Magnetic stirring system

Abstract

The utility model belongs to the technical field of analysis and testing, and particularly relates to a stirring device for uniformly mixing samples in a container. The magnetic stirring system comprises a permanent magnet rotating under the action of a driving device, a test tube arranged on a fixed bracket, and a permanent magnet stirrer arranged in the test tube, the permanent magnet stirrer is of a disc-shaped structure, and an S pole and an N pole are distributed up and down in the thickness direction; the permanent magnet is positioned laterally below the test tube; as the center line A of the test tube does not coincide with the rotation center line B of the permanent magnet, the permanent magnet stirrer in the test tube is in an inclined state under the action of magnetic coupling; when the permanent magnet rotates, an alternating magnetic field is formed, the permanent magnet stirrer is driven to obliquely rotate, the oblique rotation of the permanent magnet stirrer can realize the horizontal stirring of a sample in a test tube, and the vertical stirring of the sample in the test tube can be realized, so that the purpose of fully and uniformly mixing is realized. The device is particularly suitable for uniformly stirring and mixing samples in test tubes with smaller diameters.

Description

Technical Field

[0001] The utility model belongs to the technical field of analysis and testing, and particularly relates to a stirring device for mixing samples in a container. Background Art

[0002] Magnetic stirring is a commonly used technical means in the process of analytical testing. Its main purpose is to fully mix the sample in the container. Traditional magnetic stirring equipment such as Figure 1 As shown in the figure, it is composed of a rotary drive system, a permanent magnet, a container, a stirrer, a container fixing bracket, etc. The container is placed directly above the permanent magnet, and the stirrer is mostly cylindrical. When working, the rotary drive system drives the permanent magnet to rotate horizontally, forming an alternating magnetic field, driving the stirrer in the container to rotate horizontally, thereby realizing horizontal stirring of the sample in the container to achieve the purpose of uniform mixing.

[0003] However, in actual work, it is often necessary to stir samples in test tubes with smaller diameters. Due to the limitation of the test tube diameter, only a stirrer with a shorter diameter can be used. When the liquid level in the test tube is high, the stirrer rotates horizontally at the bottom of the test tube, and the sample in the test tube cannot be fully mixed from top to bottom. Utility Model Content

[0004] The utility model aims to provide a magnetic stirring system for achieving full stirring of samples in a test tube with a smaller diameter.

[0005] The technical scheme of the utility model is: a magnetic stirring system, which comprises: a permanent magnet rotating under the action of a driving device, a test tube placed on a fixed bracket, and a permanent magnetic stirring bar placed in the test tube.

[0006] The permanent magnetic stirrer is a disc-shaped structure, with the S and N poles distributed up and down along the thickness direction; the permanent magnet is located at the lower side of the test tube; because the center line A of the test tube does not coincide with the rotation center line B of the permanent magnet, the permanent magnetic stirrer is in an inclined state with one end high and the other end low in the test tube under the coupling of magnetic lines of force, and the lower end is in contact with the inner wall of the bottom of the test tube. When the permanent magnet rotates, an alternating magnetic field is formed, which drives the permanent magnetic stirrer to rotate obliquely, that is, to roll and rotate with the diameter passing through the contact point with the bottom of the test tube as the axis, so as to fully stir the sample in the test tube.

[0007] On the basis of the above scheme, further, considering that the sample in the test tube may be corrosive, the outer layer of the permanent magnet in the permanent magnetic stirrer is wrapped with a corrosion-resistant layer, and the corrosion-resistant layer can be made of PTFE or PP.

[0008] On the basis of the above scheme, further, during the rotation of the permanent magnetic stirrer, in order to avoid collision with the bottom of the test tube and to ensure smoother rotation, the bottom of the test tube is preferably an arc-shaped structure.

[0009] On the basis of the above scheme, there are two different arrangements of the permanent magnets below the side of the test tube:

[0010] The first type: the center line A of the test tube is parallel to the rotation center line B of the permanent magnet, and the center line A of the test tube deviates from the rotation center line B of the permanent magnet by at least 1 mm. In this case, if multiple test tubes and permanent magnets are arranged at the same time; the multiple test tubes are arranged in an array with intervals, and the permanent magnets are arranged under the corresponding test tubes. The rotation drive device includes: a motor, a transmission belt, a transmission wheel and a transmission shaft; each permanent magnet is installed on a transmission shaft, and the transmission shaft is equipped with a transmission wheel; each transmission wheel and the output shaft of the motor are driven by a transmission belt.

[0011] The second type: the center line A of the test tube is perpendicular to the rotation center line B of the permanent magnet. In this case, if multiple test tubes and permanent magnets are arranged at the same time, the multiple test tubes are arranged in an array with equal spacing; the driving device includes: a motor; multiple permanent magnets are arranged on the output shaft of the motor at intervals and are located at the side and lower side of the corresponding test tubes.

[0012] Beneficial effect: In the utility model, the permanent magnet and the test tube are non-coaxially arranged, and the permanent magnetic stirrer in the test tube is in an inclined state under the action of magnetic coupling. When the permanent magnet rotates, the permanent magnetic stirrer rotates obliquely, which can not only stir the sample in the test tube horizontally, but also stir the sample in the test tube vertically to achieve the purpose of sufficient mixing. It is particularly suitable for stirring and mixing samples in test tubes with smaller diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a magnetic stirring device in the prior art described in the background technology;

[0014] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present utility model;

[0015] Figure 3 This is another structural schematic diagram of Embodiment 2 of the present utility model;

[0016] Figure 4 This is a schematic diagram of the structure of Embodiment 3 of the present utility model;

[0017] Wherein: 1-driving device, 1.1-motor, 1.2-transmission belt, 1.3-transmission wheel, 1.4-transmission shaft, 2-permanent magnet, 3-test tube, 4-permanent magnetic stirring bar. DETAILED DESCRIPTION

[0018] Embodiment 1, a magnetic stirring system, comprises: a permanent magnet 2 rotating under the action of a driving device 1, a test tube 3 placed on a fixed bracket 5, and a permanent magnetic stirring bar 4 placed in the test tube 3.

