A microfluidic emulsification device for emulsion preparation

Abstract

The present invention relates to the technical field of emulsification and mixing, and specifically to a microfluidic emulsification device for preparing an emulsion, comprising a shell, a first microchannel, a second microchannel, an inlet and an outlet, wherein the first microchannel is arranged in the shell, the inlet is arranged on the shell and connected to one end of the first microchannel, the second microchannel is connected to one end of the first microchannel away from the inlet, the outlet is arranged on the shell and connected to one end of the second microchannel away from the first microchannel, the second microchannel is connected to one end of the first microchannel away from the inlet, and the outlet is arranged on the shell and connected to one end of the second microchannel away from the first microchannel. The present invention is provided with a spiral plate, and since the spiral rotation directions of the first spiral part and the second spiral part are opposite, after the material flows to the position of the second spiral part through the spiral guide of the first spiral part, the oil phase and the water phase in the material further collide and mix, so that the emulsification effect of the material is improved.

Description

Technical Field

[0001] The invention relates to the technical field of emulsification and mixing, in particular to a microfluidic emulsification device for preparing emulsion. Background Art

[0002] Microfluidic emulsification device is a device that uses microfluidic technology to emulsify liquids. In a microfluidic system, liquids flow through micron-scale channels or pores. These tiny structures can accurately control the mixing, dispersion and collision of fluids, thereby achieving a very efficient emulsification effect. Microfluidic emulsification technology can prepare emulsions with uniform particle size and high stability, such as nano-emulsions, which are widely used in technical fields such as cosmetics, food science and pharmaceuticals.

[0003] Most of the current microfluidic emulsification equipment is of the passive mixing type, which uses the change of the geometric dimensions of the flow channel to make the fluid continuously collide and disperse in the flow channel. For example, the Chinese utility model patent with the authorization announcement number CN211329433U discloses a microfluidic emulsification system. The utility model achieves the purpose of emulsification by changing the geometric dimensions of the microchannel to make the oil phase and the water phase collide and disperse in the microchannel. However, this solution still has the following problems: as the oil phase and the water phase flow forward along the microchannel, the kinetic energy of the collision between the oil phase and the water phase gradually decreases, which will cause the emulsification efficiency to decrease. Summary of the invention

[0004] Based on this, it is necessary to provide a microfluidic emulsification device for emulsion preparation to address the problems existing in the current microfluidic emulsification equipment, so as to solve the problem of low emulsification efficiency of the existing emulsification equipment.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A microfluidic emulsification device for preparing an emulsion comprises:

[0007] case;

[0008] A first microfluidic channel, the first microfluidic channel is arranged in the housing;

[0009] A feed inlet, which is provided on the housing and connected to one end of the first microchannel;

[0010] a second microchannel, the second microchannel being connected to an end of the first microchannel away from the feed inlet;

[0011] A discharge port, which is disposed on the housing and communicates with an end of the second microchannel away from the first microchannel;

[0012] The second microchannel is cylindrical, and end rings are provided at both ends of the second microchannel, and a spiral plate is provided between the two end rings;

[0013] The spiral plate comprises a first spiral part and a second spiral part, the first spiral part and the second spiral part are fixedly connected along the direction where the axis thereof is located, and the first spiral part and the second spiral part have opposite rotation directions;

[0014] The diameter of the spiral plate decreases in a step-like manner along the flow direction of the material.

[0015] In one embodiment, the first microchannel includes a main stream part and a branch stream part, the flow channel shape of the main stream part is Y-shaped, there are two inlets and they are connected with two flow channel feet of the main stream part, the flow channel head of the main stream part is connected with the second microchannel, there are multiple branch stream parts, the flow channel shape of the branch stream parts is arc-shaped, multiple branch stream parts are arranged on the main stream part at intervals, and both ends of the branch stream parts are connected to the main stream part.

[0016] In one embodiment, a plurality of mixing wheels are rotated in the second microfluidic channel, and the plurality of mixing wheels are divided into two groups. The two groups of mixing wheels are arranged along two sides of the spiral plate respectively, and a preset gap is left between two adjacent mixing wheels and the rotation directions of the two adjacent mixing wheels are opposite.

