JPH1176788A - Magnetic stirrer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic stirrer in which permanent magnets can be easily replaced or increased. SOLUTION: On a magnetic stirrer 1A, a sample housing vessel 5 provided with a stirring part 15 rotatably supported is mounted. To a rotating shaft 3a of a vertical motor 3 for driving the magnetic stirrer 1A, a magnet support base 10 consisting of a magnetic substance is fitted. On the magnet support base 10, one or plural pairs of permanent magnets 11a, 11b are freely attachably and detachably fixed in bilaterally symmetrical positions centered on the rotating shaft 3a of the motor 3 by using magnetic force of the permanent magnets 11a, 11b. The motor 3, the magnet support base 10 and the permanent magnets 11a, 11b are housed in a cover 9 which is freely attachable and detachable. Thus, the permanent magnets can be easily replaced, and can be increased or decreased according to the size of the stirring part of a magnetic substance arranged in the sample housing vessel. Furthermore, it is thinkable that as the permanent magnet, a ferrite magnet is put between plates made of iron from back and forth to form it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION In the field of physics and chemistry, recently, reagents and culture media have been frequently used for preparing reagents and culture media in order to stir the reagents and culture media in a container connected to a magnetic stirrer to stabilize the concentration. The present invention relates to an improvement of a magnetic stirrer for driving a stirrer used in such applications.

[0002]

2. Description of the Related Art A conventional stirrer using a magnetic stirrer is configured as shown in FIG. In the figure, 1 is a magnetic stirrer, which is a casing 2
And a driving permanent magnet 4 connected to a rotating shaft 3a of the motor 3.
Reference numeral 5 denotes a stirring vessel mounted on the upper surface of the magnetic stirrer 1. At the center of the bottom of the inner wall of the vessel 5, a magnetic stirring bar 6 is rotatably fixed with a central axis 7 as a fulcrum.
As a structure for this purpose, it is conceivable to dispose a ball bearing 7b on the central shaft 7. Reference numeral 8 denotes a sample stored in the container 5.

In the above configuration, when the motor 3 is driven, the permanent magnet 4 is rotated, and the stirrer 6 is also rotated by receiving the magnetic force of the permanent magnet 4, so that the sample 8 stored in the container 5 is stirred. The sample concentration is always homogenized.

[0004]

By the way, as an operating magnet used in a magnetic stirrer,
As described above, it is customary to use a permanent magnet. However, the magnetic force of the permanent magnet decreases with the elapse of the use period. However, in the conventional magnetic stirrer, the permanent magnet on the stirring drive side is fixed to the motor shaft and sealed inside the casing. There was no choice but to buy Chic Stirrer, and the improvement was required. Depending on the amount and viscosity of the sample solution, it is necessary to replace the stirrer provided on the container side with a large and long stirrer.In this case, the capacity of the permanent magnet for driving the magnetic stirrer is constant. However, there is a problem that the magnetic force is insufficient to rotate the long stirrer, and the sample cannot be properly stirred.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic stirrer which solves the above-mentioned problems of the prior art. Therefore, according to the first aspect of the present invention, there is provided a magnetic stirrer on which a sample container having a stirrer rotatably supported is mounted, and a vertical motor for driving the magnetic stirrer. A magnet support made of a magnetic material is mounted on the rotation axis of the motor, and one or more pairs of permanent magnets are placed on the magnet support at positions symmetrical with respect to the rotation axis of the motor. And the motor, the magnet support and the permanent magnet are housed in a removable cover. According to the second aspect of the present invention, the number and size of the permanent magnets fixed to the magnet support table by magnetic force correspond to the size of the magnetic stirring bar arranged in the sample container. Then, it was configured to be mounted on the magnet support table. According to the third aspect of the present invention, the magnet support is formed in a substantially rectangular shape having a width slightly larger than the width of the permanent magnet and a length up to the diameter of the cover. According to the fourth aspect of the present invention, a ferrite magnet is formed as a permanent magnet by sandwiching the front and rear portions thereof with iron plates.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a vertical sectional front view showing an embodiment of the present invention. In FIG. 1, the same components as those in the related art are denoted by the same reference numerals as those in FIG. 4, and detailed description thereof is omitted. In FIG. 1, reference numeral 1A denotes a magnetic stirrer of the present invention, which includes a vertical motor 3 for driving in a cover 9 and a magnet support made of a magnetic material attached to a rotating shaft 3a of the motor 3 as shown in FIG. As shown in FIG. 2A, the table 10 and the magnet support table 10 are provided with two driving permanent magnets 11a and 11b arranged at symmetric positions with respect to the rotation axis 3a. Note that these permanent magnets 11a and 11b have a length corresponding to the length of the stirrer 15 disposed in the container 5 described later.
If the stirrer 15 is about the same length as the stirrer 6 in FIG. 4, one permanent magnet may be provided. Note that the cover 9 replaces the conventional casing 2 of FIG. 4 and has a bottomless shape such that the cup is arranged downward as shown in FIGS. As the permanent magnets 11a and 11b, those having the same rectangular shape are used.
As shown in (B) and (C), the ferrite magnet 12 is disposed in the longitudinal direction, and the side surface in the front-back direction is
For example, it is conceivable that one plate 13 is used as an N-pole and the other plate 14 is used as an S-pole. On the other hand, the stirrer 15
Is rotatably provided about the center of the inner wall, and accommodates a sample 8 as a solution.

