Double-walled two-stage mixed three-dimensional structure micro-mixer

Abstract

The application discloses a sleeve type two-stage mixed three-dimensional structure micro-mixer and belongs to the field of micro-channel mixers. The micro-mixer is a three-dimensional structure, comprising two cylindrical inlets in the same horizontal plane and parallel to each other, a cylindrical outlet channel and two main mixing zones. The first main mixing zone adopts sleeve type mixing, and the mixing area is a sandwich cavity formed by the outer wall of an inner tube and the inner wall of an outer tube. The inner tube wall has three circles of cylindrical small holes, and the small holes connect the inner tube with the first mixing zone. After one-time mixing, the mixed liquid reaches a funnel-shaped flow collector. The bottom of the flow collector has a half golf ball structure, and the wall surface of the flow collector has a spiral inclined hole. The mixed liquid impacts on the golf ball, collides and mixes, and then forms a vortex flow through the spiral inclined hole into the second mixing zone. Finally, the mixed liquid flows out from the outlet through the spiral inclined hole. The fluid in the mixer changes the flow direction through the collision and mixing of the half golf ball and the spiral inclined hole, generates a vortex flow and improves the mixing effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of micro-channel reactor, in particular to a sleeve type secondary mixing three-dimensional structure micro-mixer. BACKGROUND

[0002] The micro-mixer is a new type of micro-fluidic device specially designed for efficient mixing of different liquids at the micron 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 micro-mixer has the advantages of high-speed mixing, high-efficiency heat transfer, no amplification effect, and high safety performance, etc. by virtue of its unique micro-channel size. By restricting the fluid in a small channel and utilizing the mixing effect of turbulent or laminar flow, the mixing efficiency can be significantly improved. In practical applications, micro-mixers are widely used in chemical synthesis, biomedical detection, drug development, food industry and other fields. Especially in micro-reactor systems that require precise control of mixing ratio and reaction time, the advantages of micro-mixers are particularly prominent. With the development of micro-manufacturing technology, the design and application of micro-mixers are also expanding, becoming an important direction of micro-fluidic technology research.

[0003] According to whether the mixer has external energy added, the micro-mixer can be divided into two categories: active micro-mixer and passive micro-mixer. In addition to the energy provided by the pump, the active micro-mixer also needs external energy such as light field, mechanical force, magnetic field, electric field, etc. to disturb the flow field to achieve mixing effect. In addition to the energy provided by the pump, the passive micro-mixer does not need external energy added, mainly by changing the geometry of the micro-channel to promote mixing effect, such as setting obstacles in the channel, etc.

[0004] The passive micro-mixer is usually laminar flow, and in the absence of special structural design, it mainly mixes in the form of diffusion of the mixture, but the effect is poor. By designing the internal structure of the micro-mixer to increase the contact area between the mixed liquids, the expected mixing effect can be achieved, effectively promoting liquid-liquid mixing. SUMMARY

[0005] In order to overcome the defects of the prior art, the present application provides a sleeve type secondary mixing three-dimensional structure micro-mixer, which uses sleeve type secondary mixing to strengthen the mixing between liquids. In the primary mixing zone, a kind of liquid is injected transversely into another liquid to achieve preliminary mixing, and the preliminarily mixed liquid is gathered in the funnel-shaped flow collector. The mixed liquid reaches the bottom of the funnel-shaped flow collector 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 liquids. Then the mixed liquid forms a vortex flow through the spiral inclined hole into the secondary mixing zone, and finally flows out from the outlet through the spiral inclined hole.

[0006] To achieve the above object, the technical scheme adopted by the present application is:

[0007] The sleeve type two-stage mixed 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 first-stage main mixing zone and a second-stage main mixing zone.

[0008] The first-stage main mixing zone adopts sleeve type 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 first-stage mixing zone. A funnel-shaped flow collection groove is arranged at the center of the end of the first-stage main mixing zone, and the bottom is a half-height golf ball structure. The second-stage main mixing zone is connected with the first-stage main mixing zone through spiral slanting holes, and the central axes of the cylindrical inlet I, the inner tube, the funnel-shaped flow collection groove, the half-height golf ball structure and the cylindrical outlet channel are collinear. The diameter of the cylindrical inlet I is set as a, the diameter of the cylindrical inlet II is set as b, the diameter of the cylindrical outlet channel is set as c, the diameter of the cylindrical small hole is set as d, the diameters of the spiral slanting hole I and the spiral slanting hole II of the second-stage main mixing zone are set as e, and the inclination angle of the funnel-shaped flow collection groove is set as a.

