JP2007136443A - Agitating bar and agitation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an agitating bar by which even a sample having high viscosity can be agitated satisfactorily and to provide an agitation apparatus. <P>SOLUTION: The agitating bar 1, which is rotated for agitating the liquid sample b housed in a vessel 60, is provided with: a horizontally rotatable bar-shaped body 10; and agitation magnets 5a, 5b to be disposed on the bar-shaped body 10 so that the magnetizing direction of each of agitation magnets is made parallel to the axis of rotation of the bar-shaped body 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a stirrer and a stirrer for stirring a liquid sample accommodated in a container.

  2. Description of the Related Art Conventionally, as a device for stirring a liquid sample stored in a container, a stirring bar that stirs a sample by receiving a rotating magnetic force and rotating is generally known (for example, the prior art in Patent Document 1). reference).

As shown in FIG. 3, such a stirrer 106 is formed by coating rod-shaped magnets 105 having different magnetism at both ends in the longitudinal direction with plastic, and on the bottom surface of a container 102 containing a liquid sample 103. The sample 103 is submerged and rotated by the rotation of the magnetic body 107 of the magnetic stirrer 108 installed below the container 102 to stir the sample 103.
JP-A-3-232524

  However, in the conventional stirrer 106, the magnetizing direction of the magnet 105 coincides with the longitudinal direction, and this magnetizing direction is orthogonal to the magnetizing direction of the magnet body 107 of the magnetic stirrer 108, so that There was a problem that the attractive force acting was weakened and the rotational force of the magnetic stirrer 108 could not be sufficiently transmitted to the stirrer 106. In particular, when the sample 103 has a high viscosity, this problem is remarkable.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a stirrer and a stirrer that can satisfactorily stir a high-viscosity sample.

  The object of the present invention is a stirrer that stirs a liquid sample contained in a container by rotation, wherein the stirrer can be rotated horizontally, and the magnetization direction is parallel to the rotation axis of the stirrer rotating body. This is achieved by a stirrer provided with a stirring magnet disposed on the stirring rotating body.

  Moreover, it is preferable that the said rotating body for stirring is a rod-shaped body, and a pair of said magnets for stirring are each arrange | positioned at the both ends of the longitudinal direction of the said rod-shaped body.

  Moreover, it is preferable that each said stirring element is further provided with the stirring means rotated integrally with the said rotary body for stirring.

  Moreover, it is preferable that the stirring means is provided so as to generate a vertical stirring flow in the sample during rotation.

  Further, the stirring means includes a support body extending along the rotation axis of the stirring rotating body, and a stirring blade attached to the support body, and the stirring blade is disposed in the axial direction of the support body. It is preferable that it inclines with respect to it.

  Moreover, it is preferable that the said support body equips the front-end | tip part with a holding part.

  Moreover, it is preferable that the said stirring blade is attached in multiple steps along the axial direction of the said support body.

  Moreover, it is preferable that the said stirring blade is attached to the said support body so that attachment or detachment is possible.

  Moreover, in each said stirring element, it is preferable in the rotation center of the said rotating body for stirring to be provided with the support protrusion which protrudes in the side which contacts a container.

  Moreover, it is preferable that the end part of the said stirring rotary body is provided with a plurality of stabilization protrusions having a height lower than that of the support protrusion on the side in contact with the container.

  A plurality of the agitation magnets are arranged at equal intervals along a circumference centered on the rotation axis of the agitation rotor, and all the same poles of the concentric circles are oriented in the same direction. It is preferable to arrange | position.

  The object of the present invention is a stirrer comprising any one of the above stirrers, and a rotating magnetic field generating means for generating a rotating magnetic field so that the stirrer rotates in a state of being accommodated in a container. The rotating magnetic field generating means is disposed on the driving rotating body corresponding to the stirring magnet and a rotating driving means for rotating the driving rotating body, and a stirring magnet. A magnet for driving, the magnet for driving is arranged so that the magnetization direction is parallel to the rotation axis of the rotating body for driving, and magnetic poles different from the corresponding magnet for stirring can be opposed to each other Is achieved by means of an agitator arranged to be

  Moreover, it is preferable that the said drive rotary body is supported so that raising / lowering is possible along a rotating shaft.

