A stirring device for preparing formulations in small containers

Abstract

This utility model relates to the field of chemical equipment technology, and in particular to a stirring device for preparing small containers. It includes: a bottle body with a volume of 250ml to 1L; a sealing cap with a threaded connection to the bottle body and a PTFE gasket at the connection point; and a magnetic stirring rod, one end of which is embedded in the sealing cap and the other end of which is embedded in the bottom of the bottle body. The magnetic stirring rod includes a permanent magnet rod and an inert coating layer covering the permanent magnet rod. This stirring device employs a double-sealing structure with a threaded connection between the bottle body and the sealing cap, combined with a PTFE gasket, achieving zero solvent evaporation. It is particularly suitable for preparing volatile, toxic, or corrosive materials. Simultaneously, the inert coating layer on the magnetic stirring rod prevents contamination of the material by the permanent magnet and can withstand high temperatures and chemical corrosion conditions, thus broadening its applicability.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, and in particular to a stirring device for preparing small containers. Background Technology

[0002] In laboratory settings such as chemical experiments, pharmaceutical research and development, food testing, and materials science, the storage, mixing, and sample pretreatment of small-volume materials are frequent operations, typically relying on pressure-resistant steel cylinders with a volume of 250–500 mL. These operations involve extensive physical mixing requirements such as solvent dilution, material homogenization, and system emulsification, and the mixing efficiency and safety directly impact experimental accuracy and progress. However, existing mixing technologies have significant shortcomings, failing to meet the core requirements of high efficiency, airtight sealing, and stability.

[0003] Traditional mixing methods are mainly divided into three categories: The first is the mechanical vibration method, which uses external force to vibrate the entire cylinder to achieve material mixing. However, this method has extremely low mixing efficiency for poorly soluble solid materials (such as lithium difluorophosphate), often requiring more than 60 minutes to completely dissolve, which seriously restricts the experimental progress. The second is the scheme of using an external magnetic stirrer with a stir bar. The stir bar is prone to adhering to the cylinder wall due to the unstable magnetic field, losing its stirring function. Under high pressure or high speed conditions, it is easy to break away from the magnetic field control, resulting in mixing failure. At the same time, the frequent collision between the stir bar and the inner wall of the cylinder can scratch the cylinder body, and the detached impurities directly contaminate the material, affecting the quality of the finished product. The third is the built-in fixed stirring structure. Some improved solutions attempt to integrate the stirring mechanism inside the cylinder, but its drawbacks are also obvious: If welding or fixing the magnetic block is used, the magnetic block cannot form an effective eddy current because it is fixed to the bottom of the cylinder, resulting in poor mixing effect. Moreover, the heat-affected zone generated by welding will reduce the corrosion resistance of the cylinder. If a suspended stir bar is used, although it improves flexibility to a certain extent, the complex structure leads to a surge in manufacturing costs, and it is prone to noise and displacement during transportation or shaking, resulting in insufficient stability.

[0004] Based on this, a novel stirring device for preparing small containers has been developed in this utility model to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a stirring device for preparing small containers. This device features a double-sealing structure where the bottle body and sealing cap are connected by threads and fitted with PTFE gaskets, achieving zero solvent evaporation. It is particularly suitable for preparing volatile, toxic, or corrosive materials. Simultaneously, the inert coating on the magnetic stirring rod prevents contamination of materials by the permanent magnet and allows it to withstand high temperatures and chemical corrosion, broadening its applicability. Furthermore, the magnetic stirring rod's ends are embedded in the sealing cap and the bottom of the bottle body to form an axially fixed rotating structure, ensuring that the rotation axis is highly aligned with the bottle's central axis, thus solving the problem of traditional stir bar misalignment and collision with the bottle wall.

[0006] This utility model adopts the following technical solution: a stirring device for preparing small containers, comprising:

[0007] The bottle body has a volume of 250ml to 1L;

[0008] A sealing cap is threadedly connected to the bottle body, and a PTFE gasket is provided at the connection between the sealing cap and the bottle body;

[0009] A magnetic stirring rod, one end of which is embedded in the sealing cap and the other end of which is embedded in the bottom of the bottle, the magnetic stirring rod including a permanent magnet rod and an inert coating layer covering the outside of the permanent magnet rod.