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

[0010] In a preferred scheme, the diameter a of the cylindrical inlet I is set as 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 slanting hole I and the spiral slanting hole II are equal to the diameter d of the cylindrical small hole.

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

[0012] In a preferred scheme, the inclination angle a of the funnel-shaped flow collection groove is set as 20°≤a≤30°.

[0013] In a preferred scheme, the number of the spiral slanting hole I and the spiral slanting hole II is set as f, and 3≤f≤9.

[0014] In a preferred scheme, the height of the spiral line of the spiral slanting hole I and the spiral slanting hole II is set as H, and H=2.5mm. The pitch of the spiral line of the spiral slanting hole I and the spiral slanting hole II is set as L, and L=4mm.

[0015] In a preferred scheme, the spiral line direction of the spiral chamfer hole I and the spiral chamfer hole II is set as counterclockwise, and the spiral line starting angle of the spiral chamfer hole I and the spiral chamfer hole II is set as S, S = 45°.

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

[0017] Compared with the prior art, the beneficial effects of the present application are:

[0018] 1. The present application uses a two-stage mixed structure to continuously improve the liquid-liquid mixing effect, and uses a three-dimensional sleeve type three-dimensional structure to increase the contact area of the mixed liquid. Meanwhile, a half golf ball structure is designed at the bottom of the first main mixing area, and the mixed solution impacts on the surface of the half golf ball structure. The uneven spherical structure of the half golf ball not only reduces the impact of the mixed solution on the bottom of the funnel-shaped flow collector, but also causes chaotic phenomena between the fluids, intensifies the unbalanced collision between the fluids, and enhances the mixing effect.

[0019] 2. A spiral chamfer hole structure is used in the second main mixing area. When the mixed solution enters the second main mixing area from the spiral chamfer hole, vortex flow is generated, the contact area between the mixed solutions is increased, and the effective mixing of the solutions is promoted. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 It is a three-dimensional overall structure diagram of the present application;

[0021] Fig. 2 It is a fluid guide diagram of the present application;

[0022] Fig. 3 It is a cut structure diagram of the present application;

[0023] In the figure: 1, cylindrical inlet I; 2, cylindrical inlet II; 3, first main mixing area; 4, cylindrical small hole; 5, funnel-shaped flow collector; 6, spiral chamfer hole I; 7, half golf ball structure; 8, second main mixing area; 9, spiral chamfer hole II; 10, cylindrical outlet passage; 11, inner tube; 12, outer tube; DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0025] The present application providesFigs. 1-3 The sleeve type secondary mixed three-dimensional structure micro-mixer comprises two cylindrical inlets I1 and II2 in the same horizontal plane and parallel to each other, a cylindrical outlet channel 10, a primary main mixing area 3 and a secondary main mixing area 8, the cylindrical inlet I1 is communicated with the primary main mixing area 3, the cylindrical inlet II2 is communicated with the inner tube 11, the primary main mixing area 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 arranged on the inner tube 11, the three circles of cylindrical small holes 4 connect the inner tube 11 with the primary mixing area, a funnel-shaped flow collecting groove 5 is arranged at the center of the end of the primary main mixing area 3, the bottom is a half golf ball structure 7, the secondary main mixing area 8 is connected with the primary main mixing area through a spiral inclined hole I6, the center axes of the cylindrical inlet I1, the inner tube 11, the funnel-shaped flow collecting groove 5, the half golf ball structure 7 and the cylindrical outlet channel 10 are collinear. The diameter of the cylindrical inlet I1 is a, the diameter of the cylindrical inlet II2 is b, the diameter of the cylindrical outlet channel 10 is c, the diameter of the cylindrical small hole 4 is d, the diameters of the spiral inclined hole I6 and the spiral inclined hole II9 of the secondary main mixing area 8 are e, the inclination angle of the funnel-shaped flow collecting groove 5 is α, and the number of small holes of each circle of the cylindrical small hole 4 is n.