  According to the stirrer and the stirring device of the present invention, even a highly viscous sample can be well stirred.

  Hereinafter, actual forms of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view of a stirrer including a stirrer 1 and a magnetic stirrer 40 according to an embodiment of the present invention, and FIG. 2 is a plan view of the stirrer 1.

  As shown in FIGS. 1 and 2, the stirrer 1 includes a rod-shaped body 10, a pair of stirring magnets 5 a and 5 b provided on the rod-shaped body 10, and stirring means provided at the center of the rod-shaped body 10. 2 is provided. The stirrer 1 is disposed in a container 60 such as a beaker in which the liquid sample b is accommodated, and the container 60 is placed on the upper surface of the magnetic stirrer 40.

  The rod-like body 10 and the stirring means 2 are made of, for example, a plastic having a low coefficient of friction with respect to the container 60 and having excellent chemical resistance and wear resistance, such as fluororesin and polypropylene.

  The rod-like body 10 is a rod-like member having circular portions at both ends of a rectangular portion in plan view, and magnet accommodating portions 15a and 15b in which a pair of stirring magnets 5a and 5b are respectively accommodated by the circular portions at both ends. Is formed. At the rotation center of the rod-shaped body 10, a conical support protrusion 21 that protrudes to the side in contact with the container 60 is provided. The magnet housing portions 15a and 15b are provided with a pair of stabilizing projections 23a and 23b, each having an arc shape, on the side in contact with the container 60 and having a height lower than that of the support projection 21. The support protrusion 21 and the stabilization protrusions 23 a and 23 b are formed of the same material as the rod-shaped body 10.

  Each of the stirring magnets 5 a and 5 b is arranged so that the magnetization direction is orthogonal to the longitudinal direction of the rod-shaped body 10. That is, as shown in FIG. 1, in a state where the stirrer 1 is disposed with the support protrusion 21 of the rod-shaped body 10 and the bottom surface of the container 60 in contact with each other, one magnetic pole (for example, N pole) is the top surface of the rod-shaped body 10. The other magnetic pole (for example, S pole) is disposed on the lower surface side of the rod-shaped body 10. The pair of stirring magnets 5a and 5b are arranged so that the magnetization directions are opposite to each other. That is, in the state where the stirrer 1 is disposed in the same manner as described above, when the south pole of one stirring magnet 5a (left stirring magnet in FIG. 1) is disposed on the lower surface side, the other stirring An N pole is arranged on the lower surface side of the magnet 5b (the stirring magnet on the right side in FIG. 1).

  The stirring means 2 includes a support body 11 extending along the rotation axis of the rod-shaped body 10 and a pair of stirring blades 3 attached to the support body 11, and the stirring blade 3 moves vertically with respect to the sample b during rotation. It is inclined at a predetermined angle with respect to the axial direction of the support 11 so as to generate a stirring flow. Moreover, the support body 11 is provided with a gripping portion 35 at the tip, and is configured to be gripped with a finger.

  The magnetic stirrer 40 includes a main body 41 whose top surface is horizontal and a magnetic field generation unit 42 disposed inside the main body 41. The magnetic field generation unit 42 includes a plate-like driving rotator 43 extending in the horizontal direction, and a shaft portion 44 extending in the vertical direction is provided at the center of the driving rotator 43. The driving rotating body 43 is supported so as to be rotatable on a horizontal plane by connecting the lower end portion of the shaft portion 44 to a motor 45 installed on the bottom surface of the main body 41. Further, a pair of drive magnets 46a and 46b are respectively attached to the upper surfaces of both end portions of the drive rotator 43, and the magnetizing directions of these drive magnets 46a and 46b are opposite to each other. Is arranged. In the present embodiment, as shown in FIG. 1, the driving magnet 46a at the left end of the driving rotating body 43 has the north pole facing upward, while the driving magnet 46b at the right end has the south pole facing upward. ing.

  Next, a method for stirring the sample b using the stirring bar 1 configured as described above will be described.

  First, the container 60 containing the sample b is placed on the upper surface of the magnetic stirrer 40, and the stirring bar 1 is submerged in the container 60. At this time, the stirrer 1 is sunk so that the support protrusion 21 of the rod-shaped body 10 contacts the bottom surface of the container 60 and the support 11 stands in the container 60.