[0010] Furthermore, the permanent magnet rod is made of sintered NdFeB permanent magnet material of grade N35 to N52, and is uniformly magnetized along the axial direction, with a surface residual magnetic flux density ≥1200 Gauss.

[0011] Furthermore, the inert coating layer is made of polyetheretherketone or polytetrafluoroethylene.

[0012] Furthermore, the outer wall surface of the magnetic stirring rod is provided with 3 to 6 guide vanes, which are arranged spirally along the circumferential direction of the magnetic stirring rod.

[0013] Furthermore, the twist angle of the guide vane is 10° to 20°, and the wing height of the guide vane is 3mm to 5mm.

[0014] Furthermore, the bottom of the bottle is provided with a hemispherical groove, and the bottom of the magnetic stirring rod is a hemispherical protrusion. The hemispherical protrusion at the bottom of the magnetic stirring rod is fitted into the hemispherical groove to form a self-centering rotating pair.

[0015] Furthermore, the top periphery of the hemispherical groove at the bottom of the bottle extends toward the magnetic stirring rod to form an annular limiting protrusion.

[0016] Furthermore, a buffer pad layer is provided on the side of the annular limiting boss facing the hemispherical boss.

[0017] Furthermore, the buffer pad layer is made of silicone or fluororubber material.

[0018] Furthermore, the bottle body is made of 304 stainless steel.

[0019] Compared with related technologies, the beneficial effects of this utility model are as follows:

[0020] This invention relates to a stirring device for small container preparation. The bottle body and sealing cap are connected by threads for easy and quick opening and closing, facilitating material filling and sampling. Combined with a double-sealing structure using a PTFE gasket, it achieves zero solvent evaporation, making it particularly suitable for preparing volatile, toxic, or corrosive materials. The PTFE material is chemically inert and can withstand various organic solvents and extreme acid and alkali environments. Simultaneously, the threaded connection ensures that the device maintains good sealing performance under pressure conditions of ≥0.3MPa, avoiding the risk of leakage under high pressure.

[0021] Designed for small volumes from 250ml to 1L, the overall structure is simple, requiring no complex external drive components, and can be directly adapted to conventional magnetic stirrers. The inert coating on the outside of the magnetic stirring rod not only prevents contamination of materials by the permanent magnet, but also withstands high-temperature and chemically corrosive conditions, broadening its applicability.

[0022] Meanwhile, the magnetic stirring rod is embedded at both ends of the sealing cap and the bottom of the bottle to form an axially fixed rotating structure, ensuring that the rotation axis is highly coincident with the central axis of the bottle. This solves the problem of traditional stir bar being prone to deviation and collision with the bottle wall. Combined with the strong magnetic properties of the permanent magnet rod, it can stably generate efficient eddies at speeds of 200 to 1500 rpm. The mixing effect of high viscosity liquids or sparingly soluble solid materials (such as lithium difluorophosphate) is better than that of traditional oscillation or suspension stirring.

[0023] In addition, the embedded design of the magnetic stirring rod requires no additional fixing parts, making disassembly and cleaning convenient. The smooth surface of the inert coating reduces material residue and can maintain good stirring performance for a long time, reducing maintenance costs and operational complexity. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the stirring device used for preparing small containers in a specific embodiment of the present invention;

[0026] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0027] Figure 3 In order to be in Figure 1 A schematic diagram of the structure after adding guide vanes to a magnetic stirring rod;

[0028] In the figure: bottle body 1, hemispherical groove 10, annular limiting boss 11, buffer pad layer 12, sealing cap 2, magnetic stirring rod 3, guide vane 30, hemispherical boss 31. Detailed Implementation

[0029] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] The following is in conjunction with the appendix Figure 1 The appendix Figure 3 The present invention will be described in detail with specific embodiments:

[0031] like Figures 1 to 3 As shown, this utility model provides a stirring device for preparing small containers, which includes:

[0032] Bottle 1 has a volume of 250ml to 1L, which is mainly for small container preparation; in this embodiment, bottle 1 is made of 304 stainless steel and has a pressure resistance of ≥0.3Mpa.