[0017] In one embodiment, the mixing wheel is in the shape of a polygonal star.

[0018] In one embodiment, a driving component is disposed in the second microchannel, and the driving component is used to drive the mixing wheel to rotate and make the rotation directions of two adjacent mixing wheels opposite.

[0019] In one embodiment, the driving assembly includes a rotating ring, a fixed ring and a gear column, there are multiple rotating rings, the multiple rotating rings are arranged at intervals on the outside of the second microfluidic channel along the axis of the second microfluidic channel, the rotating ring can rotate around its axis, one end of the rotating ring is provided with an annular groove inwardly, the bottom of the annular groove is provided with an annular gear disk, the fixed rings are arranged at intervals on the outside of the second microfluidic channel along the axis of the second microfluidic channel, and the fixed ring is located on the inner side of the rotating ring, the gear column is rotatably connected to the fixed ring and the gear column is meshed with the annular gear disk, and the other end of the gear column is fixedly connected to the mixing wheel;

[0020] Among three consecutive adjacent rotating rings, the annular groove on the middle rotating ring is opposite to the annular groove on one of the adjacent rotating rings, and is opposite to the annular groove on another adjacent rotating ring.

[0021] In one embodiment, annular positioning grooves are provided at intervals on the outer side of the second microfluidic channel and along the axis of the second microfluidic channel. The rotating ring is rotatably disposed in the annular positioning groove and away from the axis of the second microfluidic channel. The fixing ring is fixedly disposed in the annular positioning groove and close to the axis of the second microfluidic channel.

[0022] In one of the embodiments, a long ring groove is provided on the shell and located outside the annular positioning groove, an active magnetic ring is rotatably connected in the long ring groove, a passive magnetic ring is embedded in the rotating ring, and the active magnetic ring can drive the passive magnetic ring to rotate synchronously through magnetic attraction.

[0023] In one of the embodiments, the outer side of the active magnetic ring is evenly distributed with guide vanes in the circumferential direction, the upper surface of the shell is also provided with an air inlet, the air inlet is close to one end of the long ring groove and is connected to the long ring groove, and the upper surface of the shell is also provided with an air outlet, the air outlet is close to the other end of the long ring groove and is connected to the long ring groove;

[0024] Air with a preset pressure is blown into the long ring groove from the air inlet, and the active magnetic ring can be driven to rotate when the air passes through the guide vanes.

[0025] In one embodiment, the active magnetic ring, the rotating ring and the fixed ring are all connected by two semicircular rings.

[0026] The beneficial effects of the present invention are:

[0027] 1. The present invention is provided with a spiral plate. Since the spiral rotation directions of the first spiral part and the second spiral part are opposite, after the material flows to the position of the second spiral part through the spiral guide of the first spiral part, the oil phase and the water phase in the material further collide and mix, thereby improving the emulsification effect of the material.

[0028] 2. The present invention is provided with a spiral plate. Since the diameter of the spiral plate decreases in a step-like manner along the flow direction of the material, at the step position where the spiral plate changes diameter, part of the material in the large diameter area will collide with the material in the small diameter area under the action of gravity drop, thereby promoting the emulsification and mixing of the material.

[0029] 3. The present invention is provided with a spiral plate. Since the diameter of the spiral plate gradually decreases from the outside to the inside, the material is gradually squeezed from the outside to the inside during the forward flow, which is beneficial to the mixing of the oil phase and the water phase, so as to promote the emulsification mixing of the material and make the emulsification uniformity of the material better. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is an overall schematic diagram of a microfluidic emulsification device for preparing an emulsion according to the present invention;

[0031] Figure 2 A front view of a microfluidic emulsification device for preparing an emulsion according to the present invention;

[0032] Figure 3 for Figure 2 Middle AA section view;

[0033] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at X in the middle;

[0034] Figure 5 This is a structural diagram of a first microchannel and a second microchannel in a microfluidic emulsification device for preparing an emulsion according to the present invention;

[0035] Figure 6 for Figure 5 Schematic diagram of the enlarged structure at Y in the middle;

