Sleeve type two-stage mixing three-dimensional structure micro mixer

Abstract

The invention discloses a sleeve type two-stage mixing three-dimensional structure micro-mixer, and belongs to the field of micro-channel mixers. The micro-mixer is of a three-dimensional structure and comprises two cylindrical inlets, a cylindrical outlet channel and two main body mixing areas, wherein the two cylindrical inlets are positioned on the same horizontal plane and are parallel to each other; the first-stage main body mixing area adopts sleeve type mixing, the mixing area is an interlayer cavity formed by the outer wall of the inner pipe and the inner wall of the outer pipe, three circles of cylindrical small holes are formed in the pipe wall of the inner pipe, the inner pipe is connected with the first-stage mixing area through the small holes, mixed liquid obtained after primary mixing reaches a funnel-shaped flow gathering groove, and a semi-golf ball structure is arranged at the bottom of the flow gathering groove; a spiral beveled hole is formed in the wall face of the flow gathering groove, mixed liquid impacts on a golf ball to be collided and mixed, then the mixed liquid forms vortex flow through the spiral beveled hole, the vortex flow enters the second-stage mixing area, and finally the mixed liquid flows out of an outlet through the spiral beveled hole. The flow direction of fluid in the mixer is continuously changed through collision mixing of the semi-golf ball body and the spiral beveled holes, and vortex flow is generated to improve the mixing effect.

Description

Technical Field

[0001] The invention relates to the technical field of microchannel reactors, in particular to a sleeve-type two-level mixing three-dimensional structure micro mixer. Background Art

[0002] A micromixer is a new type of microfluidic device, specially designed to achieve efficient mixing of different liquids at the micrometer or nanometer scale. In traditional macro mixers, it is usually difficult to achieve efficient mixing in a small space due to the limitations of fluid dynamics. In contrast, the micromixer has the advantages of high-speed mixing, efficient heat transfer, no amplification effect, and high safety performance due to its unique microchannel size. By limiting the fluid in a tiny channel and utilizing the mixing effect of turbulent or laminar flow, the mixing efficiency can be significantly improved. In practical applications, micromixers are widely used in chemical synthesis, biomedical testing, drug development, and food industry. In particular, in microreactor systems that require precise control of mixing ratios and reaction times, the advantages of micromixers are particularly prominent. With the development of microfabrication technology, the design and application of micromixers are also expanding, becoming an important direction of microfluidic technology research.

[0003] Micromixers are divided into two categories: active micromixers and passive micromixers, depending on whether external energy is added to the mixer. In addition to the energy provided by the pump, active micromixers also require the addition of external energy, such as light field, mechanical force, magnetic field, electric field, etc. to disturb the flow field to achieve the mixing effect. Passive micromixers do not require the addition of external energy except the energy provided by the pump, and mainly promote the mixing effect by changing the geometric structure in the microchannel, such as setting obstacles in the channel.

[0004] Passive micromixers are usually laminar flows. Without special structural design, mixing is mainly carried out in the form of diffusion of the mixture, but the effect is poor. By designing the internal structure of the micromixer to increase the contact area between the mixed liquids, the expected mixing effect can be achieved, effectively promoting liquid-liquid mixing. Summary of the invention

[0005] In order to overcome the defects of the prior art problems, the present invention provides a sleeve-type two-stage mixing three-dimensional structure micro-mixer, which adopts sleeve-type two-stage mixing to strengthen the mixing between liquids. In the first-stage main mixing area, one liquid is horizontally injected into another liquid to achieve preliminary mixing. At the same time, the preliminary mixed liquids converge in the funnel-shaped converging groove. The mixed liquid reaches the bottom of the funnel-shaped converging groove and collides with the semi-golf ball structure. The upper surface of the semi-golf ball structure is uneven, thereby further strengthening the mixing between the liquids; then the mixed liquid forms a vortex flow through the spiral bevel hole to enter the secondary mixing area, and finally flows out from the outlet through the spiral bevel hole.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A sleeve-type two-stage mixing three-dimensional structure micro mixer is a three-dimensional structure, comprising two cylindrical inlets I and II in the same horizontal plane and parallel to each other, a cylindrical outlet channel, a primary main mixing zone and a secondary main mixing zone;