[0033] A sealing cap 2 is threadedly connected to the bottle body 1, and a PTFE gasket is provided at the connection between the sealing cap 2 and the bottle body 1;

[0034] A magnetic stirring rod 3 is provided, with one end embedded in the sealing cap 2 and the other end embedded in the bottom of the bottle body 1. The magnetic stirring rod 3 includes a permanent magnet rod and an inert coating layer covering the permanent magnet rod. In this embodiment, the inert coating layer can be made of PEEK (polyether ether ketone) or PTFE (polytetrafluoroethylene). Both have excellent chemical inertness. PTFE is resistant to almost all strong acids, strong alkalis, and organic solvents (such as acetone and DMSO), while PEEK can withstand most organic solvents and moderately strong acids and alkalis. PEEK effectively prevents direct contact between the permanent magnet and the material, avoiding corrosion of the magnet material (such as neodymium iron boron) or contamination of the material, ensuring the purity of the formulation. Simultaneously, PEEK can withstand high-temperature environments ≤250℃, suitable for scenarios requiring heating and stirring, while PTFE exhibits stable performance within a temperature range of -200℃ to 260℃, meeting the requirements for wide-temperature operation. Preferably, the diameter of the magnetic stirring rod 3 is ≤ one-third of the inner diameter of the bottle body 1 to avoid collision with the bottle wall.

[0035] This invention relates to a stirring device for small container preparation. The bottle body 1 and the sealing cap 2 are connected by threads, facilitating quick opening and closing, and convenient material filling and sampling. Combined with a double-sealing structure using a PTFE gasket, it achieves zero solvent evaporation, making it particularly suitable for preparing volatile, toxic, or corrosive materials. The PTFE material is chemically inert and can withstand various organic solvents and extreme acid and alkali environments. Simultaneously, the threaded connection ensures that the device maintains good sealing performance under pressure conditions ≥0.3MPa, avoiding the risk of leakage under high pressure.

[0036] Designed for small volumes from 250ml to 1L, the overall structure is simple, requiring no complex external drive components, and can be directly adapted to conventional magnetic stirrers. The inert coating on the outside of the magnetic stirring rod 3 not only prevents contamination of materials by the permanent magnet, but also withstands high-temperature and chemically corrosive conditions, thus broadening its application range.

[0037] Meanwhile, the magnetic stirring rod 3 is embedded at both ends of the sealing cap 2 and the bottom of the bottle body 1 to form an axially fixed rotating structure, ensuring that the rotation axis is highly coincident with the central axis of the bottle body. This solves the problem of traditional stir bar being prone to deviation and collision with the bottle wall. Combined with the strong magnetic properties of the permanent magnet rod, it can stably generate efficient eddies at speeds of 200 to 1500 rpm. The mixing effect of high viscosity liquids or sparingly soluble solid materials (such as lithium difluorophosphate) is better than that of traditional oscillation or suspension stirring.

[0038] In addition, the embedded design of the magnetic stirring rod 3 eliminates the need for additional fixing parts, making disassembly and cleaning convenient. The smooth surface of the inert coating reduces material residue and maintains good stirring performance over a long period, reducing maintenance costs and operational complexity.

[0039] Specifically, in this embodiment, the permanent magnet rod uses sintered NdFeB permanent magnet material of grade N35 to N52, with a surface remanent magnetic flux density ≥1200 Gauss, and is uniformly magnetized along the axial direction, that is, magnetized along the axial direction of the permanent magnet rod, so that the magnetic field distribution is regular and symmetrical, ensuring stable coupling with the driving magnetic field of the external magnetic stirrer, avoiding rotational jamming or loss of synchronization caused by magnetic field disturbance, and ensuring that the stirring rod always runs smoothly at a speed of 200-1500 rpm.

[0040] The permanent magnet rod uses sintered NdFeB permanent magnet material of grade N35-N52. With its high magnetic energy product of 35-52 MGOe, it can provide a strong and stable magnetic foundation, ensuring strong magnetic adsorption force. The appropriate grade can be flexibly selected according to the viscosity of the material (such as high viscosity liquid or insoluble solid), ensuring that the driving force and mixing requirements are precisely matched.