[0036] Figure 7 This is a schematic diagram of the structure of a spiral plate in a microfluidic emulsification device for preparing an emulsion according to the present invention;

[0037] Figure 8 This is a structural diagram of a rotating ring in a microfluidic emulsification device for preparing an emulsion according to the present invention;

[0038] Fig. 9 for Figure 8 Middle BB section view;

[0039] Fig.10 for Fig. 9 Schematic diagram of the enlarged structure at Z in the middle;

[0040] Fig.11 This is an exploded view of an active magnetic ring in a microfluidic emulsification device for preparing an emulsion according to the present invention;

[0041] Fig.12 for Fig.11 Schematic diagram of the enlarged structure at W in the middle.

[0042] in:

[0043] 100, shell; 110, feed inlet; 120, discharge port; 130, annular positioning groove; 140, long ring groove; 150, air inlet; 160, air outlet; 200, first microchannel; 210, main stream part; 220, branch stream part; 300, second microchannel; 310, end ring; 320, spiral plate; 321, first spiral part; 322, second spiral part; 330, mixing wheel; 400, driving assembly; 410, rotating ring; 411, annular groove; 4111, annular gear disk; 420, fixed ring; 430, gear column; 500, active magnetic ring; 600, guide vane. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0045] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] like Figure 1-Figure 12 As shown, a microfluidic emulsification device for preparing an emulsion includes a housing 100, a first microchannel 200, a second microchannel 300, an inlet 110 and an outlet 120, wherein the first microchannel 200 is arranged in the housing 100, the inlet 110 is opened on the housing 100 and communicates with one end of the first microchannel 200, the second microchannel 300 is connected to one end of the first microchannel 200 away from the inlet 110, and the outlet 120 is opened on the housing 100 and communicates with the second microchannel 300 away from the first microchannel At one end of 200, the second microchannel 300 is cylindrical, and end rings 310 are provided at both ends of the second microchannel 300. A spiral plate 320 is provided between the two end rings 310. The spiral plate 320 includes a first spiral portion 321 and a second spiral portion 322. The first spiral portion 321 and the second spiral portion 322 are fixedly connected along the direction of their axes. The first spiral portion 321 and the second spiral portion 322 have opposite rotation directions, and the diameter of the spiral plate 320 decreases in a step-like manner along the flow direction of the material.

[0048] When in use, the staff transports the oil phase and water phase of the material to be emulsified into the first microchannel 200 through the feed port 110. The material enters the second microchannel 300 after continuous collision and dispersion in the first microchannel 200. After entering the second microchannel 300, the material flows forward in a spiral under the guidance of the spiral plate 320. Since the spiral rotation directions of the first spiral part 321 and the second spiral part 322 are opposite, the material flows to the position of the second spiral part 322 through the spiral guidance of the first spiral part 321. The oil phase and water phase in the material are further The collision and mixing improves the emulsification effect of the material. Furthermore, since the diameter of the spiral plate 320 decreases in a step-like manner along the flow direction of the material, at the step position where the spiral plate 320 changes its diameter, part of the material in the large diameter area will collide with the material in the small diameter area under the action of gravity drop, thereby promoting the emulsification and mixing of the material. In addition, since the diameter of the spiral plate 320 gradually decreases from the outside to the inside, the material is gradually squeezed from the outside to the inside during the forward flow, which is beneficial to the mixing of the oil phase and the water phase, so as to promote the emulsification and mixing of the material, so as to make the emulsification uniformity of the material better.

[0049] It should be additionally explained that the material flowing out after emulsification and mixing in the second microchannel 300 is discharged outward from the discharge port 120 .

[0050] It should also be noted that there are multiple first microchannels 200 and second microchannels 300, and one first microchannel 200 and one second microchannel 300 form a group. Multiple groups of first microchannels 200 and second microchannels 300 are arranged at equal intervals around the circumference of the shell 100, so that the materials can be discharged outward after being collected from the discharge port 120.

