Magnetically-driven grating ring micro-channel liquid mixing device and method thereof

Abstract

The invention discloses a magnetically-driven grating ring micro-channel liquid mixing device and a method thereof, and relates to a liquid mixing device and a method thereof. Modularized magnetic force driving is adopted, premixed liquid is pre-dispersed and sheared and crushed through a grating structure, a mixing channel adopts a three-stage Archimedes spiral micro-channel design, a liquid inlet channel layer is provided with rectangular-section micro-channels which are annularly and uniformly arranged, a secondary mixing channel layer adopts a spiral channel from the circle center to the periphery, and the spiral channel is formed in the middle of the spiral channel. The tertiary mixing channel layer is a spiral channel from the circumference to the circle center, and efficient mass transfer of two liquids is achieved through the synergistic effect of vortex and shear force induced by a spiral divergent structure. The device has the advantages of modularization, easiness in disassembly and replacement and active mixing, the dispersion uniformity and mixing efficiency of materials in the micro-channel are remarkably improved through the synergistic effect of the magnetically-driven multi-stage mixing units, and the device is suitable for the material mixing processes of strong heat release, rapid reaction and the like in the technical fields of fine chemical engineering, biological medicine and the like.

Description

Technical Field

[0001] The present invention relates to a liquid mixing device and a method thereof, and in particular to a magnetically driven grid ring microchannel liquid mixing device and a method thereof. Background Art

[0002] In the field of chemical engineering, liquid-liquid mixing and reaction are crucial steps in the process. Therefore, there is an urgent need for technologies and devices that enhance liquid-liquid mixing. Traditional passive liquid-liquid mixers are inefficient, and sufficient mixing of the liquid and liquid phases is crucial for improving product quality. This is especially true for conventional microchannel mixing, which suffers from low process efficiency and limited mass transfer. There is room for improvement in reaction efficiency, poor reaction selectivity, and miniaturization. The intersection of microfluidics and chemical reaction engineering requires urgent resolution. Summary of the Invention

[0003] The purpose of the present invention is to provide a magnetically driven grid ring microchannel liquid mixing device and method thereof. The present invention adopts a laboratory-level compact liquid-liquid micro-reaction device and a new method, and realizes the convenience of disassembly and assembly of the device through modular structure optimization. At the same time, the flow channel topology configuration is adopted to enhance the mass transfer process of the two liquids, and ultimately achieves a dual improvement in operation and maintenance convenience and mixing enhancement, which is particularly suitable for frequent maintenance of precise micro-process conditions.