[0041] The surface remanent magnetic flux density of ≥1200 Gauss ensures a sufficiently strong magnetic field penetration force, which can effectively penetrate the bottle and form a linkage with the external stirrer. It can also maintain sufficient driving force under high pressure (≥0.3MPa) or high viscosity environment, preventing the stirring rod from slipping or stopping due to insufficient magnetic force, thus significantly improving mixing efficiency and stability.

[0042] Furthermore, in some specific embodiments, 3 to 6 guide vanes 30 can be provided on the outer wall surface of the magnetic stirring rod 3. The guide vanes 30 are arranged in a spiral along the circumferential direction of the magnetic stirring rod 3. The number of 3 to 6 vanes balances the fluid disturbance intensity and resistance, avoiding mixing dead zones due to too few vanes or excessive increase in rotational resistance.

[0043] Specifically, the twist angle of the guide vane 30 is 10° to 20°, and the vane height is 3mm to 5mm. When the spiral guide vane 30 rotates with the stirring rod, it can form a directional axial and radial composite fluid motion—the twist angle design causes the fluid to generate spiraling upward or downward vortices while being pushed, and the vane height ensures effective disturbance of materials at different depths. Compared to a smooth stirring rod without guide vanes, it can significantly increase the shearing and convection between materials, especially for high-viscosity liquids or systems containing sparingly soluble solids (such as lithium difluorophosphate mixtures), significantly shortening the time to achieve uniform mixing and improving stirring efficiency.

[0044] Furthermore, in some more specific embodiments, the bottom of the bottle body 1 is provided with a hemispherical groove 10, and the bottom of the magnetic stirring rod 3 is a hemispherical protrusion 31. The hemispherical protrusion 31 at the bottom of the magnetic stirring rod 3 is fitted into the hemispherical groove 10, forming a self-centering rotating pair, reducing the frictional resistance with the bottom of the bottle body 1. In this embodiment, the size of the hemispherical groove 10 is slightly larger than the size of the hemispherical protrusion 31, limiting the horizontal offset of the magnetic stirring rod 3 and preventing it from detaching from the driving magnetic field during high-speed rotation.

[0045] Meanwhile, the fitting structure of the hemispherical boss 31 and the hemispherical groove 10 adopts curved surface contact. The curved surface fit has self-centering characteristics, which can automatically correct the slight deviation when the magnetic stirring rod 3 rotates, ensuring that the magnetic stirring rod 3 always takes the central axis of the bottle body 1 as the center of rotation, avoiding the aggravation of local friction caused by eccentricity, and ensuring uniform and stable friction resistance.

[0046] In addition, the spherical contact can convert the sliding friction of the magnetic stirring rod 3 during rotation into a partial rolling friction effect. Combined with the low coefficient of friction of the inert coating layer (PEEK or PTFE), it further reduces mechanical loss.

[0047] More specifically, an annular limiting boss 11 can be formed by extending the top periphery of the hemispherical groove 10 at the bottom of the bottle body 1 towards the magnetic stirring rod 3. The annular limiting boss 11 can provide axial constraint on the hemispherical boss 31 at the bottom of the magnetic stirring rod 3. When the magnetic stirring rod 3 is axially deviated due to high-speed rotation (such as 1000-1500 rpm) or material impact, the annular limiting boss 11 prevents it from falling out, ensuring a stable stirring process.

[0048] Meanwhile, a buffer pad layer 12 can be provided on the side of the annular limiting boss 11 facing the hemispherical boss 31. The buffer pad layer 12 can absorb the impact force generated by the collision between the magnetic stirring rod 3 and the annular limiting boss 11 due to slight axial displacement when rotating at high speed (e.g., 200-1500 rpm), transforming rigid contact into elastic buffering, significantly reducing wear between the bottle body 1 and the inert coating layer (magnetic stirring rod 3), avoiding scratches or debris, and especially protecting the integrity of the coating layer of the magnetic stirring rod 3, preventing material contamination.

[0049] In addition, the buffer pad layer 12 can effectively attenuate the vibration and noise generated by the collision. Direct contact with traditional metal or hard materials can easily generate harsh noise due to high-frequency collisions, while the elastic pad can absorb vibration energy through its own deformation, making the stirring process quieter and improving the laboratory operating environment.