[0051] In a further embodiment, Figure 1 and Figure 6 As shown, the first microchannel 200 includes a main stream portion 210 and a branch stream portion 220. The flow channel shape of the main stream portion 210 is Y-shaped. There are two inlets 110 and they are connected to the two flow channel feet of the main stream portion 210. The flow channel head of the main stream portion 210 is connected to the second microchannel 300. There are multiple branch stream portions 220. The flow channel shape of the branch stream portion 220 is arc-shaped. Multiple branch stream portions 220 are arranged on the main stream portion 210 at intervals, and both ends of the branch stream portions 220 are connected to the main stream portion 210.

[0052] There are two feed inlets 110, and the oil phase and the water phase are respectively injected into the first microchannel 200 from the two feed inlets 110. After the oil phase and the water phase enter the first microchannel 200, the oil phase and the water phase first flow forward along the main stream part 210 and mix. When the oil phase and the water phase flow to the location of the branch part 220, the oil phase and the water phase are diverted to the branch part 220. As the oil phase and the water phase flow forward, the oil phase and the water phase flow out from the branch part 220 and gather in the main stream part 210. As the oil phase and the water phase continue to flow forward, the oil phase and the water phase are continuously dispersed and mixed between the main stream part 210 and the branch part 220, so that the oil phase and the water phase complete preliminary mixing.

[0053] In a further embodiment, Figure 4 and Fig.12 As shown, a plurality of mixing wheels 330 are rotatably disposed in the second microfluidic channel 300. The plurality of mixing wheels 330 are divided into two groups. The two groups of mixing wheels 330 are arranged along two sides of the spiral plate 320, respectively. A preset gap is left between two adjacent mixing wheels 330, and the rotation directions of the two adjacent mixing wheels 330 are opposite.

[0054] Since the rotation directions of two adjacent mixing wheels 330 are opposite, the two adjacent mixing wheels 330 can cooperate with each other to guide the flow of materials. Therefore, during the flow of materials in the second microchannel 300, when the guiding direction of the spiral plate 320 for the material is the same as the guiding direction of the mixing wheel 330 for the material, the flow speed of the material increases. As the material continues to flow forward, the guiding direction of the spiral plate 320 for the material is opposite to the guiding direction of the mixing wheel 330 for the material. At this time, the flow of the material is hindered and the flow speed of the material is reduced. In this way, the material can flow at different speeds and spirally mix in the second microchannel 300, increasing the number of collisions and dispersions of the materials in the second microchannel 300 and the collision intensity, so as to promote the emulsification and mixing of the materials.

[0055] In a further embodiment, Fig.12 As shown, the mixing wheel 330 is in the shape of a polygonal star.

[0056] It can be understood that when the mixing wheel 330 is a polygonal star, the circumferential surface of the mixing wheel 330 is a curved surface, which can generate sufficient turbulence when the material flows in the gap of the mixing wheel 330, enhance the collision intensity of the material in the gap of the mixing wheel 330, and increase the number of collisions of the material at the mixing wheel 330, further improve the uniformity of material mixing, and improve the emulsification effect.

[0057] In a further embodiment, Figure 4 and Fig.10As shown, a driving assembly 400 is provided in the second microchannel 300, and the driving assembly 400 is used to drive the mixing wheel 330 to rotate, and make the rotation directions of two adjacent mixing wheels 330 opposite, the driving assembly 400 includes a rotating ring 410, a fixed ring 420 and a tooth column 430, there are multiple rotating rings 410, and the multiple rotating rings 410 are arranged at intervals along the axis of the second microchannel 300 on the outside of the second microchannel 300, and the rotating ring 410 can rotate around its axis, and an annular groove 411 is opened inwardly at one end of the rotating ring 410, and an annular toothed disc 4111 is opened at the bottom of the annular groove 411, and a fixed ring 420 is opened at the bottom of the annular groove 411. The rings 420 are arranged at intervals on the outside of the second microchannel 300 along the axis of the second microchannel 300, and the fixed ring 420 is located on the inside of the rotating ring 410. The tooth column 430 is rotatably connected to the fixed ring 420 and the tooth column 430 is meshed with the annular toothed disk 4111. The other end of the tooth column 430 is fixedly connected to the mixing wheel 330. For three consecutive adjacent rotating rings 410, the annular groove 411 on the middle rotating ring 410 is opposite to the annular groove 411 on an adjacent rotating ring 410, and is opposite to the annular groove 411 on another adjacent rotating ring 410.

