JP2972192B1 - Magnetic stirrer and stirring vessel used for it - Google Patents

Abstract

An object of the present invention is to perform a stirring operation on a plurality of samples at the same time, and to reduce the size and the occupied area. A driving motor (6) having a vertically upward rotating shaft (14), a driving magnet (18) arranged in two upper and lower stages such that the S pole and the N pole rotate horizontally in directions different from each other by 180 degrees on the rotating shaft, A stirring vessel holder 12 provided with a plurality of stirring vessel installation holes 24 so as to surround the rotation region of the driving magnet, a cylindrical stirring vessel 26 having a bottomed bottom standing and held by each of the stirring vessel installation holes, and a rod-shaped permanent magnet A stirrer 32 is provided. The drive unit 10 has a hermetically sealed structure surrounded by a convex case 20 so that the stirring vessel holder can be detached. The stirring vessel is formed by integrally molding a container body having a test tube shape with a synthetic resin and an elliptical opening, and the opening is preferably an elliptical shape that can be elastically deformed. The minor diameter of the opening during normal operation is set smaller than the outer diameter of the permanent magnet stirrer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a driving magnet for rotating a permanent magnet stirrer, which is installed in a vertical direction, and a plurality of cylindrical stirring vessels having a bottom are set up circumferentially so that they can be simultaneously placed. The present invention relates to a magnetic stirrer capable of performing a stirring operation on a plurality of samples, and a stirring container suitable for the magnetic stirrer. This apparatus is suitable for efficiently performing the stirring or extraction operation in various analysis operations in a space-saving manner.

[0002]

2. Description of the Related Art In a nuclear fuel reprocessing facility, a plurality of samples are analyzed in an analysis cell or a glove box. As a pre-processing operation for the analysis operation, operations such as stirring and extraction of the sample or collection of the pre-processing sample by a sampling chip are required. Conventionally, a stirrer called “magnetic stirrer” has been used for this purpose.

In a conventional magnetic stirrer, a rod-shaped driving magnet is rotated in a horizontal plane by a driving motor, and a circular flat-bottomed stirring vessel such as a beaker is placed on a table above the horizontally rotating driving magnet. A stirrer made of a rod-shaped permanent magnet is charged into the stirring vessel. Therefore,
The bar-shaped permanent magnet stirrer rotates in a lying sideways state, and stirs the liquid in the stirring vessel.

[0004]

However, such a conventional structure has the following problems. In selecting a stirring vessel, a round and flat-bottomed vessel (such as a beaker) having a diameter equal to or longer than the length of the stirrer must be used, and it is difficult to handle the stirring vessel particularly in remote operation. One stirrer is required for each sample, and the processing capacity is low. Therefore, workability is extremely poor especially when the number of samples to be processed is large. If a plurality of stirrers are installed and parallel work is performed to increase the processing capacity, the work area occupied by the stirrer increases.
In particular, when working in a limited space such as in a glove box, the problem of increasing the occupied area is extremely uneconomical and difficult to implement.

An object of the present invention is to provide a magnetic stirrer capable of simultaneously performing a stirring operation on a plurality of samples, and further reducing the size and occupying area. Another object of the present invention is to easily attach / detach to / from a magnetic stirrer, enter / extract a stirrer into / from a stirrer container, even by remote control, regardless of the skill level of an operator. The object of the present invention is to provide a stirring vessel capable of performing the following.

[0006]

According to the present invention, there is provided a drive motor having a vertically upward rotating shaft, and two upper and lower stages such that the S pole and the N pole rotate horizontally in directions different from each other by 180 degrees. A driving magnet disposed therein, a stirring container holder capable of standing and holding a plurality of cylindrical stirring containers having a bottom so as to surround a rotation region of the driving magnet, and a rod-shaped permanent magnet stirring supplied into each stirring container. It is a magnetic stirrer with a child.

For example, a drive unit having a drive motor and a drive magnet has a hermetically sealed structure surrounded by a convex case, and an annular stirring vessel holder can be attached to and detached from the convex case. A plurality of stirring vessel installation holes are provided in the stirring vessel holder in a circumferential shape so that the stirring vessel can be inserted into each of the stirring vessel installation holes.

[0008] The stirring vessel used in the magnetic stirrer comprises, for example, a vessel body in the shape of a test tube and an elliptical opening, and the opening is easily expanded into a circular shape by applying a pressing force in the longitudinal direction. It has an elastically deformable structure that opens and recovers when the pressing force is released. The minor diameter of the opening at the time of normal operation is set smaller than the outer diameter of the permanent magnet stirrer. It is preferable to integrally mold with a synthetic resin so that the container body having the shape of the test tube and the elliptical opening have a continuous structure.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The drive magnet may have a configuration in which two rod-shaped permanent magnets are installed in two stages, but two U-shaped (horse-shoe-shaped) permanent magnets are back-to-back (with respect to the rotation axis). And symmetrically with respect to the rotation axis, and fixed to the rotation axis so that the magnetic poles are opposite to each other.