[0008] The primary main mixing zone adopts sleeve mixing, and the mixing area is a sandwich cavity formed by the outer wall of the inner tube and the inner wall of the outer tube. The inner tube wall has three circles of cylindrical small holes, and the cylindrical small holes connect the inner tube with the primary mixing zone. Among them, a funnel-shaped flow collecting groove is opened at the center of the end of the primary main mixing zone, and the bottom is a semi-golf ball structure; the secondary main mixing zone is connected to the primary main mixing zone through a spiral bevel hole, and the central axes of the cylindrical inlet I, the inner tube, the funnel-shaped flow collecting groove, the semi-golf ball structure, and the cylindrical outlet channel are collinear. The diameter of the cylindrical inlet I is set to a, the diameter of the cylindrical inlet II is set to b, the diameter of the cylindrical outlet channel is set to c, the diameter of the cylindrical small hole is set to d, the diameter of the spiral bevel hole I and the spiral bevel hole II of the secondary main mixing zone is set to e, and the inclination angle of the funnel-shaped flow collecting groove is set to α.

[0009] In a preferred embodiment, the number of the cylindrical small holes is set to m, the number m is not less than 3, and the number of the cylindrical small holes in each circle is set to n, 3≤n≤30.

[0010] In a preferred embodiment, the diameter a of the cylindrical inlet I is set to 4 times the diameter b of the cylindrical inlet II, the diameter c of the cylindrical outlet channel is equal to the diameter a of the cylindrical inlet I, and the diameters e of the spiral beveled holes I and spiral beveled holes II are equal to the diameter d of the cylindrical small hole.

[0011] In a preferred embodiment, the diameter of the cylindrical inlet II is b, 0.2mm≤b≤0.5mm.

[0012] In a preferred embodiment, the inclination angle of the funnel-shaped converging groove is set to α, 20°≤α≤30°.

[0013] In a preferred embodiment, the number of the spiral beveled holes I and the number of the spiral beveled holes II are both set to f, 3≤f≤9.

[0014] In a preferred embodiment, the helical height of the spiral beveled hole I and the spiral beveled hole II is set to H, H=2.5 mm; the helical pitch of the spiral beveled hole I and the spiral beveled hole II is set to L, L=4 mm.

[0015] In a preferred embodiment, the directions of the spiral lines of the spiral beveled holes I and II are set to be counterclockwise, and the starting angles of the spiral lines of the spiral beveled holes I and II are set to S, S=45°.

[0016] In a preferred embodiment, the diameter of the half golf ball structure is set to g, 0.6mm≤g≤1.69mm.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention adopts a two-stage mixing structure to continuously improve the liquid-liquid mixing effect, and adopts a three-dimensional sleeve-type stereoscopic structure to increase the contact area of ​​the mixed liquid. At the same time, a semi-golf ball structure is designed at the bottom of the primary main mixing area, and the mixed solution impacts the surface of the semi-golf ball structure. The uneven spherical structure of the semi-golf ball not only reduces the impact of the mixed solution on the bottom of the funnel-shaped converging trough, but also causes chaos between the fluids, aggravates the unbalanced collision between the fluids, and enhances the mixing effect.

[0019] 2. A spiral bevel hole structure is adopted in the secondary main mixing area. When the mixed solution enters the secondary main mixing area from the spiral bevel hole, a vortex flow will be generated, which increases the contact area between the mixtures and promotes effective mixing of the solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of fluid diversion of the present invention;

[0022] Figure 3 It is a schematic diagram of the cutaway structure of the present invention;