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

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

[0028] The working principle of the present application is as follows: two solutions to be mixed flow into the cylindrical inlet I1 and the inlet II2 according to 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 on the uneven surface of the half golf ball structure 7, enters the secondary main mixing area through the spiral inclined hole I6 and generates vortex flow at the same time, finally, the mixed solution enters the cylindrical outlet channel 10 through the spiral inclined hole II9 and flows out.

[0029] The solution flows in the flow passage in normal useFig. 2 The arrow direction indicates the fluid flow path.

[0030] It should be noted that in the embodiments of the present application, all directional terms (such as inner, outer, bottom, etc.) are used only to explain a specific situation (as shown in the drawings) of the corresponding position relationship of each component, and when the situation changes, the corresponding directional terms also change, and when the position and state conform to the position described in the present application, it can be considered that it is within the protection scope of the present application, and it cannot be considered that a certain component of the present application is in a unique position, unless otherwise specified and limited, the terms "connected", "communicated" can be direct connection or indirect connection, and the "provided", "opened" can be directly provided or indirectly provided;

[0031] In the embodiment of the present application, only the structure related to the embodiment of the present application is involved, and other structures can be referred to the general design, and in the case of no conflict, the same embodiment and different embodiments of the present application can be combined with each other;

[0032] The above shows and describes the main features, working principle and advantages of the present application. The above embodiments and descriptions in the specification are only a preferred example of the present application, and are not used to limit the present application, and the present application can be improved and changed without departing from the scope and spirit of the present application, and these improvements and changes all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A telescopic two-stage hybrid three-dimensional structured micromixer, characterized in that, The micro-mixer is a three-dimensional structure, comprising two cylindrical inlets I (1) and II (2) 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 a cylindrical small hole (4) connecting the inner tube (11) and the primary main mixing zone (3); a funnel-shaped flow collection groove (5) is arranged at the center of the end of the primary main mixing zone, and the bottom is a half golf ball structure (7); the inlet and outlet of the secondary main mixing zone (8) are composed of spiral bevel holes I (6) and II (9) with the same size, the spiral bevel hole II (9) of the secondary main mixing zone (8) is connected with the cylindrical outlet channel (10), and the central axes of the cylindrical inlet I (1), the inner tube (11), the funnel-shaped flow collection groove (5), the half golf ball structure (7) and the cylindrical outlet channel (10) are collinear; the diameter of the cylindrical inlet I (1) is a, the diameter of the cylindrical inlet II (2) is b, the diameter of the cylindrical outlet channel (10) is c, the diameter of the cylindrical small hole (4) is d, the diameters of the spiral bevel holes I (6) and II (9) of the secondary main mixing zone (8) are e, and the inclination angle of the funnel-shaped flow collection groove (5) is α; the number of the cylindrical small hole (4) is m, and m is not less than 3; the number of small holes in each circle of the cylindrical small hole (4) is n, and 1≤n≤31; the diameter a of the cylindrical inlet I (1) is 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 diameters e of the spiral bevel holes I (6) and II (9) are equal to the diameter d of the cylindrical small hole (4); the diameter g of the half golf ball structure (7) is 0.5mm≤g≤1mm, and 10°≤α≤45°.

2. The telescopic two-stage hybrid three-dimensional structured micromixer according to claim 1, wherein: The diameter of the cylindrical inlet II (2) is b, and 0.1mm≤b≤1mm.

3. The telescopic two-stage hybrid three-dimensional structured micro- mixer of claim 1, wherein: The number of the spiral bevel holes I (6) and II (9) is f, and 1≤f≤10.

4. The telescopic two-stage hybrid three-dimensional structured micro- mixer of claim 1, wherein: The height of the spiral line of the spiral bevel holes I (6) and II (9) is H, and H=2.5mm; the pitch of the spiral line of the spiral bevel holes I (6) and II (9) is L, and L=4mm.

5. The telescopic two-stage hybrid three-dimensional structured micro- mixer of claim 1, wherein: The direction of the spiral line of the spiral bevel holes I (6) and II (9) is counterclockwise, and the initial angle of the spiral line of the spiral bevel holes I (6) and II (9) is S, and S=45°.

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