[0019] See attached Figure 3 The permanent magnetic stirrer 4 is a disc-shaped structure, with the S and N poles distributed up and down along the thickness direction; the permanent magnet 2 is located at the side and bottom of the test tube 3. Since the center line A of the test tube 3 deviates from the rotation center line B of the permanent magnet 2, the permanent magnetic stirrer 4 is in an inclined state with one end high and the other end low in the test tube 3, and the lower end is in contact with the inner wall of the bottom of the test tube 3. When the permanent magnet rotates, an alternating magnetic field is formed, which drives the permanent magnetic stirrer 4 to rotate obliquely, that is, Figure 2 The sample in the test tube 3 is fully stirred by rolling and rotating with the center line C in the test tube as the axis.

[0020] Considering that the sample in the test tube 3 may be corrosive, the outer layer of the permanent magnet in the permanent magnetic stirrer 4 is wrapped with a corrosion-resistant layer, and the corrosion-resistant layer can be made of PTFE or PP.

[0021] During the rotation of the permanent magnetic stirrer 4, in order to avoid collision with the bottom of the test tube 3 and to ensure smoother rotation, the bottom of the test tube 3 is preferably an arc-shaped structure.

[0022] Embodiment 2, based on embodiment 1, further defines the arrangement of the permanent magnet 2:

[0023] See attached Figure 2 In this example, the center line A of the test tube 3 is arranged parallel to the rotation center line B of the permanent magnet 2, the permanent magnet 2 rotates along the horizontal plane, and the center line A of the test tube 3 deviates from the rotation center line B of the permanent magnet 2 by at least 1 mm.

[0024] See attached Figure 3 In order to improve the stirring efficiency, the number of test tubes 3 and permanent magnets 2 is set to be multiple; multiple test tubes 3 are arranged in an array at intervals, and the permanent magnets 2 are set under the corresponding test tubes 3.

[0025] The rotary drive device 1 comprises: a motor 1.1, a transmission belt 1.2, a transmission wheel 1.3 and a transmission shaft 1.4; each permanent magnet 2 is mounted on a transmission shaft 1.4, and the transmission shaft 1.4 is equipped with a transmission wheel 1.3; each transmission wheel 1.3 and the output shaft of the motor 1.1 are driven by the transmission belt 1.2.

[0026] Embodiment 3, based on Embodiment 1, further defines the arrangement of the permanent magnets:

[0027] In this example, the center line A of the test tube 3 is arranged perpendicularly to the rotation center line B of the permanent magnet 2, and the permanent magnet 2 rotates perpendicularly relative to the horizontal plane.

[0028] See attached Figure 4In order to improve the stirring efficiency, the number of test tubes 3 and permanent magnets 2 is multiple; the multiple test tubes 3 are arranged in an array at intervals; the driving device 1 includes: a motor 1.1; multiple permanent magnets 2 are also arranged at intervals on the output shaft of the motor 1.1, and are located at the lower side of the corresponding test tube 3.

[0029] Although the utility model has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims

1. A magnetic stirring system, which include: A permanent magnet (2) rotating under the action of a driving device (1), a test tube (3) placed on a fixed support (5), and a permanent magnetic stirring bar (4) placed in the test tube (3); characterized in that: The permanent magnetic stirrer (4) is a disc-shaped structure, with S and N poles distributed up and down along the thickness direction; the permanent magnet (2) is located at the lower side of the test tube (3); when the permanent magnet rotates, an alternating magnetic field is formed, which drives the permanent magnetic stirrer (4) to rotate tiltedly, thereby stirring the sample in the test tube (3).

2. A magnetic stirring system as claimed in claim 1, Features: The outer layer of the permanent magnet in the permanent magnetic stirrer (4) is wrapped with a corrosion-resistant layer.

3. A magnetic stirring system as claimed in claim 1 or 2, Features: The bottom of the test tube (3) is an arc-shaped structure.

4. A magnetic stirring system as claimed in claim 1 or 2, Features: The center line A of the test tube (3) is parallel to the rotation center line B of the permanent magnet (2), and the center line A of the test tube (3) deviates from the rotation center line B of the permanent magnet (2) by at least 1 mm.

5. A magnetic stirring system as claimed in claim 4, Features: The number of the test tubes (3) and the permanent magnets (2) is multiple; the multiple test tubes (3) are arranged in an array at intervals, and the permanent magnets (2) are arranged at the lower side of the corresponding test tubes (3); The driving device (1) comprises: a motor (1.1), a transmission belt (1.2), a transmission wheel (1.3) and a transmission shaft (1.4); each of the permanent magnets (2) is mounted on a transmission shaft (1.4), and the transmission shaft (1.4) is equipped with the transmission wheel (1.3); transmission is achieved between each of the transmission wheels (1.3) and the output shaft of the motor (1.1) via the transmission belt (1.2).

6. A magnetic stirring system as claimed in claim 1 or 2, Features: The center line A of the test tube (3) is perpendicular to the rotation center line B of the permanent magnet (2).

7. A magnetic stirring system as claimed in claim 6, Features: The number of the test tubes (3) and the permanent magnets (2) is multiple; the multiple test tubes (3) are arranged in an array at intervals; The driving device (1) comprises: a motor (1.1); a plurality of permanent magnets (2) arranged at equal intervals on an output shaft of the motor (1.1) and located below and to the sides of the corresponding test tubes (3).

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