[0023] In the figure: 1, cylindrical inlet Ⅰ; 2, cylindrical inlet Ⅱ; 3, primary main mixing zone; 4, cylindrical small hole; 5, funnel-shaped flow collecting groove; 6, spiral bevel hole Ⅰ; 7, half golf ball structure; 8, secondary main mixing zone; 9, spiral bevel hole Ⅱ; 10, cylindrical outlet channel; 11, inner tube; 12, outer tube; DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The present invention provides Figure 1-3 The sleeve-type two-stage mixing three-dimensional structure micro-mixer shown in the figure comprises two cylindrical inlets Ⅰ1 and Ⅱ2 which are in the same horizontal plane and parallel to each other, a cylindrical outlet channel 10, a primary main body mixing zone 3 and a secondary main body mixing zone 8, wherein the cylindrical inlet Ⅰ1 is connected to the primary main body mixing zone 3, and the cylindrical inlet Ⅱ2 is connected to the inner tube 11, and the primary main body mixing zone 3 is a sandwich cavity formed by the outer wall of the inner tube 11 and the inner wall of the outer tube 12, wherein three circles of cylindrical small holes 4 are provided on the inner tube 11, and the three circles of cylindrical small holes 4 connect the inner tube 11 with the primary mixing zone, a funnel-shaped flow collecting groove 5 is provided at the center of the end of the primary main body mixing zone 3, and the bottom is a semi-golf ball structure 7, and the secondary main body mixing zone 8 is connected to the primary main body mixing zone through a spiral bevel hole Ⅰ6, and the central axes of the cylindrical inlet Ⅰ1, the inner tube 11, the funnel-shaped flow collecting groove 5, the semi-golf ball structure 7, and the cylindrical outlet channel 10 are collinear. The diameter of the cylindrical inlet Ⅰ1 is set to a, the diameter of the cylindrical inlet Ⅱ2 is set to b, the diameter of the cylindrical outlet channel 10 is set to c, the diameter of the cylindrical small hole 4 is set to d, the diameters of the spiral beveled holes Ⅰ6 and the spiral beveled holes Ⅱ9 of the secondary main mixing zone 8 are set to e, the inclination angle of the funnel-shaped focusing groove 5 is set to α, and the number of small holes in each circle of the cylindrical small holes 4 is set to n.

[0026] The number of circles of the cylindrical small hole 4 is set to m, and the number m is not less than 3 circles.

[0027] The n is set to 1≤n≤31, preferably 3≤n≤30, the b is set to 0.1mm≤b≤1mm, preferably 0.2mm≤b≤0.5mm, the α is set to 10°≤α≤45°, preferably 20°≤α≤30°, the f is set to 1≤f≤10, preferably 3≤f≤9, the g is set to 0.5mm≤g≤1mm, preferably 0.6mm≤g≤1.69mm, and the diameter a of the cylindrical inlet Ⅰ1 is set to 4 times the diameter b of the cylindrical inlet Ⅱ2, the diameter c10 of the cylindrical outlet channel is equal to the diameter a of the cylindrical inlet Ⅰ1, and the diameter e of the spiral bevel hole Ⅰ6 and the spiral bevel hole Ⅱ9 is equal to the diameter d of the cylindrical small hole 4.

[0028] The working principle of the present invention is as follows: two solutions to be mixed flow in from cylindrical inlet Ⅰ1 and inlet Ⅱ2 respectively at a certain flow rate ratio, the two solutions to be mixed meet and mix in the primary main mixing area 3, the mixed solution then impacts the uneven surface of the semi-golf ball structure 7, enters the secondary main mixing area from the spiral bevel hole Ⅰ6 and generates a vortex flow, and finally, the mixed solution enters the cylindrical outlet channel 10 from the spiral bevel hole Ⅱ9 and flows out.

[0029] In normal use, the solution flows through the channel such as Figure 2 As shown, the direction indicated by the arrow is the fluid flow route.

[0030] It is necessary to explain that: in the embodiments of the present invention, all directional indicators (such as inside, outside, bottom, etc.) are only used to explain the corresponding position relationship of each component under a specific situation (as shown in the drawings). When the situation changes, the corresponding directional words also change accordingly, and when their positions and states conform to the positions described in the present invention, they can be considered to be within the protection scope of the present invention. It cannot be considered that a certain component of the present invention is actually in a unique position. Unless otherwise specified and limited, the terms "connected" and "connected" can be directly connected or indirectly connected, and the "set" and "opened" can be directly set or indirectly set;