  Next, the switch of the magnetic stirrer 40 is turned on to drive the motor 45. Due to the rotation of the motor 45, the driving rotator 43 rotates with the driving magnets 46 a and 46 b around the shaft portion 44, and a rotating magnetic field is generated below the stirrer 1. As the stirring magnets 5a and 5b are attracted to the rotating magnetic field, the rod-shaped body 10 rotates counterclockwise (in the direction indicated by the arrow P) in the container 60 in a plan view. In this way, the stirring means 2 rotates integrally with the rod-shaped body 10, and the stirring blade 3 stirs the sample b in the container 60. Further, when the stirring blade 3 rotates in the direction indicated by the arrow P, an upward flow (see arrow T) occurs in the sample b.

  At this time, the magnetization direction of the stirring magnets 5a and 5b is orthogonal to the longitudinal direction of the rod-shaped body 10, and this magnetization direction is parallel to the magnetization direction of the drive magnets 46a and 46b of the magnetic stirrer 40. Therefore, the ends of the magnets having a high magnetic flux density face each other. As a result, the attractive force acting between the magnets is increased, and the rotational force of the magnetic stirrer 40 can be transmitted to the rod-like body 10 satisfactorily, so that the stirrer 1 rotates smoothly and is a highly viscous sample b. However, it can be stirred well.

  Further, since the stirring blade 3 rotates integrally with the rod-shaped body 10, not only the sample b near the bottom surface in the container 60 but also a sample b near the liquid surface above it is given a large rotational force. Sample b can be stirred well.

  Further, since the stirring blade 3 is inclined with respect to the axial direction of the support 11 and rotates based on the rotation of the driving magnets 46a and 46b of the magnetic stirrer 40, an upward flow is generated in the sample b. The sample b can be well stirred not only in the circumferential direction of the container 60 but also in the vertical direction.

  Moreover, since the support protrusion 21 becomes a rotation center when the stirrer 1 rotates, the rod-like body 10 can be supported by a portion that does not move during rotation. As a result, friction acting on the bottom surface of the container 60 can be reduced, and wear of the container 60 can be prevented.

  Further, since the magnet housing portions 15a and 15b are provided with a pair of stabilizing protrusions 23a and 23b on the side in contact with the container 60, when the stirrer 1 is tilted to the side due to the weight of the stirring blade 3. Since the stabilization protrusions 23a and 23b can contact the bottom surface of the container 60 to maintain a stable posture, the stirring bar 1 can be prevented from falling. Further, when the stirring bar 1 is tilted to the side during rotation, the tip portions of the stabilization protrusions 23a and 23b come into contact with the bottom surface of the container 60. Therefore, the contact area between the rod 10 and the bottom surface of the container 60 can be reduced. Can prevent wear.

  In addition, after the stirring is completed, the stirring bar 1 can be easily taken out from the container 60 by gripping the grip portion 35 of the support 11 with a finger. In this case, if the position of the holding part 35 is set to a position higher than the liquid level of the sample b, the stirrer 1 can be taken out without touching the sample b, and the hands are not soiled.

  As mentioned above, although one Embodiment of this invention was described, the specific aspect of this invention is not limited to the said embodiment.

  For example, in the present embodiment, the rod-like body 10 is a member having circular portions at both ends of a rectangular portion in plan view, but can be provided with stirring magnets 5a and 5b at both ends in the longitudinal direction. If it is, shape is not specifically limited, It can be set as various shapes, such as an ellipse and a rhombus.

  Moreover, in this embodiment, although the stirring blade 3 was a pair, if the sample b can be stirred favorable, the number and arrangement direction will not be specifically limited, and the several stirring blade 3 is a support body. 11 may extend radially from the center of 11.