[0010]

FIG. 1 is an explanatory view showing an embodiment of a magnetic stirrer according to the present invention, FIG. 2 is an explanatory view of a drive unit, and FIG. 3 is an explanatory view of a stirring vessel holder. The magnetic stirrer mainly includes the driving unit 10 and the stirring vessel holder 1.
It consists of two combinations. FIG. 4 is an explanatory view of a stirring vessel suitable for the magnetic stirrer.

The driving unit 10 includes a driving motor 16 having a vertically upward rotating shaft 14, and a driving magnet that horizontally arranges bar-shaped permanent magnets arranged in two stages vertically and opposite to each other with respect to the rotating shaft 14. The drive motor 16 and the drive magnet 18 are enclosed by a convex case 20 to form a sealed structure. The upper convex portion of the convex case 20 has a columnar shape. This convex case 20 is used in an operating environment (corrosive atmosphere).
It is made of a material such as polyethylene resin or polytetrafluoroethylene resin in consideration of the magnetic induction efficiency with a stirrer described later. Due to the hermetic structure of the convex case 20, it has waterproofness and chemical resistance.

A control unit 22 for controlling the operation of the driving unit 10 is provided. It contains a power switch, a drive motor rotation speed control circuit, a timer, and the like. In this embodiment, an integral type with the drive unit is shown, but a separate type may be used. When the separation type is used, the control unit can be installed outside the cell in remote work such as a cell line, thereby improving operability.

The stirring vessel holder 12 is provided so as to surround the rotation area of the driving magnet 18 of the driving section 10 (the cylindrical convex portion of the convex case 20). This stirring vessel holder 12
Has an annular shape as a whole, and is configured to be fitted into the upper convex portion of the convex case 20 and to be easily attached and detached. The stirring vessel holder 12 is provided with eight stirring vessel installation holes 24 circumferentially at equal intervals. Each of the stirring vessel installation holes 24 is designed to have a slightly larger hole diameter than the outer diameter of the stirring vessel 26 so that the cylindrical stirring vessel 26 having a bottom can be easily inserted. Further, a circumferential groove 28 is formed on the outer surface of the stirring vessel holder 12, and the circumferential groove 28 is cut until reaching the side wall of each stirring vessel installation hole 24.
Then, a spring 30 is mounted inside the circumferential groove 28. The spring 30 has a function of holding down and holding the stirring vessel 26 inserted into the stirring vessel installation hole 24.
The stirring vessel holder 12 is also made of a material such as polyethylene resin or polytetrafluoroethylene resin in consideration of the use environment (corrosive atmosphere) and the magnetic induction efficiency with the stirrer described later. The spring 30 is made of stainless steel.

A rod-shaped permanent magnet stirrer 32 is put into each stirring vessel 26. This permanent magnet stirrer 32
Has a structure in which the outside of a round bar-shaped permanent magnet is coated with a resin, and both ends are formed in a hemispherical shape, and an intermediate portion is formed in a cylindrical shape so as to rotate as smoothly as possible. The length of the permanent magnet is preferably set to be substantially equal to the height from the lower surface of the magnet below the driving magnet 18 disposed in the upper and lower stages of the driving unit 10 to the upper surface of the upper magnet. Therefore, the permanent magnet stirrer 32 is leaned against the container wall in a state where no magnetic force is applied from the outside, and the stirring container 26 is tilted.
Will fit within.

A permanent magnet stirrer 32 is placed in a stirring vessel 26 together with a liquid to be stirred and the like, and inserted into a stirring vessel installation hole 24 of the stirring vessel holder 12. Then, the stirring container 26 is held by the spring 30 from the outer peripheral side in a standing state.

The control unit 10 controls the number of rotations of the driving motor,
Set the stirring time and start. The drive motor 16 rotates accordingly. The drive motor 16 is power for rotating the drive magnet 18. Drive magnet 1
Numeral 8 rotates in a horizontal plane, and applies a rotational force to the permanent magnet stirrer 32 in the stirring vessel 26 by magnetic induction. Since each permanent magnet stirrer 32 is almost standing in the cylindrical stirring vessel 26, the N pole is located above or the S pole is located above depending on the orientation at the time of loading. Then, assuming that the permanent magnet stirrer 32 has been loaded into the stirring vessel 26 with its N pole facing upward, when the S pole of the upper drive magnet approaches, it is attracted inward by the attractive force (at that time, the permanent magnet is permanently set). Below the magnetic stirrer 32 is the south pole, and since the north pole of the lower drive magnet approaches, the permanent magnet stirrer is eventually drawn inward as a whole). Conversely, when the north pole of the upper driving magnet approaches, a repulsive force acts to move the permanent magnet stirrer outward (as the south pole of the lower driving magnet approaches, as well). In this manner, the permanent magnet stirrer 32 rotates in the cylindrical stirring container 26 in a certain direction along the container wall in a standing direction in synchronization with the rotation of the drive magnet 18, and rotates the sample (liquid) inside the cylindrical stirring container 26. ) Will be stirred.