In the above configuration, when the motor 3 is driven, the magnet support 1 on which the pair of permanent magnets 11a and 11b are mounted is mounted.
0 is rotated, and the stirrer 15 also rotates by receiving the magnetic force of the pair of permanent magnets 11a and 11b, so that the sample 8 stored in the container 5 is stirred and the sample concentration is made uniform.

Next, when the sample 16 stored in the container 5 for culturing is more viscous than the sample 8 in FIG. 1 (including the case where the amount of the sample is large), the sample 16 is placed in the container 5. Stirrer 17
Also, as shown in FIG. 3, it is necessary to use a stirrer 17 longer than the stirrer 15 of FIG. 1, but in such a case, the magnetic stirrer 1A of the present invention can cope with the following. That is, the cover 9 is removed, and in addition to the pair of permanent magnets 11a and 11b mounted on the magnet support 10, a pair of additional permanent magnets 11c and 11d are attached to the rotating shaft 3a as shown in FIG. Then, the magnetic stirrer 1B is placed at a position symmetrical to the left and right opposite to the stirrer 17, and the volume is increased by covering the cover 9, and then the container 5 is placed thereon. good. Also in this case, the motor 3
Drives the magnet support base 10 on which the permanent magnets 11a to 11d are mounted, so that the stirrer 17 rotates by receiving an appropriate magnetic force and stirs the sample 16. Therefore, the concentration of the sample 16 can be kept uniform in the container 5.

The present invention is not limited to the configuration of the above embodiment. For example, in the above-described embodiment, the case where the shape of the magnet support base is rectangular is shown. However, instead of such a shape, the outer peripheral sides at the left and right ends may be formed in a disk shape. In short, it is sufficient that one or a plurality of pairs of permanent magnets can be arranged at symmetrical positions. Further, although the shape of the driving permanent magnet is shown as being rectangular, the present invention is not limited to this. For example, a large number of small permanent magnets having various shapes such as a circle and a square may be arranged. Further, the material of the permanent magnet may be a permanent magnet other than the ferrite magnet, and may be a material in which no iron plate is provided before and after.

[0010]

As described above, the magnetic stirrer of the present invention has a structure in which the driving permanent magnet is detachable.
It has the following excellent effects. (1) According to the first aspect of the present invention, the permanent magnet for driving is simply fixed on the magnet support base by magnetic force. Therefore, a periodic inspection of the magnetic stirrer is performed. The driving permanent magnet with the reduced value can be easily replaced with a new one, and the magnetic force of the permanent magnet can be maintained at an appropriate value. (2) Further, when it is necessary to change the size of the stirrer on the container side depending on the amount and viscosity of the sample to be cultured, a magnetic force corresponding to this need to be generated. Since the driving permanent magnet can be easily increased or decreased, the magnetic force of the magnetic stirrer can always be made appropriate for the sample. (3) Further, when the magnet support is formed in a substantially rectangular shape having a width slightly larger than the width of the permanent magnet and a length up to the diameter of the cover as described in claim 3, it is possible to obtain a simple configuration. Necessary permanent magnets for driving can be supported. (4) Further, as shown in FIG. 2 (B), when the magnetic poles are formed by sandwiching the front and back of the ferrite magnet with an iron plate as shown in FIG. However, since a ferrite magnet having good magnetic properties can be used with increased use strength, practicality can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing a configuration of a magnetic stirrer according to an embodiment of the present invention and a stirrer provided with a container driven by stirring.

FIG. 2A is a plan view showing a state of a pair of permanent magnets mounted on a magnet support, and FIGS. 2B and 2C are examples of the configuration of one permanent magnet; It is an enlarged plan view and an enlarged side view showing.

FIG. 3 is a vertical sectional front view of a stirrer provided with a magnetic stirrer of the present invention, showing an example in which a permanent magnet of a magnetic stirrer is replaced in accordance with replacement of a stirrer on a container side.

FIG. 4 is a longitudinal sectional front view of a conventional stirrer provided with a magnetic stirrer.

[Explanation of symbols]

 1A, 1B: Magnetic stirrer of the present invention 3: Vertical motor 3a: Rotating shaft 5: Sample storage container 8: Sample 9: Cover 10: Magnet support base 11a to 11d: Permanent magnet

Claims (4)

[Claims] 1. A magnetic stirrer on which a sample container having a stirrer rotatably supported is mounted, wherein a magnetic material is attached to a rotating shaft of a vertical motor for driving the magnetic stirrer. A magnet support base is mounted, and one or more pairs of permanent magnets are detachably mounted on the magnet support base at positions symmetrical about the rotation axis of the motor using the magnetic force of the permanent magnets. A magnetic stirrer, wherein the motor, the magnet support and the permanent magnet are fixed and housed in a removable cover. 2. The number and size of the permanent magnets fixed to the magnet support base by magnetic force are increased or decreased in accordance with the size of a magnetic stirring bar disposed in the sample container. The magnetic stirrer according to claim 1, wherein the magnetic stirrer is mounted on a support table. 3. The magnetic stirrer according to claim 1, wherein the magnet support is formed in a substantially rectangular shape having a width slightly larger than a width of the permanent magnet and a length up to a diameter of the cover. 4. The magnetic stirrer according to claim 1, wherein a ferrite magnet is formed as a permanent magnet by sandwiching a ferrite magnet between its front and rear sides.