  In the present embodiment, when the stirrer 1 rotates counterclockwise (in the direction indicated by the arrow P), an upward flow is generated in the sample b. However, a vertical stirring flow may be generated in the sample b. If possible, the configuration is not particularly limited. For example, a downward flow can be generated in the sample b by changing the inclination direction of the stirring blade 3. Further, the downward flow can also be generated by changing the rotation direction of the drive magnets 46a and 46b of the magnetic stirrer 40 in the reverse direction (clockwise in a plan view). According to such a configuration, while a downward flow is generated in the sample b, a lift acts on the rod-shaped body 10, so that the sample b can be satisfactorily stirred and the contact between the rod-shaped body 10 and the bottom surface of the container 60 is achieved. The pressure can be reduced, and wear on the bottom surface of the container 60 can be prevented.

  In addition, the stirring blade 3 can be configured so that the inclination direction can be appropriately changed. According to such a configuration, it is possible to select whether the stirring flow generated in the sample b is an upward flow or a downward flow according to the rotation direction of the driving magnets 46a and 46b of the magnetic stirrer 40.

  In the present embodiment, the support protrusion 21 has a conical shape. However, the shape of the support protrusion 21 is not particularly limited as long as it can prevent the bottom surface of the container 60 from being worn. May be.

  Further, in the present embodiment, the stabilization protrusions 23a and 23b are provided in an arc shape, but if the stirring bar 1 can be prevented from overturning and wear of the container 60 can be prevented, The configuration is not particularly limited. For example, you may be comprised from the some protrusion provided in the edge of magnet accommodating part 15a, 15b.

  In the present embodiment, the stirring means 2 has a configuration including the support body 11 extending along the rotation axis of the rod-shaped body 10 and the stirring blade 3 attached to the support body 11. If it can stir well, the structure will not be specifically limited. For example, it may be composed of spiral blades extending in the direction of the axis of rotation of the rod-shaped body 10, and in this case, it is preferable because a vertical stirring flow can be generated in the sample b during rotation. Further, the direction of the blades may be changeable. In this case, the stirring flow generated in the sample b is changed to an upward flow or a downward flow according to the rotation direction of the driving magnets 46a and 46b of the magnetic stirrer 40. You can choose either.

  Moreover, in this embodiment, although the stirring blade 3 inclined with respect to the support body 11, if the sample b can be stirred favorable, the inclination of the stirring blade 3 is not necessarily required. Moreover, you may combine the stirring blade 3 which inclined, and the stirring blade 3 which is not inclined.

  The shape of the stirring blade 3 is not particularly limited, and is a propeller type, straight type, swivel type, flat type, centrifugal force type, melting type, turbine type, anchor type, half moon type, screw type, saddle type, kneader Various shapes such as a mold and a fan mold can be used.

  Moreover, in this embodiment, although the stirring blade 3 was the structure attached to 1 step | paragraph to the support body 11, as shown in FIG. 4, it is attached in multiple steps along the axial direction of the support body 11. As shown in FIG. It may be a configuration. According to such a configuration, a large rotational force can be applied to the sample b, and the stirring can be further improved.

  Further, the stirring blade 3 may be detachably attached to the support 11 by a fixing screw 25 or the like provided at the center. According to such a configuration, various samples b from low viscosity to high viscosity sample b can be obtained by appropriately replacing the stirring blade 3 according to the characteristics of the sample b such as viscosity and the type of the sample b. According to this, good stirring can be performed.

  Further, in the present embodiment, the stirring rotator is configured by the rod-shaped member. However, the shape of the stirring rotator is not particularly limited as long as the stirring rotator is configured to be horizontally rotatable. Various shapes such as a radial shape can be used. FIG. 5 is a plan cross-sectional view of the stirring rotor 7 of the stirring bar 1 according to another embodiment of the present invention. The stirring bar 1 includes a stirring rotor 7 having a plurality of legs 8 extending radially from the center, and a tip of the leg 8 so that the magnetization direction is parallel to the rotation axis of the stirring rotor 7. A plurality of stirring magnets 5a, 5b, and 5c are provided. According to such a stirrer 1, the leg 8 prevents the stirrer 1 from falling and rotates stably, so that the sample b can be stirred well.