[0004] The present invention adopts the following technical solutions: A magnetically driven grid ring microchannel liquid mixing device, comprising a magnetic wheel cover, an active magnetic wheel, a first feed channel layer, an upper rubber pad, a second feed channel layer, a liquid-liquid primary mixing grid ring, a stirring grid ring, a rubber pad, a secondary mixing channel layer, a lower rubber pad, a tertiary mixing channel layer, bolts, and nuts; the magnetic wheel cover fixes the active magnetic wheel, which is provided with a permanent magnet; the active magnetic wheel shaft is connected to a motor; and a rolling ball is provided at the bottom; The first feeding channel layer is a circular liquid inlet channel, with an arc groove on the top that cooperates with the rolling ball structure to position the active magnetic wheel; an annular groove is provided on the bottom, and a rubber pad is installed on the outside; The second feed channel layer is a square liquid inlet channel with two annular grooves on the upper part for installing the liquid-liquid primary mixing grid ring and stirring ring, and a rolling ball on the lower part; there is a mounting groove at the bottom for installing the rubber pad; The liquid-liquid primary mixing grid ring consists of upper and lower annular parts and a middle grid, which contains four equally spaced permanent magnets; the lower part is equipped with rolling balls, and the annular part cooperates with the liquid flow groove of the feed channel layer, and multiple guide holes are set in the annular area; The central area of ​​the secondary mixing channel layer is a small circular groove, with an annular groove set on the periphery. The microchannels are arranged in a spiral shape, and there are two guide holes on the outside. The circular flow guide hole is in the center of the third mixing channel layer, and the outer part has an annular groove, and a rubber pad is installed outside; The rubber pad is arranged between the first feeding channel layer, the second feeding channel layer, the secondary mixing channel layer and the third mixing channel layer; A kind of magnetic drive grid ring microchannel liquid mixing process method, the method comprises the following steps: (1) fluid input and premixing: liquid is injected from the second feeding channel square inlet, and another liquid is introduced after filling the annular groove; the liquid injected from the second feeding channel square inlet is continuous phase, and another liquid is introduced after filling the annular groove; the active magnetic wheel drives the liquid-liquid initial mixing grid wheel to rotate, the liquid injected from the second feeding channel square inlet flows to another liquid through the flow guide hole above the grid, and the liquid is forced to move towards the center by gravity inertia, forming a liquid-liquid collision interface; (2) dynamic dispersion and shearing: the stirring grid wheel rotates at high speed, cutting the liquid microcluster into smaller scale dispersed phase, significantly increasing the contact area; the mixture passes through the arc-shaped channel into the secondary mixing channel layer, and the spiral microchannel induces radial vortex, strengthening axial mixing; (3) mass transfer optimization of spiral channel: primary spiral segment (center→periphery): material flows in spiral gradually expanding structure to generate axial vortex, and laminar boundary layer is broken, promoting turbulent mixing; secondary spiral segment (periphery→center): reverse spiral design forms a gradient flow field, prolongs the residence time and avoids short-circuit flow; spiral gradually expanding effect: periodic change of channel section induces periodic rupture and recombination of interface, improving microscale mass transfer efficiency; (4) product output: the mixed liquid flows out through the center outlet of the third mixing channel layer, completing the high-efficiency liquid-liquid mixing reaction.

[0005] The beneficial effects of the present application are: 1. The present application is based on the special structure of its channel for efficient mixing, and the device has the characteristics of uniform stirring structure driven by magnetic force, which can ensure that the two liquid phases are fully mixed; the Archimedes spiral microchannel used in the present application solves the problems of low mixing efficiency and limited mass transfer of traditional microchannels through its unique geometric design, and has significant advantages in improving reaction efficiency, controlling reaction selectivity and realizing miniaturization; the combination of Archimedes spiral microchannel and magnetic wheel shows the innovative advantages of the cross field of microfluidic technology and chemical reaction engineering.

[0006] 1. The present application sets up magnetic wheel cover, multi-layer liquid inlet channel layer, liquid-liquid initial mixing grid ring, stirring grid ring and rubber pad, etc., and uses magnetic force to rotate the stirring ring and liquid-liquid initial mixing grid ring without contact, which ensures the sealing of the device, so that the two liquids can be well stirred before entering the microchannel, and the structure of the rotating liquid-liquid initial mixing grid ring can simultaneously distribute and mix multiple components of the two liquids.

[0007] 2. The present application sets up magnetic wheel cover, multi-layer liquid inlet channel layer, liquid-liquid initial mixing grid ring, stirring ring and rubber pad, adopts multiple sets of annular evenly arranged Archimedes spiral microchannels, strengthens the radial mixing of liquid between channels under the condition of same axial distance, reduces mixing time and makes mixing more sufficient. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 It is a front view of the liquid-liquid mixing device of the present application; Figure 2 It is a front view of the liquid-liquid mixing device of the present application; Figure 3 It is a side view of the active magnetic wheel part of the present application; Figure 4 It is a side view of the feed channel layer part of the present application; Figure 5 It is a side view of the liquid-liquid initial mixing grid wheel part of the present application; Figure 6 It is a top view of the secondary mixing channel layer part of the present application.

[0009] In the figure: magnetic wheel cover 1, active magnetic wheel 2, feed channel layer 3, upper rubber pad 4, feed channel layer 5, liquid-liquid initial mixing grid ring 6, stirring grid ring 7, rubber pad 8, secondary mixing channel layer 9, lower rubber pad 10, tertiary mixing channel layer 11, bolt 12, nut 13. DETAILED DESCRIPTION

[0010] The present application will be described in detail below in combination with the embodiments shown in the drawings.