[0050] In this embodiment, the buffer pad layer 12 can be made of silicone or fluororubber. Both silicone and fluororubber have good chemical stability, are resistant to organic solvents, and have a wide temperature range (silicone -60℃ to 200℃, fluororubber -20℃ to above 200℃). They are compatible with corrosive or high-temperature material environments handled by the device and will not swell, age, or degrade in performance due to contact with materials, ensuring that the buffering effect is maintained even after long-term use.

[0051] The stirring device for preparing small containers according to this utility model has the following general working process:

[0052] 1) Filling the solvent: Inject the liquid to be mixed through the sealing cap 2.

[0053] 2) Start stirring: Place the stirring device on the magnetic stirrer and adjust the speed to 200-1500 rpm.

[0054] 3) Mixing process: The external magnetic field drives the magnetic stirring rod 3 to rotate, and the guide vane 30 generates turbulence to accelerate solvent mixing.

[0055] 4) Take out the sample: Unscrew the sealing cap 2 and take out the well mixed solvent directly.

[0056] The applicant manufactured two sets of mixing devices using different materials for the aforementioned mixing device.

[0057] A stirring device is designed for common organic solvents. The bottle is made of 304 stainless steel. The magnetic stirring rod 3 is an N42 neodymium magnet with a diameter of Φ1 cm and a PEEK inert coating. The guide vanes 30 are set with 4 blades and a 15° twist angle.

[0058] Mixing effect: 50% ethanol-water system, homogenization achieved in 30 seconds.

[0059] The second stirring device is mainly for refractory solids. It uses a bottle made of 304 stainless steel. The magnetic stirring rod 3 is an N52 neodymium magnet with a diameter of Φ2 cm and is coated with PTFE inert material. The guide vanes 30 are set with 6 blades and have a 20° twist angle.

[0060] Mixing effect: Organic solvent - lithium difluorophosphate (1:0.05), uniformity is achieved in 30 minutes.

[0061] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. A stirring device for preparing ingredients in small containers, characterized in that: It includes: The bottle body has a volume of 250ml to 1L; A sealing cap is threadedly connected to the bottle body, and a PTFE gasket is provided at the connection between the sealing cap and the bottle body; A magnetic stirring rod, one end of which is embedded in the sealing cap and the other end of which is embedded in the bottom of the bottle, the magnetic stirring rod including a permanent magnet rod and an inert coating layer covering the outside of the permanent magnet rod.

2. The stirring device for preparing small containers according to claim 1, characterized in that: The permanent magnet rod is made of sintered NdFeB permanent magnet material of grade N35 to N52, and is uniformly magnetized along the axial direction, with a surface residual magnetic flux density ≥1200 Gauss.

3. The stirring device for preparing small containers according to claim 1, characterized in that: The inert coating layer is made of polyetheretherketone or polytetrafluoroethylene.

4. The stirring device for preparing small containers according to claim 1, characterized in that: The outer wall of the magnetic stirring rod is provided with 3 to 6 guide vanes, which are arranged spirally along the circumferential direction of the magnetic stirring rod.

5. The stirring device for preparing small containers according to claim 4, characterized in that: The twist angle of the guide vane is 10° to 20°, and the height of the guide vane is 3mm to 5mm.

6. The stirring device for preparing small containers according to claim 1, characterized in that: The bottom of the bottle is provided with a hemispherical groove, and the bottom of the magnetic stirring rod is a hemispherical protrusion. The hemispherical protrusion at the bottom of the magnetic stirring rod is fitted into the hemispherical groove to form a self-centering rotating pair.

7. The stirring device for preparing small containers according to claim 6, characterized in that: The top periphery of the hemispherical groove at the bottom of the bottle extends toward the magnetic stirring rod to form an annular limiting protrusion.

8. The stirring device for preparing small containers according to claim 7, characterized in that: The annular limiting boss has a buffer pad layer on the side facing the hemispherical boss.

9. The stirring device for preparing small containers according to claim 8, characterized in that: The cushioning pad layer is made of silicone or fluororubber.

10. The stirring device for preparing small containers according to claim 1, characterized in that: The bottle body is made of 304 stainless steel.

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