When performing an extraction operation, an analysis sample, an extract, and a permanent magnet stirrer may be placed in a stirring vessel and a stirring operation may be performed.

In the above embodiment, eight stirring vessels can be installed at the same time. However, the size and number of stirring vessels can be changed by changing the diameter and number of the stirring vessel installation holes.
It can be arbitrarily selected.

As a stirring vessel used in such a magnetic stirrer, for example, a structure as shown in FIG. 4 is suitable. That is, a container body 4 having a test tube shape and a perfect circular cross section.
0 and an elliptical opening 42 are continuous. The stirring container 26 is integrally formed of a synthetic resin such as a polyethylene resin. By pressing the both ends of the convex portion of the opening portion 42 with fingers by applying a pressing force to the opening portion 42 in the major diameter direction, the stirring container 26 is opened. The portion 42 has an elastic deformation structure that easily expands in a circular shape and is restored by releasing the pressing force. Therefore, the permanent magnet stirrer 32 can be easily inserted into the stirring vessel 26 or the permanent magnet stirrer can be easily taken out from the stirring vessel 26 by expanding the opening 42 into a circular shape by sandwiching it with fingers. it can. In addition, a sampling chip for sampling can be inserted, and a sample can be directly collected. Further, the minor diameter of the opening 42 is usually set smaller than the outer diameter of the permanent magnet stirrer 32. Thereby, there is no fear that the permanent magnet stirrer 32 jumps out of the stirring vessel 26 during stirring.

The neck of the stirring vessel 26 is preferably provided with a plurality of non-slip portions 44 formed of a number of vertical projections over substantially the entire circumference. As a result, the stirring vessel can be reliably held even in remote operation or the like.

[0021]

As described above, the present invention has a structure in which the stirring vessel holder is mounted on the drive unit, and the stirring vessel holder has a structure in which a plurality of stirring vessels can be mounted at one time. By preparing for each purpose and application, one drive unit can be used to install and operate an arbitrary volume and number of stirring vessels at the same time. Therefore, the area occupied by the device can be reduced, the operation efficiency can be improved, and the economy is excellent. Further, in the present invention, since the stirring vessel can be set simply by inserting the stirring vessel into the stirring vessel installation hole of the stirring vessel holder, the work can be easily performed even by remote control.

Further, when the drive unit has a sealed structure according to the present invention,
It can be used in any atmosphere and the durability can be improved. For these reasons, the magnetic stirrer according to the present invention is extremely effective particularly in an analytical facility requiring remote control in a cell, such as a reprocessing plant.

The agitating container according to the present invention has an elliptical opening in the container, and the opening can be changed to a circular shape by lightly sandwiching the container. Become. For this reason, it is not necessary to cut the nozzle container at the time of sampling, the danger of damage to gloves or the like due to the use of scissors is eliminated, work safety is improved, and analysis accuracy is improved by preventing the entry of foreign matter. In addition, the permanent magnet stirrer can be easily taken in and out of the stirrer, allowing sorting work after use, and the permanent magnet stirrer does not fall out of the stirrer due to an operation error, which also improves workability. Can be achieved.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a magnetic stirrer according to the present invention.

FIG. 2 is an explanatory diagram of a driving unit.

FIG. 3 is an explanatory view of a stirring vessel holder.

FIG. 4 is an explanatory view showing one embodiment of a stirring container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Drive part 12 Stirring container holder 14 Rotating shaft 16 Driving motor 18 Drive magnet 26 Stirring container 32 Permanent magnet stirrer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B01F 13/08

Claims (3)

(57) [Claims] A driving motor having a vertically upward rotating shaft; a driving magnet disposed in two upper and lower stages such that an S pole and an N pole rotate horizontally in directions different from each other by 180 degrees on the rotating shaft; A stirring vessel holder capable of standing and holding a plurality of bottomed cylindrical stirring vessels so as to surround the rotation region of the drive magnet;
A drive unit having a drive motor and a drive magnet is provided with a convex case;
A sealed structure covered with a stirrer against the convex case
The container holder has a detachable structure, and the stirring container holder
Stirring vessels that can be installed in a circle around a plurality of stirring vessels
Magnetic stirrer with installation holes . 2. A stirring container used for the magnetic stirrer according to claim 1, comprising a container main body having a test tube shape and an elliptical opening, and the opening applies a pressing force in a major diameter direction. This is an elastically deformable structure that easily expands into a circular shape and is restored by releasing the pressing force, and the minor diameter of the opening is set to be smaller than the outer diameter of the permanent magnet stirrer at normal times. A stirring vessel characterized by the above-mentioned. 3. The stirring vessel according to claim 2, wherein the vessel body having a test tube shape and the elliptical opening are continuous, and are integrally formed of synthetic resin.