[0011] The present application is a magnetic force driven grid ring microchannel liquid mixing device, which comprises: Magnetic wheel cover and active magnetic wheel: the magnetic wheel cover fixes the active magnetic wheel, the active magnetic wheel has eight permanent magnets thereon, and drives the liquid-liquid initial mixing grid ring and the stirring ring when rotating. The shaft of the active magnetic wheel is connected with the motor, and the lower part is provided with a ball structure to reduce the rotating resistance.

[0012] Feed channel layer 1: this layer has a circular liquid inlet channel, and the top is provided with an arc-shaped groove matched with the rolling ball structure to effectively position the active magnetic wheel. The bottom has an annular groove, and the liquid flows in the groove, and the outer part is provided with a rubber pad to keep the sealing property.

[0013] Feed channel layer 2: it contains a square liquid inlet channel, and the upper part has two annular grooves for installing the liquid-liquid initial mixing grid ring and the stirring ring, and the lower part is provided with a rolling ball structure. The liquid flows through the spiral microchannel and enters the secondary mixing layer, and the bottom has an installation groove for installing a rubber pad.

[0014] Liquid-liquid initial mixing grid ring: composed of upper and lower ring parts and the middle grid, containing four equally spaced permanent magnets. The lower part has a rolling ball structure to reduce the rotational resistance, the ring part is matched with the liquid flow groove of the feed one channel layer, and the ring area is provided with a plurality of flow guide holes to facilitate the introduction of the material into the center position of each grid and another material mixing.

[0015] Stirring ring: similar to the liquid-liquid initial mixing grid ring, used for stirring two liquids to achieve rapid mixing. The rolling ball structure at the bottom can reduce the resistance.

[0016] Secondary mixing channel layer: the central area is a small circular groove, the periphery is provided with an annular groove, the microchannels are arranged in a spiral shape, and the outside has two flow guide holes to make the mixture flow to the tertiary mixing channel layer.

[0017] Tertiary mixing channel layer: similar in structure to the secondary mixing channel layer, with a circular flow guide hole in the center and an annular groove on the outside, the microchannels connecting the two, and a rubber pad installed on the outside.

[0018] Rubber pad: used between the feed one channel layer, the feed two channel layer, the secondary mixing channel layer and the tertiary mixing channel layer to ensure sealing.

[0019] Assembly method: each layer assembly is fixed by bolts and nuts, the screw holes are located at the diagonal positions of the device, ensuring tight combination, good sealing and stability, and facilitating disassembly and cleaning.

[0020] The process of the magnetic drive grid ring microchannel liquid mixing device of the application is as follows: Fluid input and pre-mixing: The liquid is injected from the feed two channel square inlet, and after filling the annular groove, another liquid is introduced. The liquid injected from the feed two channel square inlet is the continuous phase, and after filling the annular groove, another liquid is introduced as the dispersed phase.

[0021] The active magnetic wheel 2 drives the liquid-liquid initial mixing grid wheel 6 to rotate, and the liquid injected from the feed two channel square inlet flows to the other liquid after filling the annular groove through the flow guide hole above the grid, and the gravitational inertia promotes the centripetal motion of the liquid, forming a liquid-liquid collision interface.

[0022] 2. Dynamic dispersion and shearing: The stirring grid wheel 7 rotates at high speed, cutting the liquid clusters into smaller scale dispersed phases, significantly increasing the contact area.

[0023] The mixture enters the secondary mixing channel layer 9 through the arc-shaped channel, and the spiral microchannels induce radial vortexes, strengthening the axial mixing.

[0024] 3. Spiral channel mass transfer optimization: Primary spiral segment (center of circle→periphery): the material flowing in the spiral gradually expanding structure generates axial vortex, and the laminar boundary layer is broken, promoting turbulent mixing.

[0025] Secondary spiral segment (periphery→center of circle): the reverse spiral design forms a gradient flow field, prolongs the residence time and avoids short-circuit flow.