  Further, the number and arrangement positions of the stirring magnets 5 a, 5 b,... Are not particularly limited as long as the stirring bar 1 is rotated by the action of the rotating magnetic field while being accommodated in the container 60. For example, as shown by a dotted line in FIG. 5, a plurality of stirring magnets 5 a, 5 b, and 5 c may be arranged at equal intervals along a circumference centered on the rotation axis of the stirring rotating body 7. Good. According to such a configuration, the attractive force with the rotating magnetic field becomes stronger by the plurality of stirring magnets 5a, 5b, and 5c, so that the stirring rotating body 7 can be reliably rotated, and the high-viscosity sample b can be obtained. Even if it exists, it can stir well. Further, since the stirring magnets 5a, 5b, and 5c arranged at equal intervals are attracted to the rotating magnetic field with good balance, the stirring rotating body 7 can be smoothly rotated. Moreover, it is preferable that the plurality of stirring magnets 5a, 5b,... Are arranged so that all of the same poles are concentrically oriented in the same direction. According to such a structure, even if it is the highly viscous sample b, the stirring bar 1 can be rotated continuously and can be stirred favorably. That is, for example, in the embodiment shown in FIG. 5, due to the high-viscosity sample b, the viscous resistance at the time of rotation of the stirrer 1 becomes larger than the attractive force between the stirring magnet 5a and the driving magnet 46a facing the stirring magnet 5a. Although the coupling between the magnet 5a and the driving magnet 46a may be released, the same polarity of the adjacent stirring magnets 5a and 5b is directed in the same direction, so that the driving magnet 46a is the same as the stirring magnet 5a. Instead, the stirring magnet 5b can be immediately sucked, and the sample b can be stirred well without stopping the rotation of the stirring bar 1. Similarly, even if the coupling between the stirring magnets 5b and 5c and the driving magnets 46b and 46c is released, the driving magnets 46b and 46c immediately attract the stirring magnets 5c and 5a, respectively. Can be rotated. Further, according to the stirrer 1 having such a configuration, the stirring magnets 5a, 5b, and 5c do not repel any of the driving magnets 46a, 46b, and 46c, so that the stirrer 1 falls and the rotational position is shifted. Can be prevented.

  Further, the driving magnets 46a, 46b,... Of the magnetic stirrer 40 are disposed on the driving rotating body 43 corresponding to the stirring magnets 5a, 5b,. It is preferable to be arranged so as to be parallel to the rotation axis of the rotating body 43, and further, the magnetic poles different from the corresponding stirring magnets 5a, 5b,. preferable. That is, for example, in the embodiment shown in FIG. 1, the drive magnets 46 a and 46 b are arranged on the drive rotating body 43 at positions corresponding to the stirring magnets 5 a and 5 b, respectively. If the lower surface side of the stirring magnets 5a and 5b is the S pole (or N pole) in the state accommodated in the container 60, the upper surface side of the corresponding driving magnets 46a and 46b is the N pole (or S pole). It is preferable that they are arranged. According to such a stirrer 1 and a stirrer provided with the magnetic stirrer 40 corresponding thereto, the arrangement of the stirring magnets 5a, 5b,... And the driving magnets 46a, 46b,. Therefore, the stirrer 1 can be reliably rotated in accordance with the rotation of the driving rotator 43, and the sample b can be reliably agitated.

  Further, the driving rotating body 43 of the magnetic stirrer 40 may be supported so as to be movable up and down along the rotating shaft by making the shaft portion 44 a member that can be expanded and contracted. Further, the configuration of the driving rotating body 43 is not limited as long as it can be lifted and lowered, and a configuration in which lifting and lowering means (not shown) is provided between the motor 45 and the bottom of the main body 41 may be used. According to such a configuration, the sample b can be obtained by moving the drive rotator 43 up and down and appropriately changing the distance between the stirring magnets 5a, 5b,... And the drive magnets 46a, 46b,. Can be efficiently stirred according to the viscosity of the. For example, when the sample b has a low viscosity, the driving rotator 43 is lowered to increase the distance between the stirring magnets 5a, 5b,... And the driving magnets 46a, 46b,. The stirring bar 1 can be rotated by reducing the attractive force. Thereby, since the frictional force between the stirring bar 1 and the bottom surface of the container 60 is reduced, the energy loss during the rotation of the stirring bar 1 can be reduced, and the sample b can be stirred efficiently. Further, wear of the bottom surface of the container 60 and the support protrusion 21 and the stabilization protrusions 23a and 23b that are in contact with the bottom surface of the container 60 can be prevented.