[0058] When in use, the rotating ring 410 rotates around its axis, and the rotation of the rotating ring 410 causes the annular toothed disc 4111 to drive the tooth column 430 to rotate, and the tooth column 430 drives the mixing wheel 330 to rotate. Since the annular groove 411 on the middle rotating ring 410 of the three consecutive adjacent rotating rings 410 is opposite to the annular groove 411 on the adjacent rotating ring 410, and is opposite to the annular groove 411 on the other adjacent rotating ring 410, the rotation directions of the two adjacent mixing wheels 330 are opposite.

[0059] In a further embodiment, Figure 6 As shown, annular positioning grooves 130 are arranged at intervals on the outer side of the second microfluidic channel 300 and along the axis of the second microfluidic channel 300, a rotating ring 410 is rotatably arranged in the annular positioning groove 130 and away from the axis of the second microfluidic channel 300, and a fixed ring 420 is fixedly arranged in the annular positioning groove 130 and close to the axis of the second microfluidic channel 300.

[0060] An annular positioning groove 130 is provided to guide and limit the rotation of the rotating ring 410 and to fix the fixing ring 420 .

[0061] In a further embodiment, Figure 6 and Fig.11 As shown, a long ring groove 140 is provided on the shell 100 and located on the outer side of the annular positioning groove 130. An active magnetic ring 500 is rotatably connected in the long ring groove 140. A passive magnetic ring is embedded in the rotating ring 410. The active magnetic ring 500 can drive the passive magnetic ring to rotate synchronously through magnetic attraction.

[0062] The long annular groove 140 is provided for installing the active magnetic ring 500. During the emulsification and mixing process of the materials, the active magnetic ring 500 rotates around its axis, and the active magnetic ring 500 drives the rotating ring 410 to rotate synchronously through the passive magnetic ring.

[0063] In a further embodiment, Fig.11 As shown, the outer side of the active magnetic ring 500 is evenly distributed with guide vanes 600 in the circumferential direction, and the upper surface of the shell is also provided with an air inlet 150, which is close to one end of the long annular groove 140 and connected to the long annular groove 140. The upper surface of the shell is also provided with an air outlet 160, which is close to the other end of the long annular groove 140 and connected to the long annular groove 140. Air with a preset pressure is blown into the long annular groove 140 from the air inlet 150, and the active magnetic ring 500 can be driven to rotate when the air passes through the guide vanes 600.

[0064] During the process of emulsifying and mixing the materials, the staff allows air of preset pressure to continuously enter from the air inlet 150 and be discharged from the air outlet 160. In this process, the air drives the active magnetic ring 500 to rotate through the guide vane 600, so that the active magnetic ring 500 drives the main flow part 210 to rotate synchronously through the passive magnetic ring.

[0065] It can be understood that, in order to enable the air to push the active magnetic ring 500 to rotate through the guide vanes 600 when the air acts on the guide vanes 600 , specifically, the guide vanes 600 are inclined along the radial direction of the active magnetic ring 500 .

[0066] In a further embodiment, the active magnetic ring 500 , the rotating ring 410 , and the fixed ring 420 are all formed by connecting two semicircular rings.

[0067] This is done to facilitate the placement of the active magnetic ring 500 into the long annular groove 140 , and the installation of the rotating ring 410 and the fixed ring 420 into the annular positioning groove 130 .

[0068] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A microfluidic emulsification device for preparing an emulsion, characterized in that: include: case; A first microfluidic channel, the first microfluidic channel is arranged in the housing; A feed inlet, which is provided on the housing and connected to one end of the first microchannel; a second microchannel, the second microchannel being connected to an end of the first microchannel away from the feed inlet; A discharge port, which is disposed on the housing and communicates with an end of the second microchannel away from the first microchannel; The second microchannel is cylindrical, and end rings are provided at both ends of the second microchannel, and a spiral plate is provided between the two end rings; The spiral plate comprises a first spiral part and a second spiral part, the first spiral part and the second spiral part are fixedly connected along the direction where the axis thereof is located, and the first spiral part and the second spiral part have opposite rotation directions; The diameter of the spiral plate decreases in a step-like manner along the flow direction of the material.