[0026] Spiral expansion effect: periodic changes in the cross section of the channel induce periodic rupture and recombination of the interface, improving microscale mass transfer efficiency.

[0027] 4. Product output: The mixed solution flows out through the center outlet of the three mixing channel layers 11, completing the high-efficiency liquid-liquid mixing reaction. Embodiment

[0028] The device of the application adopts modular magnetic drive, and its core components include a magnetic drive module and a microchannel structure module. The outer motor of the active magnetic wheel in the magnetic module drives the liquid-liquid primary mixing grid wheel and the stirring grid wheel to rotate without contact, and the grid structure is used to pre-disperse and shear the premixed liquid to ensure the sealing of the entire device. The mixing channel adopts a three-stage Archimedes spiral microchannel design, wherein the inlet channel layer is configured with annularly arranged rectangular cross-section microchannels, the secondary mixing channel layer adopts a spiral channel from the center of the circle to the periphery, and the tertiary mixing channel layer is a spiral channel from the periphery to the center of the circle. Through the synergistic effect of vortex and shear force induced by the spiral gradually expanding structure, efficient mass transfer of two liquids is realized.

[0029] The device of the application is sequentially stacked from top to bottom with a magnetic wheel cover 1, an active magnetic wheel 2, an inlet channel layer 3, an inlet channel layer 5, an upper rubber pad 4 for maintaining sealing, a rubber pad 8, and a lower rubber pad 10, a liquid-liquid primary mixing grid ring 6 for starting accelerated mixing, a stirring grid ring 7, a secondary mixing channel layer 9 for realizing full mixing of materials, a tertiary mixing channel layer 11, and a bolt 12 and a nut 13 for fixing the device. The liquid-liquid primary mixing grid ring 6 has an inlet hole above it connected to the inlet channel layer 3 and the inlet channel layer 5, and the center of the inlet channel layer 5 and the secondary mixing channel layer 9 is provided with an outlet hole connected to the next layer, so that the mixture enters different channels for mixing in sequence, and finally the mixture flows out from the center outlet hole of the tertiary mixing channel layer 11. The rotation directions of the channels in each layer are different.

[0030] The active magnetic wheel 2 of the microchannel mixing device of the application has eight permanent magnets, which drive the liquid-liquid primary mixing grid ring 6 and the stirring grid ring 7 to rotate, and the bottom ball bearings effectively reduce the resistance loss.

[0031] The micro-channel mixing device has a two-channel layer 5 for placing a liquid-liquid primary mixing grid ring 6 and a stirring grid ring 7, and a central circular area has a plurality of Archimedes spiral liquid-liquid mixing micro-channels arranged uniformly in a ring direction, and the channel section is rectangular, and a flow guide hole is arranged in the central area.

[0032] The two-channel layer 5 of the micro-channel mixing device is provided with the liquid-liquid primary mixing grid ring 6 and the stirring grid ring 7, and the magnetic wheel 2 drives the two primary mixing grid rings 6 and the stirring grid ring 7 to rotate, the liquid-liquid primary mixing grid ring 6 and the stirring grid ring 7 are similar in structure, but the grid of the liquid-liquid primary mixing grid ring 6 is larger and is closely matched with the ring groove of the two-channel layer 5, and an inlet is arranged on the upper part of the grid for introducing liquid, and the grid of the stirring grid ring 7 is smaller, and the liquid-liquid primary mixing grid ring 6 and the stirring grid ring 7 have a rolling structure in the form of a ball, which effectively reduces the resistance loss during rotation. The liquid-liquid primary mixing grid ring 6 and the stirring grid ring 7 have four grids, which are composed of permanent magnets and are the force points for rotation.

[0033] The secondary mixing channel layer 9 and the tertiary mixing channel layer 11 of the micro-channel mixing device both have a plurality of Archimedes spiral multi-material mixing channels arranged uniformly in a ring direction, the micro-channels of the secondary mixing channel layer 9 are from the center to the periphery, and an annular groove is arranged at the end of the channel, and the groove bottom has two flow guide holes; and the micro-channels of the tertiary mixing channel layer 11 are from the periphery to the center, and the number of the micro-channels of the two channel layers is the same, the channel section is rectangular, and the tertiary mixing channel layer 11 is provided with a material outlet hole in the center, and the uniformly mixed material flows out from the hole.