[0031] In the diagrams of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0032] The main features, working principles and advantages of the present invention are shown and described above. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. The present invention can be improved and changed without departing from the scope and spirit of the present invention, and these improvements and changes fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A sleeve-type two-stage mixing three-dimensional structure micro mixer, characterized in that: The micro mixer is a three-dimensional structure, comprising two cylindrical inlets I (1) and II (2) located in the same horizontal plane and parallel to each other, a cylindrical outlet channel (10), a primary main mixing zone (3) and a secondary main mixing zone (8); The primary main mixing zone (3) adopts a sleeve-type mixing, and the mixing area is a sandwich cavity formed by the outer wall of the inner tube (11) and the inner wall of the outer tube (12). The inner tube (11) has three circles of cylindrical small holes (4) on its wall, and the cylindrical small holes (4) connect the inner tube (11) with the primary mixing zone (3). A funnel-shaped converging groove (5) is provided at the center of the end of the primary main mixing zone, and the bottom is a semi-golf ball structure (7); the inlet and outlet of the secondary main mixing zone (8) are composed of a spiral beveled hole I (6) and a spiral beveled hole II (9) of the same size, and the spiral beveled hole II (9) of the secondary main mixing zone (8) is The cylindrical outlet channel (10) is connected to the cylindrical outlet channel (10), and the central axes of the cylindrical inlet I (1), the inner tube (11), the funnel-shaped flow collecting groove (5), the semi-golf ball structure (7), and the cylindrical outlet channel (10) are collinear; the diameter of the cylindrical inlet I (1) is set to a, the diameter of the cylindrical inlet II (2) is set to b, the diameter of the cylindrical outlet channel (10) is set to c, the diameter of the cylindrical small hole (4) is set to d, the diameters of the spiral beveled hole I (6) and the spiral beveled hole II (9) of the secondary main mixing zone (8) are set to e, and the inclination angle of the funnel-shaped flow collecting groove (5) is set to α.

2. The sleeve-type two-stage mixing three-dimensional structure micro-mixer according to claim 1 is characterized in that: The number of circles of the cylindrical small holes (4) is set to m, the number m is not less than 3 circles, and the number of small holes in each circle of the cylindrical small holes (4) is set to n, 1≤n≤31.

3. The sleeve-type two-stage mixing three-dimensional structure micro-mixer according to claim 1 is characterized in that: The diameter a of the cylindrical inlet I (1) is set to 4 times the diameter b of the cylindrical inlet II (2), the diameter c of the cylindrical outlet channel (10) is equal to the diameter a of the cylindrical inlet I (1), and the diameter e of the spiral bevel hole I (6) and the spiral bevel hole II (9) is equal to the diameter d of the cylindrical small hole (4).

4. The sleeve-type two-stage mixing three-dimensional structure micro-mixer according to claim 3 is characterized in that: The diameter of the cylindrical inlet II (2) is b, 0.1mm≤b≤1mm.

5. The sleeve-type two-stage mixing three-dimensional structure micro-mixer according to claim 1, characterized in that: The inclination angle of the funnel-shaped converging groove (5) is set to α, 10°≤α≤45°.

6. The sleeve-type two-stage mixing three-dimensional structure micro-mixer according to claim 1, characterized in that: The number of the spiral beveled holes I (6) and the number of the spiral beveled holes II (9) are both set to f, 1≤f≤10.

7. The sleeve-type two-stage mixing three-dimensional structure micro-mixer according to claim 1, characterized in that: The helical height of the spiral beveled hole I (6) and the spiral beveled hole II (9) is set to H, H = 2.5 mm; the helical pitch of the spiral beveled hole I (6) and the spiral beveled hole II (9) is set to L, L = 4 mm.

8. The vortex-type three-dimensional structure micro-mixer for efficient liquid-liquid two-stage mixing according to claim 1, characterized in that: The spiral lines of the spiral beveled hole I (6) and the spiral beveled hole II (9) are arranged in a counterclockwise direction, and the starting angles of the spiral lines of the spiral beveled hole I (6) and the spiral beveled hole II (9) are arranged to be S, S=45°.

9. The vortex-type three-dimensional structure micro-mixer for efficient liquid-liquid two-stage mixing according to claim 1, characterized in that: The diameter of the half golf ball structure (7) is set to g, 0.5mm≤g≤1mm.

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