  Further, the configuration of the drive rotator 43 is not particularly limited as long as it can rotate horizontally. As shown in FIG. 6, the long rotating arm 51 extending in the horizontal direction from the center and the length of the long rotating arm 51 are longer. The short short rotating arm 52 is provided, and the stirring magnets 5a, 5b and 5c, 5d may be arranged at the tip of the long rotating arm 51 and the tip of the short rotating arm 52, respectively. . According to such a configuration, when the stirring rotor 7 of the stirrer 1 is small, the stirrer 1 is rotated by the rotating magnetic field of the short rotating arm 52, while when the stirring rotor 7 is large, the stirrer 1 is long. By rotating the stirrer 1 by the rotating magnetic field of the rotating arm 52, the sample b can be well stirred according to the size of the stirring rotating body 7.

It is a longitudinal cross-sectional view of the stirring apparatus which concerns on one Embodiment of this invention. It is a top view of the stirring bar of the stirring apparatus shown in FIG. It is a longitudinal cross-sectional view of the conventional stirring bar. It is a side view of the stirring bar which concerns on other embodiment of this invention. It is a plane sectional view of a rotating body for stirring of a stirring bar according to still another embodiment of the present invention. It is a plane sectional view of the rotating body for a drive of the stirring device concerning other embodiments of the present invention.

Explanation of symbols

b Sample 1 Stirrer 2 Stirring Means 3 Stirring Blade 5a Stirring Magnet 7 Stirring Rotating Body 10 Rod-Shaped Body 11 Supporting Body 21 Supporting Projection 23a Stabilizing Projection 35 Grasping Portion 46a Driving Magnet 40 Magnetic Stirrer 60 Container

Claims (13)

A stir bar that stirs a liquid sample contained in a container by rotation,
A rotating body for stirring that can be rotated horizontally;
A stirrer provided with a stirring magnet arranged on the rotating body for stirring so that a magnetization direction is parallel to a rotation axis of the rotating body for stirring. The stirring rotating body is a rod-shaped body,
The stirrer according to claim 1, wherein the pair of stirring magnets are respectively disposed at both ends of the rod-shaped body in the longitudinal direction.   The stirrer according to claim 1, further comprising stirring means that rotates integrally with the stirring rotating body.   The stirrer according to claim 3, wherein the stirring means is provided so as to generate a vertical stirring flow in the sample during rotation. The stirring means includes a support extending along the rotation axis of the stirring rotating body, and a stirring blade attached to the support.
The stirring bar according to claim 4, wherein the stirring blade is inclined with respect to the axial direction of the support.   The stirrer according to claim 5, wherein the support includes a grip portion at a tip portion.   The stirrer according to claim 5 or 6, wherein the stirring blades are attached in multiple stages along the axial direction of the support.   The stirring bar according to claim 5, wherein the stirring blade is detachably attached to the support.   The stirrer according to any one of claims 1 to 8, wherein a support protrusion that protrudes to a side in contact with the container is provided at a rotation center of the stirring rotating body.   The stirrer according to claim 9, wherein a plurality of stabilizing protrusions having a height lower than that of the support protrusion are provided on an end of the stirring rotating body on a side in contact with the container.   A plurality of the stirring magnets are arranged at equal intervals along a circumference centering on the rotation axis of the stirring rotating body, and are arranged so that all the same poles are concentric but face the same direction. The stirrer according to any one of claims 1 to 10. A stirrer comprising: the stirrer according to any one of claims 1 to 11; and a rotating magnetic field generation unit configured to generate a rotating magnetic field so that the stirrer rotates in a state of being accommodated in a container,
The rotating magnetic field generating means includes a driving rotator that is horizontally rotatable, a rotation driving means that rotationally drives the driving rotator, and a drive that is disposed on the driving rotator corresponding to the stirring magnet. And a magnet for
The driving magnet is arranged so that the magnetization direction is parallel to the rotation axis of the driving rotating body, and the magnetic poles different from the corresponding stirring magnet are arranged to face each other. Stirring device. The stirring device according to claim 12, wherein the driving rotating body is supported so as to be movable up and down along a rotation axis.

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