[0034] The micro-channel mixing device has rubber pads 4, 8 and a lower rubber pad 10, and the structures of the rubber pads are different according to the positions of the flow guide holes of the two-channel layer 5, the secondary mixing channel layer 9 and the tertiary mixing channel layer 11.

[0035] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the patent concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A magnetically driven grid ring microchannel liquid mixing device, characterized in that: The device comprises a magnetic wheel cover (1), an active magnetic wheel (2), a first feed channel layer (3), an upper rubber pad (4), a second feed channel layer (5), a liquid-liquid primary mixing grid ring (6), a stirring grid ring (7), a rubber pad (8), a secondary mixing channel layer (9), a lower rubber pad (10), a tertiary mixing channel layer (11), bolts (12), and nuts (13); the magnetic wheel cover fixes the active magnetic wheel, a permanent magnet is provided on the active magnetic wheel, the active magnetic wheel shaft is connected to the motor, and a rolling ball is provided at the bottom; the first feed channel layer is a circular liquid inlet channel, an arc groove is provided on the top that matches the rolling ball structure, and the active magnetic wheel is positioned; an annular groove is provided at the bottom, and a rubber pad is installed on the outside; the second feed channel layer is a square liquid inlet channel. The channel is provided with two annular grooves on the upper part for installing the liquid-liquid primary mixing grid ring and the stirring ring, and the lower part is provided with rolling balls; the bottom has a mounting groove for installing rubber pads; the liquid-liquid primary mixing grid ring consists of upper and lower annular parts and a grid in the middle, and contains four equidistant permanent magnets; the lower part is provided with rolling balls, and the annular part cooperates with the liquid flow groove of the feed channel layer, and multiple guide holes are arranged in the annular area; the central area of ​​the secondary mixing channel layer is a small circular groove, and an annular groove is arranged on the periphery. The microchannels are arranged in a spiral shape, and two guide holes are provided on the outside; the tertiary mixing channel layer has a circular guide hole in the center, an annular groove on the outside, and a rubber pad is installed on the outside; the rubber pad is arranged between the feed channel layer, the feed channel layer, the secondary mixing channel layer and the tertiary mixing channel layer.

2. A magnetically driven grid ring microchannel liquid mixing process, characterized in that: The method comprises the following steps: (1) Fluid input and premixing: Liquid is injected from the square inlet of the second feed channel, and is introduced into another liquid after filling the annular groove; the liquid injected from the square inlet of the second feed channel is a continuous phase, and is introduced into another liquid after filling the annular groove as a dispersed phase; the active magnetic wheel (2) drives the liquid-liquid premixing grid wheel (6) to rotate, and the liquid injected from the square inlet of the second feed channel flows through the guide holes above the grid until it fills the annular groove and is introduced into another liquid. The gravity inertia causes the liquid to move centripetally, forming a liquid-liquid collision interface; (2) Dynamic dispersion and shearing: The stirring grid wheel (7) rotates at high speed, cutting the liquid micro-clusters into smaller-scale dispersed phases, significantly increasing the contact area; the mixture enters the secondary mixing channel layer (9) through the arc channel, and the spiral microchannel induces radial vortexes, enhancing axial mixing; (3) Mass transfer optimization of spiral channels: Primary spiral segment (center → periphery): The material flows in the spiral expansion structure to generate axial vortex, which breaks the laminar boundary layer and promotes turbulent mixing; Secondary spiral segment (periphery → center): The reverse spiral design forms a gradient velocity field, prolongs the residence time and avoids short-circuit flow; Spiral expansion effect: The periodic change of the channel cross section induces periodic rupture and reorganization of the interface, thereby improving the microscopic mass transfer efficiency; (4) Product output: The mixed liquid flows out through the central outlet of the tertiary mixing channel layer (11), completing the efficient liquid-liquid mixing reaction.

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