2. A microfluidic emulsification device for preparing an emulsion according to claim 1, characterized in that: The first microchannel includes a main stream part and a branch stream part. The flow channel shape of the main stream part is Y-shaped. There are two inlets and they are connected with the two flow channel feet of the main stream part. The flow channel head of the main stream part is connected with the second microchannel. There are multiple branch stream parts. The flow channel shape of the branch stream parts is arc-shaped. Multiple branch stream parts are arranged on the main stream part at intervals, and both ends of the branch stream parts are connected to the main stream part.

3. A microfluidic emulsification device for preparing an emulsion according to claim 1, characterized in that: A plurality of mixing wheels are rotatably arranged in the second microchannel. The plurality of mixing wheels are divided into two groups. The two groups of mixing wheels are arranged along two sides of the spiral plate respectively. A preset gap is left between two adjacent mixing wheels and the rotation directions of the two adjacent mixing wheels are opposite.

4. A microfluidic emulsification device for preparing an emulsion according to claim 3, characterized in that: The mixing wheel is in the shape of a polygonal star.

5. A microfluidic emulsification device for preparing an emulsion according to claim 3, characterized in that: A driving assembly is arranged in the second microchannel, and the driving assembly is used to drive the mixing wheel to rotate and make the rotation directions of two adjacent mixing wheels opposite.

6. A microfluidic emulsification device for preparing an emulsion according to claim 5, characterized in that: The driving assembly includes a rotating ring, a fixed ring and a tooth column. There are multiple rotating rings, which are arranged at intervals on the outside of the second microfluidic channel along the axis of the second microfluidic channel. The rotating ring can rotate around its axis. An annular groove is provided inwardly at one end of the rotating ring, and an annular toothed disk is provided at the bottom of the annular groove. The fixed rings are arranged at intervals on the outside of the second microfluidic channel along the axis of the second microfluidic channel, and the fixed ring is located on the inner side of the rotating ring. The tooth column is rotatably connected to the fixed ring and meshes with the annular toothed disk. The other end of the tooth column is fixedly connected to the mixing wheel. Among three consecutive adjacent rotating rings, the annular groove on the middle rotating ring is opposite to the annular groove on one of the adjacent rotating rings, and is opposite to the annular groove on another adjacent rotating ring.

7. A microfluidic emulsification device for preparing an emulsion according to claim 6, characterized in that: Annular positioning grooves are arranged at intervals outside the second microchannel and along the axis of the second microchannel. The rotating ring is rotatably arranged in the annular positioning groove and away from the axis of the second microchannel. The fixing ring is fixedly arranged in the annular positioning groove and close to the axis of the second microchannel.

8. A microfluidic emulsification device for preparing an emulsion according to claim 6, characterized in that: A long ring groove is provided on the shell and outside the annular positioning groove. An active magnetic ring is rotatably connected in the long ring groove. A passive magnetic ring is embedded in the rotating ring. The active magnetic ring can drive the passive magnetic ring to rotate synchronously through magnetic attraction.

9. A microfluidic emulsification device for preparing an emulsion according to claim 8, characterized in that: The outer side of the active magnetic ring is evenly distributed with guide vanes in the circumferential direction, the upper surface of the shell is also provided with an air inlet, the air inlet is close to one end of the long ring groove and is connected to the long ring groove, and the upper surface of the shell is also provided with an air outlet, the air outlet is close to the other end of the long ring groove and is connected to the long ring groove; Air with a preset pressure is blown into the long ring groove from the air inlet, and the active magnetic ring can be driven to rotate when the air passes through the guide vanes.

10. A microfluidic emulsification device for preparing an emulsion according to claim 8, characterized in that: The active magnetic ring, the rotating ring and the fixed ring are all connected by two semicircular rings.

Images