped groove in which a magnetic field is placed. The method according to claim 6,
Wherein a male screw is formed on an outer circumferential surface of the fastening member and a female screw is formed on an inner circumferential surface of the lower end member and screwed to the fastening member. 8. The method according to any one of claims 1 to 7,
Wherein the magnetic field portion is a permanent magnet. 8. The method according to any one of claims 1 to 7,
Wherein the magnetic field portion is an electromagnet. 10. The method of claim 9,
Wherein the magnetic field portion has an outer shape and is fitted in a stepped groove of the attaching / detaching portion, an electromagnet provided in the case, a power source electrically connected to the electromagnet to supply power, and a switch Wherein the magnetorheological fluid storage device comprises: 11. The method of claim 10,
The switch is installed on a drawer member or a lower member of the detachable portion and is exposed to the outside,
A pair of electrical contacts for connecting the switch and the battery unit are provided at positions corresponding to the outer surface of the case and the inner surface of the stepped groove of the attaching / detaching unit. When the case is inserted into the detachment unit stepped groove, the battery and the switch are electrically connected Structure of magnetorheological fluid storage device. 12. The method of claim 11,
Wherein the magnetic field unit further comprises a power supply terminal installed at a drawer member or a lower member of the detachable unit to supply external power to the battery unit,
A pair of electrical contacts for connecting the battery and the power supply terminal are provided at positions corresponding to the outer surface of the case and the inner surface of the stepped groove of the attaching / detaching unit. When the case is inserted into the attaching / The magnetostrictive fluid storage device having a structure in which the magnetostrictive element is electrically connected. 13. The method of claim 12,
Wherein the battery unit is a rechargeable secondary battery. 10. The method of claim 9,
Wherein the container comprises a steel drum, and the magnetic field portion includes a coil wound around an outer circumferential surface of the drum, and a power source for applying power to the coil.

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